CCNA Answers – CCNA Exam

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Question 1 of 49

Refer to the exhibit. R1 and R2 are connected via serial interfaces. Both interfaces show that there is Layer 2 connectivity between them. The administrator verifies that CDP is operational; however, pings between the two interfaces are unsuccessful. What is the cause of this connectivity problem?

Select one of the following:

no set loopback
incorrect subnet mask on R2
incompatible bandwidth
incorrect IP address on R1
incompatible encapsulation

Explanation

Question 2 of 49

What are two benefits of using ACLs? (Choose two.)

Select one or more of the following:

They provide IP filtering.
They reduce the processing load on the router.
They simplify the configuration of inter-VLAN routing.
They prevent routing loops and facilitate convergence.
They identify traffic for multiple uses such as QoS and NAT.

Explanation

Question 3 of 49

Refer to the exhibit. A network support technician has been asked to set an IP address on one of the FastEthernet interfaces on a new router. What is causing the interface to reject the address?

Select one of the following:

The IP address is already in use.
The technician is using a network address.
The technician is using the wrong subnet mask for /26.
The technician must enable VLSM on the interface.

Explanation

Question 4 of 49

Refer to the exhibit. What are the DR and the BDR on the network? (Choose two.)

Select one or more of the following:

The DR is router 1.
The DR is router 2.
The DR is router 3.
The BDR is router 1.
The BDR is router 2.
The BDR is router 3.

Explanation

Question 5 of 49

What two types of information would a network administrator receive after excuting a show version command on a Cisco router? (Choose two.)

Select one or more of the following:

the quantity of available memory
the operational status of each interface
the number and type of available interfaces
the IP addresses of the LAN and WAN interfaces
the list of MAC addresses of each connected PC
the list of networks advertised by the routing protocol

Explanation

Question 6 of 49

Refer to the exhibit. What is represented by the Null0 route for the 128.107.0.0 network?

Select one of the following:

a child route that is defined
a parent route that is defined and sourced from a physical interface
a summary route for advertising purposes, not an actual path
the result of the no auto-summary command on a router

Explanation

Question 7 of 49

Refer to the exhibit. EIGRP has been configured on all routers in the network. Router R1 cannot form a neighbor relationship with router R2. On the basis of the show ip protocols command output that is provided, what could be the cause of the problem?

Select one of the following:

Automatic summarization is enabled on both routers.
The processes on both routers are configured for incorrect networks.
There is a different autonomous system number on each router.
The metric value for K2, K4, and K5 parameters on both routers is set to “0."

Explanation

Question 8 of 49

What is the function of mutilink PPP?

Select one of the following:

It allows VLAN ID information to be forwarded between multiple routers on the WAN.
It allows multiple physical links to be used as a single logical link.
It allows multiple remote users to share the same VPN tunnel.
It allows an enterprise to connect to multiple ISPs

Explanation

Question 9 of 49

After comparing a previous baseline to current network statistics, the network engineer has discovered a significant increase in unwarranted traffic to the extranet. Which two steps simplify administration and control the unwanted traffic? (Choose two.)

Select one or more of the following:

define an ACL at the distribution layer to isolate packets
add an ACL at the router in the enterprise edge to block the traffic
deploy a Layer 3 switch to contain broadcasts
connect remote locations directly to the intranet
configure all hosts with the same default gateway to eliminate unnecessary broadcasts
deploy one core ISP router to reduce the delay in path determination

Explanation

Question 10 of 49

Refer to the exhibit. Router1 and Router2 are both running RIPv2 with autosummarization disabled. Which subnet mask will Router1 associate with network 192.168.4.16/28?

Select one of the following:

255.255.0.0
255.255.240.0
255.255.255.0
255.255.255.240
255.255.255.248

Explanation

Question 11 of 49

What are two WAN protocols that define parameters for data encapsulation? (Choose two.)

Select one or more of the following:

PPP
V.35
X.21
HDLC
EIA/TIA-232

Explanation

Question 12 of 49

Which two STP states allow a switch to learn MAC addresses? (Choose two.)

Select one or more of the following:

blocking
listening
learning
disabled
forwarding

Explanation

Question 13 of 49

What should be considered when designing an addressing scheme that uses private IP address space?

