CompTIA Linux+ XK005 (171Q).

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Question 1 of 171

A systems administrator pressed Ctrl+Z after starting a program using the command line, and the shell prompt was presented.
In order to go back to the program, which of the following commands can the administrator use?

Select one of the following:

Explanation

Question 2 of 171

A Linux administrator is alerted to a storage capacity issue on a server without a specific mount point or directory.
Which of the following commands would be MOST helpful for troubleshooting? (Choose two).

Select one or more of the following:

parted
df
mount
du
fdisk
dd
ls

Explanation

Question 3 of 171

A Linux administrator needs to resolve a service that has failed to start. The administrator runs the following command:

ls -l startup file

The following output is retorned

---------. root root 81k Sep 13 19:01 startupfile

Which of the following is MOST likely the issue?

Select one of the following:

The service does not have permissions to read write the startupfile.
The service startupfile size cannot be 81k.
The service startupfile cannot be owned by root.
The service startupfile should not be owned by the root group.

Explanation

Question 4 of 171

Users report that connections to a MariaDB service are being closed unexpectedly. A systems administrator troubleshoots the issue and finds the following message in /var/log/messages.

dbserver kernel: out of Memory: Killed process 1234 (mysqld) .

Which of the following is causing the connection issue?

Select one of the following:

The process mysqld is using too many semaphores.
The server is running out of file descriptors.
Something is starving the server resources.
The amount of RAM allocated to the server is too high.

Explanation

Question 5 of 171

A cloud engineer needs to launch a container named web-01 in background mode.
Which of the following commands will accomplish this task?

Select one of the following:

docker builder -f --name web-01 httpd
docker load --name web-01 httpd
docker ps -a --name web-01 httpd
docker run -d --name web-01 httpd

Explanation

Question 6 of 171

A Linux administrator is tasked with adding users to the system. However, the administrator wants to ensure ther users access will be disebled once the project is over.
The expiration date should be 2021-09-30.
Which of the following commands will accomplish this task?

Select one of the following:

sudo useradd -e 2021-09-30 Project_user
sudo useradd -c 2021-09-30 Project_user
sudo modinfo -F 2021-09-30 Project_user
sudo useradd -m -d 2021-09-30 Project_user

Explanation

Question 7 of 171

A systems administrator frequently connects to a remote host via SSH and a non-standard port. The system administrator would like to avoid passing the port parameter on the command line every time.
Which of the following files can be used to set a different port value for that host?

Select one of the following:

/etc/ssh/sshd_config
/etc/ssh/moduli
~/.ssh/config
~/.ssh/authorized_keys

Explanation

Question 8 of 171

A systems administrator installed a new software program on a Linux server. When the system administrator tries to run the program, the following message appears on the screen.

Hardware virtualization support is not available on this system.
Either is not present or disabled in the system's BIOS.

Which of the following commands will allow the system administrator to check whether the system supports virtualization?

Select one of the following:

dmidecode -s system-version
Iscpu
sysctl-a
cat /sys/device/system/cpu/possible

Explanation

Question 9 of 171

A Linux administrator needs to analyze a failing application that is running inside a container.
Which of the following commands allows the Linux administrator to enter the running container and analyze the logs that are stored inside?

Select one of the following:

docker run -ti app /bin/sh
podman exec -ti app /bin/sh
podman run -d app /bin/sh
docker exec -d app /bin/bash

Explanation

Question 10 of 171

A Linux administrator was asked to run a container with the httpd server inside. This container should be exposed at port 443 of a Linux host machine while it internally listens on port 8443.
Which of the following commands will accomplish this task?

Select one of the following:

podman run -d -p 443:8443 httpd
podman run -d -p 8443:443 httpd
podman run -d -e 443:8443 httpd
podman exec -p 8443:443 httpd

Explanation

Question 11 of 171

A systems administrator requires that all files that are created by the user named web have read-only permissions by the owner.
Which of the following commands will satisfy this requirement?

Select one of the following:

chown web:web /home/web
chmod -R 400 /home/web
echo "umask 377" >> /home/web/.bashrc
setfacl read /home/web

Explanation

Question 12 of 171

A Linux administrator has installed a web server, a database server, and a web application on a server. The web application should be active in order to render the web pages. After the administrator restarts the server, the website displays the following message in the browser. Error establishing a database connection. The Linux administrator reviews the following relevant output from the systemd init files:

[image]

The administrator needs to ensure that the database is available before the web application is started. Which of the following should the administrator add to the HTTP server .service file to accomplish this task?

Select one of the following:

TRIGGERS=mariadb.service
ONFAILURE=mariadb.service
WANTEDBY=mariadb.service
REQUIRES=mariadb.service

Explanation

Question 13 of 171

A systems administrator is notified that the mysqld process stopped unexpectedly.

The systems administrator issues the following command:
sudo grep -i -r 'out of memory' /var/log

The output of the command shows the following:
kernel: Out of memory: Kill process 9112 (mysqld) score 511 or sacrifice child.

Which of the following commands should the systems administrator execute NEXT to troubleshoot this issue? (Select two).

Select one or more of the following:

free -h
nc -v 127.0.0.1 3306
renice -15 $(pidof mysql)
lsblk
killall -15
vmstat -a 1 4

Explanation

Question 14 of 171

An administrator transferred a key for SSH authentication to a home directory on a remote server. The key file was moved to .ssh/authorized_keys location in order to establish SSH connection without password. However, the SSH command still asked for the password. Given the following ouput;

[image]

Which of the following commands would resolve the issue?

Select one of the following:

restorecon .ssh/authorized_keys
ssh_keygen -t rsa -o .ssh/authorized_keys
chown root:root .ssh/authorized keys
chmod 600 .ssh/authorized_keys

Explanation

Question 15 of 171

A Linux administrator is providing a new Nginx image from the registry to local cache. Which of the following commands would allow this to happen?

Select one of the following:

docker pull nginx
docker attach ngninx
docker commit nginx
docker import nginx

Explanation

Question 16 of 171

A new Linux systems administrator just generated a pair of SSH keys that should allow connection to the servers. Which of the following commands can be used to copy a key file to remote servers? (Choose two).

Select one or more of the following:

wget
ssh-keygen
ssh-keyscan
ssh-copy-id
ftpd
scp

Explanation

Question 17 of 171

A Linux engineer is setting the sticky bit on a directory called devops with 755 file permission. Which of the following commands will accomplish this task?

Select one of the following:

chown -s 755 devops
chown 1755 devops
chmod -s 755 devops
chmod 1755 devops

Explanation

Question 18 of 171

An administrator accidentally deleted the /boot/vmlinuz file and must resolve the issue before the server is rebooted. Which of the following commands should the administrator use to identify the correct version of this file?

Select one of the following:

rpm -qa | grep kernel, uname -a
yun -y update; shutdown -r now
cat /etc/centos-release; rpm -Uvh --nodeps
telinit 1; restorecon -Rv /boot

Explanation

Question 19 of 171

A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following ouput:

[image]

Given there is a single CPU in the server, which of the following is causing the slowness?

Select one of the following:

The system is running out of swap space.
The CPU is overloaded.
The memory is exhausted.
The processes are paging.

Explanation

Question 20 of 171

A Linux administrator wants to set the SUID of a file named dev_team.text with 744 access rights. Which of the following commands will achieve this goal?

Select one of the following:

chmod 4744 dev_team.txt
chmod 744 --seduid dev_team.txt
chmod -c 744 dev_team.txt
chmod -v 4744 --suid dev_team.txt

Explanation

Question 21 of 171

Which of the following commands will display the operating system?

Select one of the following:

uname -n
uname -s
uname -o
uname -m

Explanation

Question 22 of 171

A system administrator is tasked with installing GRUB on the legacy MBR of the SATA hard drive. Which of the following commands will help the administrator accomplish this task?

Select one of the following:

grub-install /dev/hda
grub-install /dev/sda
grub-install /dev/sr0
grub-install /dev/hd0,0

Explanation

Question 23 of 171

A systems administrator wants to test the route between IP address 10.0.2.15 and IP address 192.168.1.40. Which of the following commands will accomplish this task?

Select one of the following:

route -e get to 192.168.1.40 from 10.0.2.15
ip route get 192.163.1.40 from 10.0.2.15
ip route 192.169.1.40 to 10.0.2.15
route -n 192.168.1.40 from 10.0.2.15

Explanation

Question 24 of 171

A Linux administrator is tasked with creating resources using containerization. When deciding how to create this type of deployment, the administrator identifies some key features, including portability, high availability and scalability in production. Which of the following should the Linux administrator choose for the new design?

