Questions-CertNCIA-#1

Question 1 of 50

1

Which word starts a command to display the operational status of a Junos device?

Select one of the following:

A. put
B. set
C. show
D. get

Explanation

Question 2 of 50

1

Which command prompt indicates that you are in operational mode?

Select one of the following:

A. user@router&
B. user@router#
C. user@router%
D. user@router>

Explanation

Question 3 of 50

1

What is the decimal equivalent of 00000100?

Select one of the following:

A. 2
B. 4
C. 9
D. 12

Explanation

Question 4 of 50

1

What is a valid IPv6 address?

Select one of the following:

A. 00:05:85:23:45:67
B. 127.0.0.1
C. 2001:0db8:3000:2215:0000:0000:aaaa:1111
D. 49.0001.0192.0168.1001.00

Explanation

Question 5 of 50

1

Which simplified IPv6 address is the same as the IP address
2001:0000:1000:0000:0000:cbff:0020:0001/64?

Select one of the following:

A. 2001::1::cbff:2:0001/64
B. 2001::1000::cbff:20:1/64
C. 2001:0:1000::cbff:20:1/64
D. 2001:0:1:0:0:cbff:2:1/64

Explanation

Question 6 of 50

1

What are three characteristics of UDP? (Choose three.)

Select one or more of the following:

A. UDP is faster than TCP.
B. UDP operates at the Transport Layer.
C. UDP is connection-oriented.
D. UDP data is sent best-effort.
E. UDP is more reliable than TCP.

Explanation

Question 7 of 50

1

Which layer in the OSI model is responsible for translating frames into bits?

Select one of the following:

A. Application Layer
B. Presentation Layer
C. Data Link Layer
D. Physical Layer

Explanation

Question 8 of 50

1

Which layer in the TCP/IP model is responsible for delivering packets to their destination?

Select one of the following:

A. Application Layer
B. Transport Layer
C. Internet Layer
D. Network Access Layer

Explanation

Question 9 of 50

1

Why is IPv6 packet processing more effective than IPv4 packet processing?

Select one of the following:

A. fixed header size
B. smaller header size
C. fewer header fields
D. variable header size

Explanation

Question 10 of 50

1

A user opens a webpage that requires the transmission of packets from the Web server to
the client's browser. The packets transmitted from the Web server to the client exceed the
smallest MTU value on the communications path.
Which two protocol functions allow this type of communication? (Choose two.)

Select one or more of the following:

A. packet segmentation
B. serialized checking
C. packet sequencing
D. parallel checking

Explanation

Question 11 of 50

1

Which two statements are true about TCP communication? (Choose two.)

Select one or more of the following:

A. The receiver acknowledges the final packet in each communications stream.
B. The receiver adds sequencing numbers to the packets received.
C. The sender adds sequencing numbers to the packets it sends.
D. The receiver acknowledges each packet it receives from the sending device.

Explanation

Question 12 of 50

1

Which two statements are true about optical networks? (Choose two.)

Select one or more of the following:

A. SONET and SDH both use time-division multiplexing.
B. An optical transport network system uses time-division multiplexing.
C. SONET and SDH both use wavelength-division multiplexing.
D. An optical transport network system uses wavelength-division multiplexing.

Explanation

Question 13 of 50

1

At which layer of the OSI model does error checking occur with IPv6?

Select one of the following:

A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 7

Explanation

Question 14 of 50

1

Which statement is correct regarding IPv6 addresses?

Select one of the following:

A. An IPv6 address consists of 128 bits separated into eight 16-bit hexadecimal sections.
B. An IPv6 address consists of 64 bits separated into four 16-bit hexadecimal sections.
C. An IPv6 address consists of 128 bits separated into sixteen 8-bit hexadecimal sections.
D. An IPv6 address consists of 64 bits separated into eight 8-bit hexadecimal sections.

Explanation

Question 15 of 50

1

Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.)

Select one or more of the following:

A. LSPs are bidirectional.
B. LSPs are unidirectional.
C. LSPs must follow the IGP's shortest path.
D. LSPs can follow paths other than the IGP's shortest path.

Explanation

Question 16 of 50

1

What are two ways that packet fragmentation is handled differently between IPv6 and IPv4? (Choose two.)

Select one or more of the following:

A. End hosts determine the path MTU for IPv6.
B. End hosts determine the path MTU for IPv4.
C. Packet fragmentation occurs at intermediate nodes for IPv4.
D. Packet fragmentation occurs at intermediate nodes for IPv6.