Select one of the following:

Private IP addresses are globally routable.
Address summarization is not recommended.
Hierarchical design principles should be utilized.
Discontiguous networks are no longer problematic.

Explanation

Question 14 of 49

Which type of distance vector routing mechanism helps prevent the formation of loops by preventing routing information from exiting a router interface through the same interface on which it was received?

Select one of the following:

split horizon
hold-down timer
poisoned reverse
setting maximum hop count

Explanation

Question 15 of 49

What is the purpose of assigning an IP address to a Layer 2 switch?

Select one of the following:

to allow in-band management
to provide inter-VLAN connectivity
to facilitate election of a root bridge
to configure a default gateway for the network

Explanation

Question 16 of 49

Refer to the exhibit. Assuming that all three routers are configured with the EIGRP routing protocol and sharing information, what information can be gathered from the show command output?

Select one of the following:

Router B has EIGRP adjacencies with both router A and C.
Router B has a fully converged topology table.
Router B has not formed an adjacency with router A.
Router B has not formed an adjacency with router C.

Explanation

Question 17 of 49

What do companies gain from the services performed at the enterprise edge?

Select one of the following:

faster communication with server farms
stronger security against malicious attacks
faster communication with Internet destinations
enhanced performance and reliability through VLANs and redundant trunk links

Explanation

Question 18 of 49

A network administrator is creating an addressing scheme and has determined that the company network 192.168.1.0/24 will require 8 subnets with at least 25 hosts on each subnet. Which subnet mask will meet these requirements?

Select one of the following:

Explanation

Question 19 of 49

Refer to the exhibit. Which route will appear in the routing table?

Select one of the following:

R 10.10.4.0/24 [120/1] via 10.10.10.1, 00:00:12, FastEthernet0/1
R 10.10.4.0/24 [120/1] via 10.10.20.1, 00:00:12, FastEthernet0/0
R 10.10.4.0/24 [120/2] via 10.10.20.1, 00:00:12, FastEthernet0/0
R 10.10.4.0/24 [120/3] via 10.10.30.1, 00:00:12, FastEthernet1/0
R 10.10.4.0/24 [120/1] via 10.10.30.1, 00:00:12, FastEthernet1/0

Explanation

Question 20 of 49

Refer to the exhibit. A network administrator wishes to deny Internet access to all R2 LAN hosts, while allowing these hosts to reach all other devices on the company networks. Where should the ACL shown in the exhibit be placed to meet these requirements?

Select one of the following:

R2: Fa0/0 inbound
R1: S0/1/0 outbound
R1: S0/0/1 inbound
R2: S0/0/1 outbound
R2: Fa0/0 outbound

Explanation

Question 21 of 49

Refer to the exhibit. Which IP address can be assigned to the Fa0/0 interface of R1 to enable host A to access host B?

Select one of the following:

192.168.1.32/26
192.168.1.64/26
192.168.1.126/26
192.168.1.129/26

Explanation

Question 22 of 49

Refer to the exhibit. What is the result of configuring the newly installed R1 with the exhibited command?

Select one of the following:

It will set the gateway of last resort for R1.
It will configure the IP address 10.1.1.2 on one interface of R1.
It configures the router to forward traffic that is destined for the 192.168.1.128/26 network through the interface with IP address 10.1.1.2.
It configures a static route for all packets with the source network address 192.168.1.128/26.

Explanation

Question 23 of 49

Refer to the exhibit. EIGRP has been configured on all routers in the network. An EIGRP summary route is configured on the HQ router. How will packets destined for the 192.168.0.10/24 network be handled by router HQ?

Select one of the following:

The traffic will be forwarded to router R2 using the default route.
The traffic will be forwarded to the BR1 and BR2 branch routers.
The traffic will be forwarded to the BR3 and BR4 branch routers.
The traffic will be forwarded to routers BR1, BR2, BR3, and BR4.
The traffic will be forwarded to the Null0 interface and will be discarded.

Explanation

Question 24 of 49

What is the function of VTP in a LAN switching environment?