Select one of the following:

Docker
On-premises systems
Cloud-based systems
Kubernetes

Explanation

Question 25 of 171

A systems administrator made some unapproved changes prior to leaving the company. The newly hired administrator has been tasked whit revealing the system to a compliant state. Which of the following commands will list and remove the correspondent packages?

Select one of the following:

dnf list and dnf remove last
dnf remove and dnf check
dnf info and dnf upgrade
dnf history and dnf history undo last

Explanation

Question 26 of 171

Which of the following enables administrators to configure and enforce MFA on a Linux system?

Select one of the following:

Kerberos
SELinux
PAM
PKI

Explanation

Question 27 of 171

A cloud engineer needs to check the link status of a network interface named eth1 in a Linux server. Which of the following commands can help to achieve the goal?

Select one of the following:

ifconfig hw eth1
netstat -r eth1
ss -ti eth1
ip link show eth1

Explanation

Question 28 of 171

A Linux administrator has been tasked with installing the most recent versions of packages on a RPM-based OS. Which of the following commands will accomplish this task?

Select one of the following:

apt-get upgrade
rpm -a
yum updateinfo
dnf update
yum check-update

Explanation

Question 29 of 171

A systems administrator is tasked with mounting a USB drive on a system. The USB drive has a single partition, and it has been mapped by the system to the device /dev/sdb. Which of the following commands will mount the USB to /media/usb?

Select one of the following:

mount /dev/sdb1 /media/usb
mount /dev/sdb0 /media/usb
mount /dev/sdb /media/usb
mount -t usb /dev/sdb1 /media/usb

Explanation

Question 30 of 171

A Linux administrator created a new file system. Which of the following files must be updated to ensure the filesystem mounts at boot time?

Select one of the following:

/etc/sysctl
/etc/filesystems
/etc/fstab
/etc/nfsmount.conf

Explanation

Question 31 of 171

A system administrator is troubleshooting connectivity issues and trying to find out why a Linux server is not able to reach other servers on the same subnet it is connected to. When listing link parameters, the following is presented:

[image]

Based on the output above, which of following is the MOST probable cause of the issue?

Select one of the following:

The address ac:00:11:22:33:cd is not a valid Ethernet address.
The Ethernet broadcast address should be ac:00:11:22:33:ff instead.
The network interface eth0 is using an old kernel module.
The network interface cable is not connected to a switch.

Explanation

Question 32 of 171

A system administrator wants to be sure the sudo rules just added to /etc/sudoers are valid. Which of the following commands can be used for this task?

Select one of the following:

visudo -c
test -f /etc/sudoers
sudo vi check
cat /etc/sudoers | tee test

Explanation

Question 33 of 171

A systems administrator is tasked with setting up key-based SSH authentication. In which of the following locations should the administrator place the public keys for the server?

Select one of the following:

~/.ssh/authkeys
~/.ssh/keys
~/.ssh/authorized_keys
~/.ssh/keyauth

Explanation

Question 34 of 171

A systems administrator has been unable to terminate a process. Which of the following should the administrator use to forcibly stop the process?

Select one of the following:

kill -1
kill -3
kill -15
kill -HUP
kill -TERM

Explanation

Question 35 of 171

A junior Linux administrator is tasked with installing an application. The installation guide states the application should only be installed in a run level 5 environment.

$systemctl get-default
getty.target

Which of the following commands would ensure the server is set to run level 5?

Select one of the following:

systemctl isolate multi-user.target
systemctl isolate graphical.target
systemctl isolate network.target
systectl isolate basic.target

Explanation

Question 36 of 171

When trying to log in remotely to a server, a user receives the following message:

[image]

Which of the following is causing the issue?

Select one of the following:

The wrong permissions are on the user's home directory.
The account was locked out due to three failed logins.
The user entered the wrong password.
The user has the wrong shell assigned to the account.

Explanation

Question 37 of 171

Which of the following technologies provides load balancing, encryption, and obsiervability in containerized enviroments?

Select one of the following:

Virtual private network
Sidecar pod
Overlay network
Service mesh

Explanation

Question 38 of 171

At what point is the Internal Certificate Authority (ICA) created?

Select one of the following:

During the primary Security Management Server installation process.
Upon creation of a certificate.
When an administrator decides to create one.
When an administrator initially logs into SmartConsole.

Explanation

Question 39 of 171

A could engineer need to remove all dangling images and delete all the images that do not have and associated container. Which of the following commands will help to accomplish this task?

Select one of the following:

docker images prune -a
docker push images -a
docker rmi -a images
docker images rmi --all

Explanation

Question 40 of 171

A systems administrator is tasked with creating a cloud-based server with a public IP address.

The code is as follows:

[img]

Which of the following technologies did the systems administrator use to complete this task?

Select one of the following:

Puppet
Git
Ansible
Terraform

Explanation

Question 41 of 171

Employees in the finance department are having trouble accessing the file /opt/work/file. All IT employees can read and write the file. Systems administrator reviews the following output:

[img]

Which of the following commands would permanently fix the access issue while limiting access to IT and finance department employees?

Select one of the following:

chattr +i file
chown it:finance file
chmod 666 file
setfacl -m g:finance:rw file

Explanation

Question 42 of 171

A Linux administrator is reviewing changes to a configuration file that includes the following section:

[img]

The linux administrator is trying to select the appropiate syntax formatter to correct any issues with the configuration file. Which of the following should the syntax formatter support to meet this goal?

Select one of the following:

Markdown
XML
YAML
JSON

Explanation

Question 43 of 171

A Linux administrator is scheduling a system job that runs a script to check available disk space every hour. The Linux administrator does not want users to be able to start the job. Given the following:

[img]

Select one of the following:

The checkdiskspace.timer unit should be enabled via systemctl.
The timers.target should be reloaded to get the new configuration.
The checkdiskspace.timer should be configured to allow manual starts.
The checkdiskspace.timer should be started using the sudo command.

Explanation

Question 44 of 171

One leg of an LVM-mirrored volume failed due the underlying physical volume, and a systems administrator is troubleshooting the issue. The following ouput has been provided:

[img]

Select one of the following:

Reboot the srever. The volume will automatically go back to linear mode.
Replace the failed drive and reconfigure the mirror.
Reboot the server. The volume will revert to stripe mode.
Recreate the logical volume.

Explanation

Question 45 of 171

A Linux administrator recently downloaded a software package that is currently in a compressed file. Which of the following commands will extract the files?

Select one of the following:

unzip -v
bzip2 -z
gzip
funzip

Explanation

Question 46 of 171

A developer reported an incident involving the application configuration file /etc/httpd/conf/httpd.conf that is missing from the server. Which of the following identifies the RPM package that installed the configuration file?

Select one of the following:

rpm -qf /etc/httpd/conf/httpd.conf
rpm -ql /etc/httpd/conf/httpd.conf
rpm --query /etc/httpd/conf/httpd.conf
rpm -q /etc/httpd/conf/httpd.conf

Explanation

Question 47 of 171

A cloud engineer is installing packages during VM provisioning. Which of the following should the engineer use to accomplish this task?

Select one of the following:

Cloud-init
Bash
Docker
Sidecar

Explanation

Question 48 of 171

A user generated a pair of private-public keys on a workstation. Which of the following commands will allow the user to upload the public key to a remote server and enable passwordless login?

Select one of the following:

scp ~/.ssh/id_rsa user@server:~/
rsync ~/.ssh/ user@server:~/
ssh-add user server
ssh-copy-id user@server

Explanation

Question 49 of 171

A Linux administrator needs to ensure that Java 7 and Java 8 are both locally available for developers to use when deploying containers. Currently only Java 8 is available. Which of the following commands should the administrator run to ensure both versions are available?

Select one of the following:

docker image load java: 7
docker image pull java:7
docker image import java:7
docker image build java:7

Explanation

Question 50 of 171

A Linux administrator is troubleshooting SSH connection issues from one of the workstations.
When users attempt to log in from the workstation to a server with the IP address 104.21.75.76, they receive the following message:

ssh: connect to host 104.21.75.76 port 22: Connection refused.

The administrator reviews the information bellow:

[img]

Select one of the following:

The workstation has the wrong IP settings.
The sshd service is disabled.
The server's firewall is preventing connections from being made.
The server has an incorrect default gateway configuration.

Explanation

Question 51 of 171

A database administrator requested the installation of a custom database on one of the server. Which of the following should the Linux administrator configure so the requested packages can be installed?

Select one of the following:

/etc/yum.conf
/etc/ssh/sshd.conf
/etc/yum.repos.d/db.repo
/etc/resolv.conf

Explanation

Question 52 of 171

A Linux administrator has set up a new DNS forwarder and is configuring all internal servers to use the new forwarder to look up external DNS requests. The administrator needs to modify the firewall on the server for the DNS forwarder to allow the internal servers to communicate to it and make the changes persistent between server reboots. Which of the following commands should be run on the DNS forwarder server to accomplish this task?