Explanation

Question 17 of 50

1

-- Exhibit --
user@router> show route protocol static
inet.0: 15 destinations, 15 routes (15 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
99.0.0.0/17 [Static/5] 00:00:11
>to 10.1.1.2 via ge-0/0/1.0
99.0.0.0/19 [Static/5] 00:00:11
>to 10.1.2.2 via ge-0/0/2.0
99.0.0.0/24 [Static/5] 00:00:11
>to 10.1.3.2 via ge-0/0/3.0
99.0.0.0/26 [Static/5] 00:00:11
>to 10.1.4.2 via ge-0/0/4.0
-- Exhibit --

In the exhibit, there are four static routes that route traffic through different interfaces.
Which interface does the router use if traffic is sent to the 99.0.0.1 destination?

Select one of the following:

A. ge-0/0/1
B. ge-0/0/2
C. ge-0/0/3
D. ge-0/0/4

Explanation

Question 18 of 50

1

In dotted decimal notation, what is the equivalent of 11010101 01000010 01111111
11000010?

Select one of the following:

A. 213.66.127.194
B. 214.66.128.195
C. 212.64.143.194
D. 213.66.111.194

Explanation

Question 19 of 50

1

What is the binary equivalent of 242.168.94.124?

Select one of the following:

A. 11110011 10101000 01011110 01111100
B. 11110010 10101010 01011110 01111100
C. 11110010 10101000 01011110 01111100
D. 11110010 10101000 01010110 01111100

Explanation

Question 20 of 50

1

What is the last usable IP address in the 218.6.0.0/17 network?

Select one of the following:

A. 218.6.125.254
B. 218.6.126.254
C. 218.6.127.254
D. 218.6.128.254

Explanation

Question 21 of 50

1

What is the network address for the 10.13.147.100/19 host?

Select one of the following:

A. 10.13.128.0
B. 10.13.147.0
C. 10.13.0.0
D. 10.13.100.0

Explanation

Question 22 of 50

1

Which two prefixes would summarize the networks shown below? (Choose two.)
192.168.1.0/24
192.168.2.0/24
192.168.3.0/24

Select one or more of the following:

A. 192.168.0.0/23
B. 192.168.0.0/22
C. 192.168.0.0/24
D. 192.168.0.0/21

Explanation

Question 23 of 50

1

How many host addresses are available in the /28 network?

Select one of the following:

A. 6
B. 14
C. 28
D. 30

Explanation

Question 24 of 50

1

What are three benefits of using IPv6? (Choose three.)

Select one or more of the following:

A. IPv6 supports a greater level of security by integrating features that were optional addons
in IPv4.
B. IPv6 reduces administrative overhead using stateless address autoconfiguration for
hosts.
C. IPv6 eliminates the need for private to public NAT using a large address pool.
D. IPv6 provides backward compatibility with IPv4 using the Next Header field.
E. IPv6 represents large IP addresses using dotted decimal notation.

Explanation

Question 25 of 50

1

Which statement is correct about the forwarding table?

Select one of the following:

A. The forwarding table is stored only on the PFE.
B. The forwarding table contains all known routes.
C. The forwarding table is stored on both the RE and PFE.
D. The forwarding table is stored only on the RE.

Explanation

Question 26 of 50

1

Which statement describes exception traffic?

Select one of the following:

A. Exception traffic must be sent to the PFE for processing.
B. Exception traffic enters one ingress port and is sent out multiple egress ports.
C. Exception traffic is rate-limited on the internal link to prevent DoS attacks.
D. Exception traffic is processed after forwarding traffic when congestion exists.

Explanation

Question 27 of 50

1

What are two benefits of the modular design of the Junos OS? (Choose two.)

Select one or more of the following:

A. Each module uses application-specific integrated circuits (ASICs).
B. Each module runs in its own protected memory space.
C. Each module can be individually restarted.
D. Each module is supported across all Junos platforms.

Explanation

Question 28 of 50

1

Which statement describes the PFE?

Select one of the following:

A. The PFE controls the RE by providing Layer 2 and Layer 3 forwarding tables.
B. The PFE implements advanced services such as policing, stateless firewall filtering, and
class of service.
C. The PFE sends traffic to the RE for systematic packet forwarding.
D. The PFE receives hardware and environmental status messages from the RE.

Explanation

Question 29 of 50

1

Which process is responsible for the routing protocols on a Junos device?

Select one of the following:

A. rpd
B. mgd
C. dcd
D. chassisd

Explanation

Question 30 of 50

1

Which process is responsible for the configuration of the router and all user commands on
a Junos device?