Select one of the following:

controls broadcasts
standardizes VLAN tags
simplifies VLAN management
creates subinterfaces for inter-VLAN routing

Explanation

Question 25 of 49

Refer to the exhibit. In what sequence (from first to last) does an OSPF router check the parameters listed when selecting the DR?

Select one of the following:

C, B, A, D
D, C, B, A
A, B, C, D
A, C, B, D
B, C, A, D

Explanation

Question 26 of 49

Which two statements correctly describe RIPv1 and RIPv2? (Choose two.)

Select one or more of the following:

Both broadcast their entire routing table from all participating interfaces to 255.255.255.255.
Both advertise their routing updates out all active interfaces every 30 seconds.
Both have the same administrative distance value of 120.
Both can turn off automatic summarization.
Both support VLSM and CIDR.

Explanation

Question 27 of 49

Refer to the exhibit. Identify the path the frames will take from PC1 to PC2 in an OSPF network.

Select one of the following:

R1, R5
R1, R3, R5
R1, R4, R5
R1, R2, R3, R5

Explanation

Question 28 of 49

Refer to the exhibit. How will Switch2 respond to the VTP advertisement sent by Switch1?

Select one of the following:

It will ignore the VTP advertisement.
It will add two VLANs to its database.
It will change its configuration revision number to 4.
It will send the VTP advertisement to Switch1 to delete the two VLANs.

Explanation

Question 29 of 49

Which device or component is located at the customer premises and provides the clocking signal for the customer router on a WAN circuit?

Select one of the following:

DTE serial interface
CSU/DSU
central office switch
internal clock on the router
patch panel at the point of demarcation

Explanation

Question 30 of 49

Refer to the exhibit. Server7 has been added to the server farm network. The hosts can ping Servers 2 and 3 and Server2 and Server3 can ping each other. Server7 cannot ping the other servers connected to the switch. What is the cause of this problem?

Select one of the following:

The Fa0/1 port on the switch should be in access mode.
The switch IP address is not on the same subnet as Server7.
The switch port used for Server7 is not in the same VLAN as Server2 and Server3.
The Fa0/0 interface of the router has not been configured for subinterfaces to support inter-VLAN routing.

Explanation

Question 31 of 49

What are two features of an extended IP ACL? (Choose two.)

Select one or more of the following:

It uses numbers 1 through 99 for identification.
It can permit or deny traffic based on source or destination address.
It detects malicious attacks against the network and logs them on a server.
It can filter traffic based on the protocol and port numbers.
It encrypts traffic between hosts.

Explanation

Question 32 of 49

Which two statements correctly describe RIPv1 and RIPv2? (Choose two.)

Select one or more of the following:

Both broadcast their entire routing table from all participating interfaces to 255.255.255.255.
Both advertise their routing updates out all active interfaces every 30 seconds.
Both have the same administrative distance value of 120.
Both can turn off automatic summarization.
Both support VLSM and CIDR.

Explanation

Question 33 of 49

Refer to the exhibit. The network administrator has configured R1, R2, and R3 to use RIPv2, and the network is fully converged. The hosts on the internal network are able to access R2, but they are unable to access the Internet.
How can the administrator solve this problem?

Select one of the following:

Enable the Serial0/0/0 interface of R2.
Configure a default route on R2 via Serial0/0/0 and propagate it to R1 and R3 using RIPv2.
Configure a default route on the ISP via Serial0/0/0.
Configure the correct subnet mask on the Serial0/0/0 interface of R2.

Explanation

Question 34 of 49

Which characteristic is associated with a floating static route?

Select one of the following:

always appears in the routing table
has an administrative distance of 0
is considered the primary route because of its low administrative distance
usually has an administrative distance greater than routes learned from a dynamic routing protocol

Explanation

Question 35 of 49

Refer to the exhibit. If R4 is announcing all shown internal networks as a summary address to the ISP, which summary address will be most specific?

Select one of the following:

192.168.1.0/22
192.168.4.0/21
192.168.6.0/23
192.168.8.0/21
192.168.4.0/22

Explanation

Question 36 of 49

Which three statements are true about the RIP and EIGRP routing protocols? (Choose three.)