Select one of the following:

ufw allow out dns
systemctl reload firewalld
iptables -A OUTPUT -p udp -m udp-dport 53 -j ACCEPT
firewall-cmd --zone=public --add-port=53/udp --permanent

Explanation

Question 53 of 171

A Linux administrator modified the SSH configuration file. Which of the following commands should be used to apply the configuration changes?

Select one of the following:

systemctl stop sshd
systemctl mask sshd
systemctl reload sshd
systemctl start sshd

Explanation

Question 54 of 171

A Linux administrator needs to create a new cloud.cpio archive containing all the files from the currently directory. Which of the following commands can help to accomplish this task?

Select one of the following:

ls | cpio -iv > cloud.epio
ls | cpio -iv < cloud.epio
ls | cpio -ov > cloud.cpio
ls cpio -ov < cloud.cpio

Explanation

Question 55 of 171

A Linux administrator is creating a primary partition on the replacement hard drive for an application server. Which of the following commands should the administrator issue to verify the device name of this partition?

Select one of the following:

sudo fdisk /dev/sda
sudo fdisk -s /dev/sda
sudo fdisk -l
sudo fdisk -h

Explanation

Question 56 of 171

Users have reported that the interactive sessions were lost on a Linux server. A Linux administrator verifies the server was switched to rescue .target mode for maintenance. Which of the following commands will restore the server to its usual target?

Select one of the following:

telinit 0
systemctl reboot
systenctl get-default
systemctl emergency

Explanation

Question 57 of 171

A Linux systems administrator is configuring a new filesystem that needs the capability to be mounted persistently across reboots. Which of the following commands will accomplish this task (Choose two).

Select one or more of the following:

df -h /data
mkfs.ext4 /dev/sdc1
fsck /dev/sdc1
fdisk -l /dev/sdc1
echo "/data/dev/sdc1 ext4 defaults 0 0" >> /etc/fstab
echo "/dev/sdc1 /data ext4 defaults 0 0" >> /etc/fstab

Explanation

Question 58 of 171

Which of the following tools is BEST suited to orchestrate a large number of containers across many different servers?

Select one of the following:

Kubernetes
Ansible
Podman
Terraform

Explanation

Question 59 of 171

A Linux engineer receives reports that files created within certain group are being modified by users who are not group members. The engineer wants to reconfigure the server so that only file owners and group members can modify new files by default. Which of the following commands would accomplish this task?

Select one of the following:

chmod 775
umask 002
chattr -Rv
chown -cf

Explanation

Question 60 of 171

An administrator attempts to rename a file on a server but receives the following error.

mv: cannot move 'files/readme.txt' to 'files/readme.txt.orig': Operation not permitted.

The administrator then runs a few commands and obtains the following output:

[img]

Which of the following commands should the administrator run NEXT to allow the file to be renamed by any user?

Select one of the following:

chgrp reet files
chacl -R 644 files
chown users files
chmod -t files

Explanation

Question 61 of 171

A Linux administrator would like to use the systemd to schedule a job to run every two hours. The administrator creates timer and services definition and restarts the server to load these new configurations. After the restart, the administrator checks the log file and notices that the job is only running daily. Which of the following is MOST likely causing the issue?

Select one of the following:

The checkdiskspace.service is not running.
The checkdiskspace.service needs to be enabled.
The OnCalendar schedule is incorrect in the timer definition.
The system-daemon services need to be reloaded.

Explanation

Question 62 of 171

After listing the propierties of a system account, a systems administrator wants to remove the expiration date of a user account. Which of the following commands will accomplish this task?

Select one of the following:

chgrp system accountname
passwd -s accountname
chmod -G system account name
change -E -1 accountname

Explanation

Question 63 of 171

A Linux system is getting an error indicating the root filesystem is full. Which of the following commads should be used by the systems administrator to resolve this issue? (Choose three).

Select one or more of the following:

df -h /
fdisk -1 /dev/sdb
growpart /dev/mapper/rootvg-rootlv
pvcreate /dev/sdb
lvresize -L +10G -r /dev/mapper/rootvg-rootlv
lsblk /dev/sda
parted -l /dev/mapper/rootvg-rootlv
vgextend /dev/rootvg /dev/sdb

Explanation

Question 64 of 171

A Linux administrator needs to create an imagen named sda.img from the sda disk and store it in the /tmp directory. Which of the following commands should be used to accomplish this task?

Select one of the following:

dd of=/dev/sda if=/tmp/sda.img
dd if=/dev/sda of=/tmp/sda.img
dd --if=/dev/sda --of=/tmp/sda.img
dd --of=/dev/sda --if=/tmp/sda.img

Explanation

Question 65 of 171

A systems technician is working on deploying several microservices to various RPM-based systems, some of which could run up to two hours. Which of the following commands will allow the technician to execute those services and continue deploying other microservices within the same terminal section?

Select one of the following:

gedit & disown
kill 9 %1
fg %1
bg %1 job name

Explanation

Question 66 of 171

A Linux administrator is adding a new configuration file to a Git repository. Which of the following describes the correct order of Git commands to accomplish the task successfully?

Select one of the following:

pull _> push _> add _> checkout
pull _> add _> commit _> push
checkout _> push _> add _> pull
pull _> add _> push _> commit

Explanation

Question 67 of 171

Users have been unable to reach www.comptia.org from a Linux server. A systems administrator is troubleshooting the issue and does the following:

[img]

Based on the information above, which of the following is causing the issue?

Select one of the following:

The name www.comptia.org does not point to a valid IP address.
The server 192.168.168.53 is unreachable.
No default route is set on the server.
The network interface eth0 is dissconected.

Explanation

Question 68 of 171

A systems administrator needs to reconfigure a Linux server to allow persistent IPv4 packet forwarding. Which of the following commands is the correct way to accomplish this task?

Select one of the following:

echo 1 > /proc/sys/net/ipv4/ipv_forward
sysctl -w net.ipv4.ip_forward=1
firewall-cmd --enable ipv4_forwarding
systemctl start ipv4_forwarding

Explanation

Question 69 of 171

A Linux administrator reviews a set of log output files and needs to identify files that contain any occurrence of the word denied. All logs files containing entries in uppercase or lowercase letters should be included in the list. Which of the following commands should the administrator use to accomplish this task?

Select one of the following:

find .-type f -print | xrags grep -In denied
find .-type f -print | xrags grep -nv denied
find .-type f -print | xrags grep -wL denied
find .-type f -print | xrags grep -li denied

Explanation

Question 70 of 171

A Linux user reported the following error after trying to connect to the system remotely:

ssh: connect to host 10.0.1.10 port 22: Resource temporarily unavailable.

The Linux system administrator executed the following commands in the Linux system while trying to diagnose the issue:

[img]

Which of the following commands will resolve this issue?

Select one of the following:

firewall-cmd --zone=public --permanent --add-service=22
systemctl enable firewalld; systemctl restart firewalld
firewall-cmd --zone=public --permanent -add-service=ssh
firewall-cmd --zone=public --permanent --add-port=22/udp

Explanation

Question 71 of 171

A cloud enginner need to block the IP address 192.168.10.50 from accessing a Linux server. Which of the following commands will achieve this goal?

Select one of the following:

iptables -F INPUT -j 192.168.10.50 -m DROP
iptables -A INPUT -s 192.168.10.30 -j DROP
iptables -i INPUT --ipv4 192.168.10.50 -z DROP
iptables -j INPUT 192.168.10.50 -p DROP

Explanation

Question 72 of 171

A junior administrator is trying to set up a passwordless SSH connection to one of the servers. The administrator follows the instructions and puts the key in the authorized_key file at the server, but the administrator is still asked to provide a password during the connection.

Given the following output:

[img]

Which

Select one of the following:

restorecon -rv .ssh/authorized_key
mv .ssh/authorized_key .ssh/authorized_keys
systemctl restart sshd.service
chmod 600 mv .ssh/authorized_key

Explanation

Question 73 of 171

A systems engineer is adding a new 1GB XFS filesystem that should be temporarily mounted under /ops/app. Which of the following is the correct list of commands to achieve this goal?