Select one of the following:

A. rpd
B. chassisd
C. dcd
D. mgd

Explanation

Question 31 of 50

1

How does the PFE handle unicast transit traffic destined for an existing forwarding table
entry?

Select one of the following:

A. It sends the traffic through one egress port toward its destination.
B. It sends the traffic through multiple egress ports to all available receivers.
C. It sends the traffic through an internal link to the RE.
D. It sends the traffic to the local system for further processing.

Explanation

Question 32 of 50

1

Which two design goals describe the Junos OS design? (Choose two.)

Select one or more of the following:

A. clean separation of security and routing policies
B. clean separation of control and forwarding planes
C. modularization of multiple software processes
D. a single hardware platform for all software applications

Explanation

Question 33 of 50

1

Which two Junos platforms provide stateful firewall functionality? (Choose two.)

Select one or more of the following:

A. MX Series
B. EX Series
C. SRX Series
D. QFX Series

Explanation

Question 34 of 50

1

What are two examples of RE exception traffic? (Choose two.)

Select one or more of the following:

A. BGP updates that travel through the local router and are destined for a remote router.
B. OSPF hello packets that are sent from a remote router and are destined for the local
router.
C. Telnet traffic that is sent from a remote host and is destined for the local router.
D. Telnet traffic that travels through the local router and is destined for a remote end host.

Explanation

Question 35 of 50

1

In the Junos OS, what handles transit traffic?

Select one of the following:

A. Transit traffic is handled by the RE only.
B. Transit traffic is handled by the PFE only.
C. Transit traffic is handled by both the RE and the PFE.
D. Transit traffic is not handled by the RE or the PFE.

Explanation

Question 36 of 50

1

Which statement describes transit traffic?

Select one of the following:

A. Traffic addressed to the chassis that requires some form of special handling by the RE
before it can be forwarded out an egress port.
B. Traffic that enters an ingress port, is compared against the forwarding table, and is
forwarded out an egress port.
C. Any traffic that requires the generation of an ICMP message.
D. Traffic that requires some form of special attention and does not pass through the
device.

Explanation

Question 37 of 50

1

What is the central processing component of the forwarding plane?

Select one of the following:

A. PFE
B. RE
C. Junos OS
D. forwarding table

Explanation

Question 38 of 50

1

Which statement is correct regarding the Junos OS?

Select one of the following:

A. The same Junos OS image is used on all Junos devices.
B. The Junos OS provides separation between the control and forwarding planes.
C. Each Junos OS image is based on model-specific source code.
D. The Junos OS creates a secondary instance of the kernel to ensure redundancy.

Explanation

Question 39 of 50

1

What are two functions of the RE? (Choose two).

Select one or more of the following:

A. to maintain routing tables
B. to forward traffic toward its destination
C. to manage the PFE
D. to implement various services such as policing, stateless firewall filtering, and class of
service

Explanation

Question 40 of 50

1

Which statement is correct regarding exception traffic processing?

Select one of the following:

A. Exception traffic is only handled by the PFE.
B. Exception traffic is rate-limited across the internal link to protect the RE.
C. Exception traffic is not prioritized during times of congestion.
D. Exception traffic is forwarded based on forwarding table entries.

Explanation

Question 41 of 50

1

When using keyboard shortcuts, which single keystroke combination allows users to erase
the entire current command?

Select one of the following:

A. Ctrl + a
B. Ctrl + e
C. Ctrl + u
D. Ctrl + w

Explanation

Question 42 of 50

1

When using keyboard shortcuts, which keystroke combination allows users to erase a
single word to the left of the cursor?

Select one of the following:

A. Ctrl + a
B. Ctrl + e
C. Ctrl + u
D. Ctrl + w

Explanation

Question 43 of 50

1

What must you type to enter operational mode from the root@% command prompt?

Select one of the following:

A. exit
B. configure
C. edit
D. cli

Explanation

Question 44 of 50

1

Which two commands would you use to discard a candidate configuration? (Choose two.)

Select one or more of the following:

A. rollback
B. delete
C. delete 0
D. rollback 0

Explanation

Question 45 of 50

1

Which two statements are true about the configure exclusive command? (Choose two.)

Select one or more of the following:

A. It allows users to retain all uncommitted changes when exiting exclusive configuration
mode.
B. It allows multiple users to edit private copies of the configuration concurrently.
C. It causes the loss of all uncommitted changes when exiting exclusive configuration
mode.
D. It excludes other users from editing the configuration.