Select one or more of the following:

Both routing protocols are distance vector protocols.
RIP forms neighbor adjacencies whereas EIGRP does not.
Both routing protocols have a maximum hop count limitation.
Both routing protocols use a composite metric for destination networks.
RIP and EIGRP both support equal cost load balancing, but only EIGRP supports unequal cost load balancing.
EIGRP has a higher administrative distance making it the preferred protocol when compared to a RIP route in the same network.

Explanation

Question 37 of 49

Refer to the exhibit. Both routers are configured to use the EIGRP routing protocol. However, when the show ip eigrp neighbors command is issued at R1, the output displays that the routers are unable to establish adjacency. What is the possible cause of this problem?

Select one of the following:

EIGRP routing is incorrectly configured at R1.
The autonomous system number is the same on both routers.
The no auto-summary command is applied on both routers.
The IP address of the serial interfaces of both routers is incorrectly configured.

Explanation

Question 38 of 49

What is the effect of adding Layer 2 switches to a network?

Select one of the following:

software-based forwarding
elimination of broadcast traffic
decrease in the size of collision domains
permissible cable lengths greater than 100 meters

Explanation

Question 39 of 49

Which network statement would include the 172.20.64.0 /19 network in the OSPF routing process?

Select one of the following:

Router(config-router)# network 172.20.64.0 0.0.0.31 area 0
Router(config-router)# network 172.20.64.0 0.0.0.63 area 0
Router(config-router)# network 172.20.64.0 0.0.15.255 area 0
Router(config-router)# network 172.20.64.0 0.0.31.255 area 0

Explanation

Question 40 of 49

What will be the two wildcard masks required in an extended access list statement that blocks traffic to host 192.168.5.45 from the 172.16.240.0/27 network? (Choose two.)

Select one or more of the following:

0.0.0.0
255.255.240.0
255.255.255.255
0.0.31.255
255.255.255.240
0.0.0.31

Explanation

Question 41 of 49

Refer to the exhibit. Users on the 172.30.20.0/24 network are unable to access any of the servers located on the 192.168.0.0/23 network. Given the network topology and OSPF configuration, what two problems exist in this network? (Choose two.)

Select one or more of the following:

There is a routing loop occurring between all three routers.
There is a network statement missing.
Network 172.30.20.0 has an incorrect wildcard mask.
The OSPF area configuration is incorrect.
/23 is an invalid subnet mask for the 192.168.0.0 network.

Explanation

Question 42 of 49

Refer to the exhibit. Host A originates and sends broadcast frames to the network. Which hosts will receive the broadcast frames?

Select one of the following:

hosts B and C
hosts D and G
hosts A, B, and C
hosts A, D, and G
all hosts

Explanation

Question 43 of 49

Refer to the exhibit. OSPF has been configured as a routing protocol on all routers in OSPF area 0. Based on the cost value of the links, which path will be selected by the SPF algorithm to forward traffic from router R4 to network A?

Select one of the following:

R4-R2-R1
R4-R3-R1
R4-R2-R3-R1
R4-R3-R2-R1

Explanation

Question 44 of 49

Which statement is true about ACLs that are applied to VTY lines on Cisco routers?

Select one of the following:

ACLs can be used to encrypt VTY transmissions.
ACLs are applied using the access-class command.
When ACLs are applied to VTY lines, the VTY password should be removed.
The ACL provides the flexibility for a specific user to login remotely from different locations with any IP address.

Explanation

Question 45 of 49

Refer to the exhibit. Which router or routers would be considered OSPF ABRs?

Select one of the following:

R1
R6, R8
R2, R6, R8
R2, R3, R4, R5
R8, R9, R10, R11
Bottom of Form

Explanation

Question 46 of 49

Refer to the exhibit. A network technician has added router R0 to an existing network that contains router R1. R0 is configured with EIGRP and is connected to R1 via the Fa0/0 interface of each router. After completing an analysis of the network, the technician notices that the routes to the networks that are supported by routers R0 and R1 are not being exchanged. What is a possible cause for this failure?

Select one of the following:

R0 was configured with the wrong autonomous system number.
FastEthernet interfaces on R0 are in a shutdown state.
Interface Fa0/0 on R0 is configured as a passive interface.
Interface Fa0/0 on R1 is configured as a passive interface.