Select one of the following:

pvcreate -L1G /dev/app
mkfs.xfs /dev/app
mount /dev/app /opt/app
parted /dev/sdb --script mkpart primary xfs 1GB
mkfs.xfs /dev/sdb
mount /dev/sdb /opt/app
lvs --create 1G --name app
mkfs.xfs /dev/app
mount /dev/app /opt/app
lvcreate -L 1G -n app app_vq
mkfs.xfs /dev/app_vg/app
mount /dev/app_vg/app /opt/app

Explanation

Question 74 of 171

An administrator installed an application from source into/opt/operations1/ and has received numerous reports that users are not able to access the application without having to use the full path /opt/operations1/bin/*. Which of the following commands should be used to resolve this issue?

Select one of the following:

echo 'exportPATH=$PATH:/opt/operations1/bin' >> /etc/profile
echo 'exportPATH=/opt/operations1/bin' >> /etc/profile
echo 'exportPATH=$PATH/opt/operations1/bin' >> /etc/profile
echo 'export $PATH:/operations1/bin' >> /etc/profile

Explanation

Question 75 of 171

Which of the following files holds the system configuration for journal when running systemd?

Select one of the following:

/etc/systemd/journald.conf
/etc/systemd/systemd-journalctl.conf
/usr/lib/systemd/journalctl.conf
/etc/systemd/systemd-journald.conf

Explanation

Question 76 of 171

A junior systems administrator has just generated public and private authentication keys for passwordless login. Which of the following files will be moved to the remote servers?

Select one of the following:

id_dsa.pem
id_rsa
id_ecdsa
id_rsa.pub

Explanation

Question 77 of 171

A development team asks an engineer to guarantee the persistency of journal log files across system reboots. Which of the following commands would accomplish this task?

Select one of the following:

grep -i auto /etc/systemd/journald.conf && systemctl restart systemd-journald.service
cat /etc/systemd/journald.conf | awk '(print $1, $3)'
sed -i 's/auto/persistent/g' /etc/systemd/journald.conf && sed -i 'persistent/s/¨#//q' /etc/systemd/journald.conf
journalctl --list-boots && systemctl restart systemd-journald.service

Explanation

Question 78 of 171

A systems administrator is investigating why one of the servers has stopped connecting to the internet.

[img]

Which of the following is causing the issue?

Select one of the following:

The DNS address has been commented out in the configuration file.
The search entry in the /etc/resolv.conf file is incorrect.
Wired connection 1 is offline.
No default route is defined.

Explanation

Question 79 of 171

A Linux administrator is installing a web server and needs to check whether web traffic has already been allowed through the firewall. Which of the following commands should the administrator use to accomplish this task?

Select one of the following:

firewalld query-service-http
firewall-cmd --check-service http
firewall-cmd --query-service http
firewall --check-service http

Explanation

Question 80 of 171

A Linux administrator wants to find out whether files from the wget package have been altered since they were installed. Which of the following commands will provide the correct information?

Select one of the following:

rpm -i wget
rpm -qf wget
rpm -F wget
rpm -V wget

Explanation

Question 81 of 171

A Linux administrator is troubleshooting a memory-related issue. Based on the output of the commands.
[img]
Which of the following commands would address the issue?

Select one of the following:

top -p 8321
kill -9 8321
renice -10 8321
free 8321

Explanation

Question 82 of 171

A newly created container has been unable to start properly, and a Linux administrator is analyzing the cause of the failure. Which of the following will allow the administrator to determine the FIRST command that is executed inside the container right after it starts?

Select one of the following:

docker export <container_id>
docker info <container_id>
docker start <container_id>
docker inspect <container_id>

Explanation

Question 83 of 171

Using AD Query, the security gateway connections to the Active Directory Domain Controllers using what protocol?

Select one of the following:

Windows Management Instrumentation (WMI)
Hypertext Transfer Protocol Secure (HTTPS)
Lightweight Directory Access Protocol (LDAP)
Remote Desktop Protocol (RDP)

Explanation

Question 84 of 171

To harden one of the servers, and administrator needs to remove the possibility of remote administrative login via the SSH service. Which of the following should the administrator do?

Select one of the following:

Add the line DenyUsers root to the /etc/hosts.deny file.
Set PermitRootLogin to no in the /etc/ssh/sshd_config fie.
Add the line account required pam_nologin. so the /etc/pam.d/sshd file.
Set PubKeyAuthentication to no in the /etc/ssh/ssh_config file.

Explanation

Question 85 of 171

Some servers in an organization have been comprised. Users are unable to access to the organization's web page and other services. While reviewing the system log, a systems administrator notices messages from the kernel regarding firewall rules:

[img]

Wich of the following commands will remediate and help resolve the issue?

Select one of the following:

IPtables -A FORWARD -i eth0 -p tcp --dport 80 -j ACCEPT
IPtables -A FORWARD -i eth0 -p tcp --dport 22 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --dport 80 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --sport 80 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --sport 22 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --dport :80 -j ACCEPT
IPtables -A INPUT -i eth0 -p tcp --dport :22 -j ACCEPT

Explanation

Question 86 of 171

A systems administrator was tasked with assigning the temporary IP address/netmask 192.168.168.1/255.255.255.255 to the interface eth0 of a Linux server.
When adding the address, the following error appears:

#ip address add 192.168.168.1/33 dev eth0
Error: any valid prefix is expected rather than "192.168.168.1.33".

Based on the command and its output above, which of the following is the cause of the issue?

Select one of the following:

The CIDR value /33 should be /32 instead.
There is no route to 192.168.168.1/33.
The interface eth0 does not exist.
The IP address 192.168.168.1 is already in use.

Explanation

Question 87 of 171

A Linux administrator needs to create a new user named user02. However, user02 must be in a different home directory, which is under /comptia/projects. Which of the following commands will accomplish this task?

Select one of the following:

useradd -d /comptia/projects user02
useradd -m /comptia/projects user02
useradd -b /comptia/projects user02
useradd -s /comptia/projects user02

Explanation

Question 88 of 171

An administrator deployed a Linux server that is running a web application on port 6379/tcp.
SELinux is in enforcing mode based an organization policies.
The port is open on the firewall.
Users who are trying to connect to a local instance of the web application receive Error 13, Permission denied.

The administrator ran some commands that resulted in the following ouput:

[img]

Which of the following commands should be used to resolve the issue?

Select one of the following:

semanage port -d -t http_port_t -p tcp 6379
semanage port -a -t http_port_t -p tcp 6379
semanage port -a http_port_t -p top 6379
semanage port -I -t http_port_tcp 6379

Explanation

Question 89 of 171

Which of the following commands is used to configure the default permissions for new files?

Select one of the following:

setenforce
sudo
umask
chmod

Explanation

Question 90 of 171

Developers have requested implementation of a persistent, static route on the application server. Packets sent over the interface eth0 to 10.0.213.5/32 should be routed via 10.0.5.1. Which of the following commands should the administrator run to achieve this goal?

Select one of the following:

route -i etho -p add 10.0.213.5 10.0.5.1
route modify eth0 +ipv4.routes "10.0.213.5/32 10.0.5.1"
echo "10.0.213.5 10.0.5.1 eth0" > /proc/net/route
ip route add 10.0.213.5/32 via 10.0.5.1 dev eth0

Explanation

Question 91 of 171

An administrator needs to make some changes in the laC declaration templates. Which of the following commands would maintain version control?

Select one of the following:

git clone https://github.com/comptia/linux+-.git
git push origin
git clone https://github.com/comptia/linux+-.git
git fetch New-Branch
git clone https://github.com/comptia/linux+-.git
git status
git clone https://github.com/comptia/linux+-.git
git checkout -b <new-branch>

Explanation

Question 92 of 171

Based on a organization's new cybersecurity policies, an administrator has been instructed to ensure that, by default, all new users and groups that are created fall within the specified values below.

[img]

To which of the following configuration files will the required changes needs to be made?

Select one of the following:

/etc/login.defs
/etc/security/limits.conf
/etc/default/useradd
/etc/profile

Explanation

Question 93 of 171

A user is asking the systems administrator for assistance with writing a script to verify whether a file exists. Give the following:

[img]

Which of the following commands should replace the <CONDITIONAL> string?

Select one of the following:

if [-f "$filename"]; then
if [-d "$filename"]; then
if [-f "$filename"] then
if [-f "$filename"]; while

Explanation

Question 94 of 171

A systems administrator is receiving tickets from users who cannot reach the application app that should be listening on port 9443/tcp on a Linux server.

To troubleoshoot the issue, the system administrator runs netstat and receives the following output.

#netstat -anp | grep appd | grep -w LISTEN
tcp 0 0 127.0.0.1:9443 0:0:0:0:* LISTEN 1234/appd

Based on the information above, which of the following is causing the issue?

Select one of the following:

The IP address 0.0.0.0 is not valid.
The application is listening on the loopback interface.
The application is listening on port 1234.
The application is not running.