Explanation

Question 46 of 50

1

Which command will display the active configuration?

Select one of the following:

A. user@router> show configuration
B. user@router# show
C. user@router> show system configuration
D. user@router> show system commit

Explanation

Question 47 of 50

1

Which three commands will cause a logical interface to go administratively down after
being committed? (Choose three.)

Select one or more of the following:

A. shutdown
B. deactivate
C. disable
D. down
E. delete

Explanation

Question 48 of 50

1

Which command returns a list of commands in which a given keyword is used throughout
the Junos hierarchies?

Select one of the following:

A. help topic
B. help reference
C. help apropos
D. help tip

Explanation

Question 49 of 50

1

Which three statements are true regarding the candidate configuration? (Choose three.)

Select one or more of the following:

A. The candidate configuration is a temporary configuration that might become the active
configuration.
B. A candidate configuration is initially populated with the configuration currently active on
the system.
C. Changes to the candidate configuration take effect immediately.
D. The candidate configuration becomes the active configuration after a system reboot.
E. The configure private command allows concurrent editing of a candidate configuration
by multiple users.

Explanation

Question 50 of 50

1

-- Exhibit --
[edit]
user@router# show | compare
[edit protocols ospf area 0.0.0.0]
- interface ge-0/0/0.0 {
- disable;
- }
[edit protocols ospf]
area 0.0.0.0 { ... }
+ area 0.0.0.1 {
+ interface ge-0/0/0.0;
+ }
-- Exhibit --

Referring to the exhibit, what are two differences between the active and candidate
configurations? (Choose two.)

Select one or more of the following:

A. The ge-0/0/0 interface was added to the candidate configuration.
B. Area 0 was added to the active configuration.
C. Area 1 was added to the candidate configuration.
D. The ge-0/0/0 interface was added to the active configuration.

	Created by fdsqwertyfds qwerty over 8 years ago

Certncia 1

Questions-CertNCIA-#1

Question 1 of 50

Which word starts a command to display the operational status of a Junos device?

Select one of the following:

Explanation

Question 2 of 50

Which command prompt indicates that you are in operational mode?

Select one of the following:

Explanation

Question 3 of 50

What is the decimal equivalent of 00000100?

Select one of the following:

Explanation

Question 4 of 50

What is a valid IPv6 address?

Select one of the following:

Explanation

Question 5 of 50

Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64?

Select one of the following:

Explanation

Question 6 of 50

What are three characteristics of UDP? (Choose three.)

Select one or more of the following:

Explanation

Question 7 of 50

Which layer in the OSI model is responsible for translating frames into bits?

Select one of the following:

Explanation

Question 8 of 50

Which layer in the TCP/IP model is responsible for delivering packets to their destination?

Select one of the following:

Explanation

Question 9 of 50

Why is IPv6 packet processing more effective than IPv4 packet processing?

Select one of the following:

Explanation

Question 10 of 50

Select one or more of the following:

Explanation

Question 11 of 50

Which two statements are true about TCP communication? (Choose two.)

Select one or more of the following:

Explanation

Question 12 of 50

Which two statements are true about optical networks? (Choose two.)

Select one or more of the following:

Explanation

Question 13 of 50

At which layer of the OSI model does error checking occur with IPv6?

Select one of the following:

Explanation

Question 14 of 50

Which statement is correct regarding IPv6 addresses?

Select one of the following:

Explanation

Question 15 of 50

Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.)

Select one or more of the following:

Explanation

Question 16 of 50

What are two ways that packet fragmentation is handled differently between IPv6 and IPv4? (Choose two.)

Select one or more of the following:

Explanation

Question 17 of 50

Select one of the following:

Explanation

Question 18 of 50

In dotted decimal notation, what is the equivalent of 11010101 01000010 01111111 11000010?

Select one of the following:

Explanation

Question 19 of 50

What is the binary equivalent of 242.168.94.124?

Select one of the following:

Explanation

Question 20 of 50

What is the last usable IP address in the 218.6.0.0/17 network?

Select one of the following:

Explanation

Which simplified IPv6 address is the same as the IP address
2001:0000:1000:0000:0000:cbff:0020:0001/64?

In dotted decimal notation, what is the equivalent of 11010101 01000010 01111111
11000010?

Which two prefixes would summarize the networks shown below? (Choose two.)
192.168.1.0/24
192.168.2.0/24
192.168.3.0/24

Which process is responsible for the configuration of the router and all user commands on
a Junos device?

How does the PFE handle unicast transit traffic destined for an existing forwarding table
entry?