Explanation

Question 95 of 171

A junior administrator is setting up a new Linux server that is intended to be a used as a router at a remote site. Which of the following parameters will accomplish this goal?

Select one of the following:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -i eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -o eth0 -j MASQUERADE

Explanation

Question 96 of 171

A Linux administrator is troubleshooting an issue in which an application service failed to start on a Linux server. The administrator runs a few commands and gets the following ouputs:

[img]

Based on the above ouputs, which of the following is the MOST likely action the administrator should take to resolve this issue?

Based

Select one of the following:

Enable the logsearch.service and restart the service.
Increase the TimeoutStartUSec configuration for the logsearch.service
Update the OnCalendar configuration to schedule the start of the logsearch.service.
Update the KillSignal configuration for the logsearch.service to use TERM.

Explanation

Question 97 of 171

A Linux enginner has been notified about the possible deletion of logs from the file /opt/app/logs. The enginner needs to ensure the log file can only be written into without removing previous entries.

#lsattz /opt/app/logs
------------------e--- logs

Which of the following commands would be BEST to use to accomplish this task?

Select one of the following:

chattr +a /opt/app/logs
chattr +d /opt/app/logs
chattr +i /opt/app/logs
chattr +c /opt/app/logs

Explanation

Question 98 of 171

A Linux administrator needs to connect securely to a remote server in order to install application software. Which of the following commands would allow this connection?

Select one of the following:

scp "ABC-key.pem" root@10.0.0.1
sftp root@10.0.0.1
telnet 10.0.0.1 80
ssh -i "ABC-key.perm" root@10.0.0.1
sftp "ABC-key.perm" root@10.0.0.1

Explanation

Question 99 of 171

A Linux systems administrator is setting up a new web server and getting 404 -NOT FOUND errors while trying to access the web server pages from the browser. While working on the diagnosis of this issue, the Linux system administrator executes the following commands:

[img]

Which of the following commands will BEST resolve this issue?

Select one of the following:

sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
restorecon -R -v /var/www/html
setenforce 0
setsebool -P hhtpd_can_network_connect_db on

Explanation

Question 100 of 171

After installing some RPM packages, a systems administrator discovers the last package that was installed was not needed. Which of the following commands can be used to remove the package?

Select one of the following:

dnf remove packagename
apt-get remove packagename
rpm -i packagename
apt remove packagename

Explanation

Question 101 of 171

A systems administrator has been tasked with disabling the nginx service from the environment to prevent it from being automatically and manually started. Which of the following commands will accomplish this task?

Select one of the following:

systemctl cancel nginx
systemctl disable ngninx
systemctl mask nginx
systemctl stop nginx

Explanation

Question 102 of 171

An administrator is trying to diagnose a performance issue and is reviewing the following output:

[img]

Based on the above ouput, which of the following BEST describes the root cause?

Select one of the following:

The system has reached its maximum IOPS, causing the system to be slow.
The system has reached its maximum permitted throughput, therefore iowait is increasing.
The system is motly idle, therefore the iowait is high.
The system has a partitioned disk, which cuases the IOPS to be doubled.

Explanation

Question 103 of 171

Severals users reported that they were unable to write data to the /oracle1 directory. The following ouput has been provided.

[img]

Which of the following commands should the administrator use to diagnose the issue?

Select one of the following:

df -i /oracle1
fdisk -1 /dev/sdb1
lsblk /dev/sdb1
du -sh /oracle1

Explanation

Question 104 of 171

A Linux administrator needs to correct the permissions of a log file on the server. Which of the following commands should be used to set filename.log permissions to -rwxr--r--.?

Select one of the following:

chmod 755 filename.log
chmod 640 filename.log
chmod 740 filename.log
chmod 744 filename.log

Explanation

Question 105 of 171

A Linux administrator cloned an existing Linux server and built a new server from that clone. The administrator encountered the following error after booting the cloned server.

Device mismatch detected.

The administrator performed the commands listen below to further troubleshoot and mount the missing filesystem:

[img]

Which of the following should administrator use to resolve the device mismatch issue and mount the disk?
Which of the following

Select one of the following:

mount disk by device-id
fsck -A
mount disk by-label
mount disk by-blkid

Explanation

Question 106 of 171

A Linux engineer set up two local DNS server (10.10.10.10 and 10.10.10.20) and was testing email connectivity to the local mail server using the mail command on a local machine when the following error appeared:

Send-mail: Cannot open mail:25

The local machine DNS settings are:

[img]

Which of the following commands could the engineer use to query the DNS server to get mail server information?

Select one of the following:

dig@example.com 10.10.10.20 a
dig@10.10.10.20 example.com.mx
dig@example.com 10.10.10.20 ptr
dig@10.10.10.20 example.com ns

Explanation

Question 107 of 171

A developer has been unable to remove a particular data folder that a team no longer uses. The developer escalated the issue to the systems administrator. The following ouput was received:

[img]

Which of the following commands can be used to resolve this issue?

Select one of the following:

chgrp -R 755 data/
chmod -R 777 data/
chattr -R -i data/
chown -R data/

Explanation

Question 108 of 171

A systems administrator made some changes in the ~/.bashrc file and added an alias command. When the administrator tried to use the alias command, it did not work. Which of the following should be executed FIRST?

Select one of the following:

source ~/.bashrc
read ~./bashrc
touch ~./bashrc
echo ~./bashrc

Explanation

Question 109 of 171

A system administrator needs to clone the partition /dev/sdc1 to /dev/sdd1. Which of the following commands will accomplish this task?

Select one of the following:

tar -cvzf /dev/sdd1 /dev/sdc1
rsync /dev/sdc1 /dev/sdd1
dd if=/dev/sdc1 of=/dev/sdd1
scp /dev/sdc1 /dev/sdd1

Explanation

Question 110 of 171

A Linux engineer needs to create a custom script, cleanup.sh, to run a boot as part of the system services. Which of the following processes would accomplish this task?

Select one of the following:

Create a unit file in the /etc/default/ directory.
systemctl enable cleanup
systemctl is-enabled cleanup
Create a unit file in the /etc/ske1/directory.
systemctl enable cleanup
systemctl is-enable cleanup
Create a unit file in the /etc/systemd/system/ directory.
systemctl enable cleanup
systemctl is-enable cleanup
Create a unit file in the /etc/sysctl.d/ directory.
systemctl enable cleanup
systemctl is-enable cleanup

Explanation

Question 111 of 171

A new file was added to a main Git repository. An administrator wants to synchronize a local copy with the contents of the main repository. Which of the following commands should the administrator use for this task?

Select one of the following:

git reflog
git pull
git status
git push

Explanation

Question 112 of 171

A Linux systems administrator receives reports from various users that an application hosted on a server has stopped responding at similar times for several days in a row. The administrator logs in to the system and obtains the following ouput:

[img]

Which of the following should the administrator do to provide the BEST solution for the reported issue?

Select one of the following:

Configure memory allocation policies during business hours and prevent the Java process from going into a zombie state while the server is idle.
Configure a different nice value for the Java process to allow for more users and prevent the Java process from restarting during business hours.
Configure more CPU core to allow for the server to allocate more processing and prevent the Java process from consuming all of the available resources.
Configure the swap space to allow for spikes in usage during peak hours and prevent the Java process from stopping due to a lack of memory.

Explanation

Question 113 of 171

A systems administrator is deploying three identical, cloud-based servers. The administrator is using the following code to complete the task:

[img]

Which of the following technologies is the administrator using?

Select one of the following:

Ansible
Puppet
Chef
Terraform

Explanation

Question 114 of 171

User1 is a member of the accounting group. Members of this group need to be able to execute but not make changes to a script maintained by User2. The script should not be accessible to other users or groups. Which of the following will give propper access to the script?

Select one of the following:

chown user2:accounting script.sh
chmod 750 script.sh
chown user1:accounting script.sh
chmod 777 script.sh
chown accounting:user1 script.sh
chmod 057 script.sh
chown user2:accounting script.sh
chmod u+x script.sh

Explanation

Question 115 of 171

A systems administrator is tasked with preventing logins from accounts other than root, while the file /etc/nologin exists. Which of the following PAM modules will accomplish this task?

Select one of the following:

pam_login.so
pam_access.so
pam_logindef.so
pam_nologin.so

Explanation

Question 116 of 171

A systems administrator is compiling a report containing information about processes that are listening on the network ports of a Linux server. Which of the following commands will allow the administrator to obtain the needed information?

Select one of the following:

ss -plnt
tcpdump -nL
netstat -pn
lsof -lt

Explanation

Question 117 of 171

What is the main objective when using Application Control?

Select one of the following:

To filter out specific content.
To assist the firewall blade with handling traffic.
To see what users are doing.
Ensure security and privacy of information.

Explanation

Question 118 of 171

A Linux system administrator receives a notification that one of the server's filesystem is full. Which of the following commands would help the administrator to identify this filesystem?

Select one of the following:

lsblk
fdisk
df -h
du -ah

Explanation

Question 119 of 171

A cloud engineer needs to change the secure remote login port from 22 to 49000. Which of the following files should the engineer modify to change the port number to the desired value?

Select one of the following:

/etc/host.conf
/etc/hostname
/etc/services
/etc/ssh/sshd_config

Explanation

Question 120 of 171

A developer is trying to install an application remotly that requires a graphical interface for installation. The developer requested assistance to set up the necessary environment variables along with X11 forwarding in SSH. Which of the following environment variables must be set in remote shell in order to launch the graphical interface?

Select one of the following:

$RHOST
SETENV
$SHELL
$DISPLAY

Explanation

Question 121 of 171

Which of the following technologies can be used as a central repository of Linux users and groups?

Select one of the following:

LDAP
MFA
SSO
PAM

Explanation

Question 122 of 171

A systems administrator created a web server for the company and is required to add a tag for the API so end users can connect. Which of the following would the administrator do to complete this requirement?

Select one of the following:

hostnamectl status --no-ask-password
hostnamectl set-hostname "$(perl -le "print" "A" x86)"
hostnamectl set-hostname Comptia-WebNode -H root@192.168.2.14
hostnamectl set-hostname Comptia-WebNode --transient

Explanation

Question 123 of 171

A Linux administrator needs to determine whether a hostname is in the DNS. Which of the following would supply the information that is needed?

Select one of the following:

nslookup
rsync
netstat
host

Explanation

Question 124 of 171

A systems administrator wants to back up the directory /data and all its contents to /backup/data on a remote server named remote. Which of the following commands will achieve the desired effect?

Select one of the following:

scp -p /data remote:/backup/data
ssh -i /remote:/backup/ /data
rsync -a /data remote:/backup/
cp -r /data/remote/backup

Explanation

Question 125 of 171

A systems administrator received a notification that a system is performing slowly. When running the top command, the systems administrator can see the following values:

[img]

Which of the following commands will the administrator most likely run NEXT?

Select one of the following:

vmstat
strace
htop
lsof

Explanation

Question 126 of 171

A Linux administrator is troubleshooting the root cause of a high CPU load and average.

[img]

Which of the following commands will permanently resolve the issue?

Select one of the following:

renice -n -20 6295
pstree -p 6295
iostat -cy 1 5
kill -9 6295

Explanation

Question 127 of 171

A Linux systems administrator needs to persistently enable IPv4 forwarding in one of the Linux systems. Which of the following commands can be used together to accomplish this task? (Choose two.)

Select one or more of the following:

sysctl net.ipv4.ip_forward
sysctl -w net.ipv4.ip_forward=1
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
echo 1 > /proc/sys/net/ipv4/ip_forward
sysctl -p
echo "net.ipv6.conf.all.forwarding=l" >> /etc/sysctl.conf

Explanation

Question 128 of 171

A Linux administrator is trying to remove the ACL from the file /home/user/data.txt but receives the following error message:

setfacl: data.txt: operation not permitted

Given the following analysis:

[img]

Which of the following is causing the error message?

Select one of the following:

The administrator is not using a highly privileged account.
The filesystem is mounted with the wrong options.
SELinux file context is denying the ACL changes.
File attributes are preventing file modification.

Explanation

Question 129 of 171

Which of the following tools is commonly used for creating CI/CD pipelines?

Select one of the following:

Chef
Puppet
Jenkins
Ansible

Explanation

Question 130 of 171

A Linux administrator needs to obtain a list of all volumes that are part of a volume group. Which of the following commands should the administrator use to accomplish this task?

Select one of the following:

vgs
lvs
fdisk -1
pvs

Explanation

Question 131 of 171

A DevOps engineer needs to download a Git repository from https://git.company.com/admin/project.git. Which of the following commands will achieve this goal?

Select one of the following:

git clone https://git.company.com/admin/project.git
git checkout https://git.company.com/admin/project.git
git pull https://git.company.com/admin/project.git
git branch https://git.company.com/admin/project.git

Explanation

Question 132 of 171

A Linux system fails to start and delievers the following error message:

[img]

Which of the following commands can be used to address this issue?

Select one of the following:

fsck.ext4 /dev/sda1
partprobe /dev/sda1
fdisk /dev/sda1
mkfs.ext4 /dev/sda1

Explanation

Question 133 of 171

A Linux administrator rebooted a server. Users then reported some of their files were missing. After doing some troubleshooting, the administrator found one of the filesystem was missing. The filesystem was not listed in /etc/fstab and might have been mounted manually by someone prior the reboot. Which of the following would prevent this issue from reoccurring in the future?

Select one of the following:

Sync the mounts units.
Mount the filesystem manually.
Create a mount unit and enable it to be started at boot.
Remount all the missing filesystems.

Explanation

Question 134 of 171

A Linux engineer needs to download a ZIP file and wants to set the nice value to -10 for this new process. Which of the following commands will help to accomplish the task?

Select one of the following:

nice -v -10 wget https://foo.com/installation.zip
renice -v -10 wget https://foo.com/installation.zip
renice -10 wget https://foo.com/installation.zip
nice -10 wget https://foo.com/installation.zip

Explanation

Question 135 of 171

A systems administrator needs to check if the service systemd-resolved.service is running without any errors. Which of the following commands will show this information?

Select one of the following:

systemctl status systemd-resolved.service
systemctl enable systemd-resolved.service
systemctl mask systemd-resolved.service
systemctl show system

Explanation

Question 136 of 171

A Linux administrator needs to expand a volume group using a new disk. Which of the following options presents the correct sequence of commands to accomplish the task?

Select one of the following:

partprobe
vpcreate
lvextend
lvcreate
fdisk
partprobe
fdisk
partprobe
mkfs
fdisk
pvcreate
vgextend

Explanation

Question 137 of 171

A Linux system is failing to start due to issues with several critical system processes. Which of the following options can be used to boot the system into the single user mode? (Choose two).

Select one or more of the following:

Execute the following command from the GRUB rescue shell: mount -o remount, ro/sysroot.
Interrupt the boot process in the GRUB menu and add systemd.unit=single in the kernel line.
Interrupt the boot process in the GRUB menu and add systemd.unit=rescue.target in the kernel line.
Interrupt the boot process in the GRUB menu and add single=user in the kernel line.
Interrupt the boot process in the GRUB menu and add init=/bin/bash in the kernel line.
Interrupt the boot process in the GRUB menu and add systemd.unit=single.target in the kernel line.

Explanation

Question 138 of 171

Junior system administrator had trouble installing and running an Apache web server on a Linux server. You have been tasked with installing the Apache web server on the Linux server and resolving the issue that prevented the junior administrator from running Apache.

INSTRUCTIONS
Install Apache and start the service. Verify that the Apache service is running with the defaults.
Typing "help" in the terminal will show a list of relevant event commands.

If any time would like to bring back the initial state of the simulation, please click the Reset All button.

❌
systemctl --now enable httpd
systemctl status httpd
netstat -tunlp | grep 80
pkill <processname>
systemctl restart httpd
systemctl status httpd

Drag and drop to complete the text.

yum install httpd

systemctl --now enable httpd

(check 1) systemctl status httpd

netstat -tunlp | grep 80

pkill

systemctl restart httpd

(check2) systemctl status httpd

Explanation

Question 139 of 171

A Linux systems administrator needs to copy files and directories from Server A to Server B. Which of the following commands can be used for this purpose? (Choose two).

Select one or more of the following:

rsyslog
cp
rsync
reposync
scp
ssh

Explanation

Question 140 of 171

Rugged appliances are small appliances with ruggedized hardware and like Quantum Spark appliance they use which operating system?

Select one of the following:

Centos Linux
Gaia embedded
Gaia
Red Hat Enterprise Linux version 5

Explanation

Question 141 of 171

As a System Administrator, to reduce disk space, you were tasked to create a shell script that does the following:
Add a relevant content to /tmp/script.sh, so that it finds and compresses related files in /var/log/ without recursion.

INTRUCTIONS
Drag and drop snippets to fill the blanks to build a script that performs the actual compression of rotated log files.

If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

Drag an answer into the correct orange point.

egrep

"$log.[1-6]$"

"log.[1-6]$"

for

while

repeat

then

/tmp/tempfile

/var/log

filename

gzip

rar

tar

awk

done

until

Explanation

Question 142 of 171

A systems administrator needs to verify whether the built container has the app.go file in its root directory. Which of the following can the administrator use to verify the root directory has this file?

Select one of the following:

docker image inspect
docker container inspect
docker exec <container_name> ls
docker ps <container_name>

Explanation

Question 143 of 171

A DevOps engineer needs to allow incoming traffic to ports in the range of 4000 to 5000 on a Linux server. Which of the following commands will enforce this rule?

Select one of the following:

iptables -f filter -l INPUT -p tcp --dport 4000:5000 -A ACCEPT
iptables -t filter -A INPUT -p tcp --dport 4000:5000 j ACCEPT
iptables filer -A INPUT -p tcp --dport 4000:5000 -D ACCEPT
iptables filter -S INPUT -p tcp --dport 4000:5000 -A ACCEPT

Explanation

Question 144 of 171

Which of the following data structure is written in JSON?

Select one of the following:

---
name: user1
position: DevOps
floor: 3
<table>
<thbody><tr>
<td>user1</td>
<td>DevOps</td>
<td>3</td>
</tr>
</tbody></table>
<root>
<floor>3</floor>
<name>user1</name>
<position>DevOps</position>
</root>
{
"name": "user1",
"job": "DevOps",
"floor":3
}

Explanation

Question 145 of 171

Which of the following directories is the mount point in a UEFI system?

Select one of the following:

/sys/efi
/boot/efi
/efi
/etc/efi

Explanation

Question 146 of 171

A Linux administrator needs to remove software from the server. Which of the following RPM options should be used?

Select one of the following:

rpm -s
rpm -d
rpm -q
rpm -e

Explanation

Question 147 of 171

In which of the following filesystems are system logs commonly stored?

Select one of the following:

/var
/tmp
/etc
/opt

Explanation

Question 148 of 171

Which of the following is a function of a bootloader?

Select one of the following:

It initializes all the devices that are required to load the OS.
It mounts the root filesystem that is required to load the OS.
It helps to load the different kernels to initiate the OS startup process.
It triggers the start of all the system services.

Explanation

Question 149 of 171

A Linux administrator has logged in to a server for the first time and needs to know which services are allowed through the firewall. Which of the following options will return the results for which the administrator is looking?

Select one of the following:

firewall-cmd --get-services
firewall-cmd --check-config
firewall-cmd --list-services
systemctl status firewalld

Explanation

Question 150 of 171

A systems administrator is checking the system logs. The administrator wants to look at the last 20 lines of a log. Which of the following will execute the command?

Select one of the following:

tail -v 20
tail -n 20
tail -c 20
tail -l 20

Explanation

Question 151 of 171

A systems administrator created a new Docker image called test. After building the image, the administrator forgot to version the release. Which of the following will allow the administrator to assign the v1 version to the image?

Select one of the following:

docker image save test test:v1
docker image build test:vl
docker image tag test test:vl
docker image version test:v1

Explanation

Question 152 of 171

A Linux administrator copied a Git repository locally, created a feature branch, and commited some changes to the feature branch. Which of the following Git actions should the Linux administrator use to publish the changes to the main brach of the remote repository?

Select one of the following:

rebase
tag
commit
push

Explanation

Question 153 of 171

A Linux system is failing to boot with the following error:

error: no such partitions
Entering rescue mode...
grub rescue>

Which of the following actions will resolve this issue? (Choose two).

Select one or more of the following:

Execute grub-install --root-directory=/mnt and reboot.
Execute grub-install /dev/sdX and reboot.
Interrupt the boot process in the GRUB menu and add rescue to the kernel line.
Fix the partition modifying /etc/default/grub and reboot.
Interrupt the boot process in the GRUB menu and add single to the kernel line.
Boot the system on a LiveCD/ISO.

Explanation

Question 154 of 171

A Linux administrator needs to redirect all HTTP traffic temporarily to the new proxy server 192.0.2.25 on port 3128. Which of the following commands will accomplish this task?

Select one of the following:

iptables -t nat -D PREROUTING -p tcp --sport 80 -j DNAT --to-destination 192.0.2.25:3128
iptables -t nat -A PREROUTING -p top -dport 81 -j DNAT --to-destination 192.0.2.25:3129
iptables -t nat -I PREROUTING -p top --sport 80 -j DNAT --to-destination 192.0.2.25:3129
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination 192.0.2.25:3128

Explanation

Question 155 of 171

Due to low disk space, a Linux administrator finding and removing all log files that were modified more than 180 days ago. Which of the following commands will accomplish this task?

Select one of the following:

find /var/log -type d -mtime +180 -print -exec rm{}/;
find /var/log -type f -modified +180 -rm
find /var/log -type f -mtime +180 -exec rm {} /
find /var/log -type c -atime +180 -remove

Explanation

Question 156 of 171

A cloud engineer is asked to copy the file deployment.yaml from a container to the host where the container is running. Which of the following commands can accomplish this task?

Select one of the following:

docker cp container_id/deployment.yaml deployment.yaml
docker cp container_id:/deployment.yaml deployment.yaml
docker cp deployment.yaml local://deployment.yaml
docker cp container_id/deployment.yaml local://deplyment.yaml

Explanation

Question 157 of 171

A Linux administrator created the directory /project/access2all. By creating this directory, the administrator is trying to avoid the deletion or modification of files from non-owners. Which of the following will accomplish this goal?

Select one of the following:

chmod +t /project/access2all
chmod +rws /project/access2all
chmod 2770 /project/access2all
chmod ugo+rwx /project/access2all

Explanation

Question 158 of 171

A systems administrator is investigating an issue in which one of the servers is not booting up properly. The journalctl entries show the following:

[img]

Which of the following will allow the administrator to boot the Linux system to normal mode quickly?

Select one of the following:

Comment out the /opt/app filesystem in /etc/fstab and reboot.
Reformat the /opt/app filesystem and reboot.
Perform filesystem checks on local filesystems and reboot.
Trigger a filesystem relabel and reboot.

Explanation

Question 159 of 171

A system administrator configured firewall rules using firewalld. However, after the system is rebooted, the firewall rules are not present:

[img]

Which of the following is the reason the firewall rules are not active?

Select one of the following:

iptables is conflicting with firewalld.
The wrong system target is actived.
FIREWALL_ARGS has no value assigned.
The firewalld service is not enanbled.

Explanation

Question 160 of 171

A systems administrator is implementing a new service task with systems at startup and needs to execute a script entitled test.sh with the following content:

TIMESTAMP=$ (date '+%Y-%m-%d %H:%M:%S')
echo "helpme.service: timestamp $(Timestamp)" | systemd -cat -p info
sleep 60
done

The administrator tries to run the sript after making it executable with chmod +x; however, the script will not run. Which of the following should the administrator do the address this issue? (Choose two).

Select one or more of the following:

Add #!/bin/bash to the bottom of the script.
Create a unit file for the new service in /etc/systemd/system/ with the name helpme.service in the location
Add #!/bin/bash to the top of the script
Restart the computer to enable the new service.
Create a unit file for the new service in /etc/init.d with the name helpme.service in the location.
Shut down the computer to enable the new service.

Explanation

Question 161 of 171

A Linux administrator was tasked with deleting all files and directories with names that are contained in the sobelete.txt file. Which of the following commands will accomplish this task?

Select one of the following:

xargs -f cat toDelete.txt -rm
rm -d -r -f toDelete.txt
cat toDelete.txt | rm -frd
cat toDelete.txt | xargs rm -rf

Explanation

Question 162 of 171

After installing a new version of a package, a systems administrator notices a new version of the corresponding .service file was installed. In order to use the new version of the .service file, which of the following commands must be issued FIRST?

Select one of the following:

systemctl status
systemctl stop
systemctl reinstall
systemctl daemon-reload

Explanation

Question 163 of 171

A Linux system is failing to boot. The following error is displayed in the serial console:

[[1;33mDEPEND[Om] Dependency failed for /data.
[[1;33mDEPEND[Om] Dependency failed for Local File Systems.

Welcome to emergency model After logging in, type "journalctl -xb" to viewsystem logs, "systemctl reboot" to reboot, "systemctl default" to try again to boot into default mode.
Give root password for maintenance
(or type Control-D to continue}

Which of the following files will need to be modified for this server to be able to boot again?

Select one of the following:

/etc/mtab
/dev/sda
/etc/fstab
/etc/grub.conf

Explanation

Question 164 of 171

A system administrator is troubleshooting a connectivity issue pertaining to access to a system named db.example.com. The system IP address should be 192.168.20.88. The administrator issues the dig command and receives the following output:

;;ANSWER SECTION:
db.example.com. 15 IN A 192.168.20.89

The administrator runs grep db.example.com /etc/hosts and receives the following output:

192.168.20.89 db.example.com

Given this scenario, which of the following should the administrator do to address this issue?

Select one of the following:

Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.89.
Modify the /etc/network file and change the db.example.com entry to 192.168.20.88.
Modify the /etc/network file and change the db.example.com entry to 192.168.20.89.
Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.88.

Explanation

Question 165 of 171

A server is experiencing intermittent connection issues. Some connections to the Internet work as intended, but some fail as if there is no connectivity. The systems administrator inspects the server configuration:

[img]

Which of the following is MOST likely the cause of the issue?

Select one of the following:

An internal-only DNS server is configured.
The IP netmask is wrong for ens3.
Two default routes are configured.
The ARP table contains incorrect entries.

Explanation

Question 166 of 171

Joe, a user, is unable to log in to the Linux system. Given the following ouput:

[img]

Which of the following commands would resolve the issue?

Select one of the following:

usermod -s /bin/bash joe
pam_tally2 -u joe -r
passwd -u joe
change -E 90 joe

Explanation

Question 167 of 171

In order to copy data from another VLAN, a systems administrator wants to temporarily assign IP address 10.0.6.5/24 to the newly added network interface enpls0f1. Which of the following commands should the administrator run to achieve the goal?

Select one of the following:

ip addr add 10.0.6.5/24 dev enpls0f1
echo "IPV4_ADDRESS=10.0.6.5/24" > /etc/sysconfig/network-scripts/ifcfg-enpls0f1
ifconfig 10.0.6.5/24 enpsls0f1
nmcli conn add ipv4.address=10.0.6.5/24 if name snspls0f1

Explanation

Question 168 of 171

A Linux administrator booted up the server and was presented with a non-GUI terminal. The administrator ran the command systemctl isolate graphical.target and rebooted the system by running systemctl reboot, which fixed the issue?

Select one of the following:

The administrator did not reboot the server properly.
The administrator did not set the default target to basic.target.
The administrator did not set the default target to graphical.target.
The administrator did not shut down the server properly.

Explanation

Question 169 of 171

Users have been unable to save documents to /home/tmp/temp and have been receiving the following error:

Path not found

A junior technician checks the locations and see that /home/tmp/tempa was accidentally created instead of /home/tmp/temp. Which of the following commands should the technician use to fix this issue?

Select one of the following:

cp /home/tmp/tempa /home/tmp/temp
mv /home/tmp/tempa /home/tmp/temp
cd /temp/tmp/tempa
ls /home/tmp/tempa

Explanation

Question 170 of 171

A systems administrator is encountering performance issues. The administrator runs a command with the following output:

09:10:18 up 457 days, 32 min, 5 users, load average: 4.22 6.63 5.58

The Linux server has the following system properties:

CPU4 vCPU
Memory: 50GB

Which of the following accurately describes this situation?

Select one of the following:

The system is under CPU pressure and will requires additional vCPUs.
The system has been running for over a year and requires a reboot.
Too many users are currently logged in to the system.
The system requires more memory.

Explanation

Question 171 of 171

A Linux administrator found many containers in an exited state. Which of the following commands will allow the administrator to clean up the contaners in an exited state?

Select one of the following:

docker rm --all
docker rm $(docker ps -aq)
docker images prune*
docker rm --state exited

Explanation

Check answer

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	Created by Sc Con over 1 year ago

Recurso de estudio para certificación CompTIA Linux + XK005.

CompTIA Linux+ XK005 (171Q).

Question 1 of 171

A systems administrator pressed Ctrl+Z after starting a program using the command line, and the shell prompt was presented. In order to go back to the program, which of the following commands can the administrator use?

Select one of the following:

Explanation

Question 2 of 171

A Linux administrator is alerted to a storage capacity issue on a server without a specific mount point or directory. Which of the following commands would be MOST helpful for troubleshooting? (Choose two).

Select one or more of the following:

Explanation

Question 3 of 171

A Linux administrator needs to resolve a service that has failed to start. The administrator runs the following command: ls -l startup file The following output is retorned ---------. root root 81k Sep 13 19:01 startupfile Which of the following is MOST likely the issue?

Select one of the following:

Explanation

Question 4 of 171

Select one of the following:

Explanation

Question 5 of 171

A cloud engineer needs to launch a container named web-01 in background mode. Which of the following commands will accomplish this task?

Select one of the following:

Explanation

Question 6 of 171

A Linux administrator is tasked with adding users to the system. However, the administrator wants to ensure ther users access will be disebled once the project is over. The expiration date should be 2021-09-30. Which of the following commands will accomplish this task?

Select one of the following:

Explanation

Question 7 of 171

A systems administrator frequently connects to a remote host via SSH and a non-standard port. The system administrator would like to avoid passing the port parameter on the command line every time. Which of the following files can be used to set a different port value for that host?

Select one of the following:

Explanation

Question 8 of 171

Select one of the following:

Explanation

Question 9 of 171

A Linux administrator needs to analyze a failing application that is running inside a container. Which of the following commands allows the Linux administrator to enter the running container and analyze the logs that are stored inside?

Select one of the following:

Explanation

Question 10 of 171

A Linux administrator was asked to run a container with the httpd server inside. This container should be exposed at port 443 of a Linux host machine while it internally listens on port 8443. Which of the following commands will accomplish this task?

Select one of the following:

Explanation

Question 11 of 171

A systems administrator requires that all files that are created by the user named web have read-only permissions by the owner. Which of the following commands will satisfy this requirement?

Select one of the following:

Explanation

Question 12 of 171

Select one of the following:

Explanation

Question 13 of 171

Select one or more of the following:

Explanation

Question 14 of 171

Select one of the following:

Explanation

Question 15 of 171

A Linux administrator is providing a new Nginx image from the registry to local cache. Which of the following commands would allow this to happen?

Select one of the following:

Explanation

Question 16 of 171

A new Linux systems administrator just generated a pair of SSH keys that should allow connection to the servers. Which of the following commands can be used to copy a key file to remote servers? (Choose two).

Select one or more of the following:

Explanation

Question 17 of 171

A Linux engineer is setting the sticky bit on a directory called devops with 755 file permission. Which of the following commands will accomplish this task?

Select one of the following:

Explanation

Question 18 of 171

An administrator accidentally deleted the /boot/vmlinuz file and must resolve the issue before the server is rebooted. Which of the following commands should the administrator use to identify the correct version of this file?

Select one of the following:

Explanation

Question 19 of 171

A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following ouput: [image] Given there is a single CPU in the server, which of the following is causing the slowness?

Select one of the following:

Explanation

Question 20 of 171

A Linux administrator wants to set the SUID of a file named dev_team.text with 744 access rights. Which of the following commands will achieve this goal?

Select one of the following:

Explanation

Question 21 of 171

Which of the following commands will display the operating system?

Select one of the following:

A systems administrator pressed Ctrl+Z after starting a program using the command line, and the shell prompt was presented.
In order to go back to the program, which of the following commands can the administrator use?

A Linux administrator is alerted to a storage capacity issue on a server without a specific mount point or directory.
Which of the following commands would be MOST helpful for troubleshooting? (Choose two).

A Linux administrator needs to resolve a service that has failed to start. The administrator runs the following command:

ls -l startup file

The following output is retorned

---------. root root 81k Sep 13 19:01 startupfile

Which of the following is MOST likely the issue?

A cloud engineer needs to launch a container named web-01 in background mode.
Which of the following commands will accomplish this task?

A Linux administrator is tasked with adding users to the system. However, the administrator wants to ensure ther users access will be disebled once the project is over.
The expiration date should be 2021-09-30.
Which of the following commands will accomplish this task?

A systems administrator frequently connects to a remote host via SSH and a non-standard port. The system administrator would like to avoid passing the port parameter on the command line every time.
Which of the following files can be used to set a different port value for that host?

A Linux administrator needs to analyze a failing application that is running inside a container.
Which of the following commands allows the Linux administrator to enter the running container and analyze the logs that are stored inside?

A Linux administrator was asked to run a container with the httpd server inside. This container should be exposed at port 443 of a Linux host machine while it internally listens on port 8443.
Which of the following commands will accomplish this task?

A systems administrator requires that all files that are created by the user named web have read-only permissions by the owner.
Which of the following commands will satisfy this requirement?

A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following ouput:

[image]

Given there is a single CPU in the server, which of the following is causing the slowness?

A junior Linux administrator is tasked with installing an application. The installation guide states the application should only be installed in a run level 5 environment.

$systemctl get-default
getty.target

Which of the following commands would ensure the server is set to run level 5?

When trying to log in remotely to a server, a user receives the following message:

[image]

Which of the following is causing the issue?