Explanation

Question 47 of 49

In which scenario would PAT be the best choice?

Select one of the following:

when a single local address should be mapped to a single global address
when a single inside address should be mapped to multiple global addresses
when multiple inside addresses should be mapped to a large pool of global addresses
when multiple inside local addresses should be mapped to a single global address

Explanation

Question 48 of 49

What are three correct host addresses in the 172.16.0.0/17 network? (Choose three.)

Select one or more of the following:

172.16.0.255
172.16.16.16
172.16.127.127
172.16.128.1
172.17.1.1
172.18.1.1

Explanation

Question 49 of 49

Which subprotocol does PPP use to establish, maintain, test, and terminate a point-to-point link?

Select one of the following:

LCP
NCP
IPCP
IPXCP

Explanation

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CCNA Answers – CCNA Exam

Question 1 of 49

Refer to the exhibit. R1 and R2 are connected via serial interfaces. Both interfaces show that there is Layer 2 connectivity between them. The administrator verifies that CDP is operational; however, pings between the two interfaces are unsuccessful. What is the cause of this connectivity problem?

Select one of the following:

Explanation

Question 2 of 49

What are two benefits of using ACLs? (Choose two.)

Select one or more of the following:

Explanation

Question 3 of 49

Refer to the exhibit. A network support technician has been asked to set an IP address on one of the FastEthernet interfaces on a new router. What is causing the interface to reject the address?

Select one of the following:

Explanation

Question 4 of 49

Refer to the exhibit. What are the DR and the BDR on the network? (Choose two.)

Select one or more of the following:

Explanation

Question 5 of 49

What two types of information would a network administrator receive after excuting a show version command on a Cisco router? (Choose two.)

Select one or more of the following:

Explanation

Question 6 of 49

Refer to the exhibit. What is represented by the Null0 route for the 128.107.0.0 network?

Select one of the following:

Explanation

Question 7 of 49

Refer to the exhibit. EIGRP has been configured on all routers in the network. Router R1 cannot form a neighbor relationship with router R2. On the basis of the show ip protocols command output that is provided, what could be the cause of the problem?

Select one of the following:

Explanation

Question 8 of 49

What is the function of mutilink PPP?

Select one of the following:

Explanation

Question 9 of 49

After comparing a previous baseline to current network statistics, the network engineer has discovered a significant increase in unwarranted traffic to the extranet. Which two steps simplify administration and control the unwanted traffic? (Choose two.)

Select one or more of the following:

Explanation

Question 10 of 49

Refer to the exhibit. Router1 and Router2 are both running RIPv2 with autosummarization disabled. Which subnet mask will Router1 associate with network 192.168.4.16/28?

Select one of the following:

Explanation

Question 11 of 49

What are two WAN protocols that define parameters for data encapsulation? (Choose two.)

Select one or more of the following:

Explanation

Question 12 of 49

Which two STP states allow a switch to learn MAC addresses? (Choose two.)

Select one or more of the following:

Explanation

Question 13 of 49

What should be considered when designing an addressing scheme that uses private IP address space?

Select one of the following:

Explanation

Question 14 of 49

Which type of distance vector routing mechanism helps prevent the formation of loops by preventing routing information from exiting a router interface through the same interface on which it was received?

Select one of the following:

Explanation

Question 15 of 49

What is the purpose of assigning an IP address to a Layer 2 switch?

Select one of the following:

Explanation

Question 16 of 49

Refer to the exhibit. Assuming that all three routers are configured with the EIGRP routing protocol and sharing information, what information can be gathered from the show command output?

Select one of the following:

Explanation

Question 17 of 49

What do companies gain from the services performed at the enterprise edge?

Select one of the following:

Explanation

Question 18 of 49

A network administrator is creating an addressing scheme and has determined that the company network 192.168.1.0/24 will require 8 subnets with at least 25 hosts on each subnet. Which subnet mask will meet these requirements?

Select one of the following:

Explanation

Question 19 of 49

Refer to the exhibit. Which route will appear in the routing table?

Select one of the following:

Explanation

Question 20 of 49

Refer to the exhibit. A network administrator wishes to deny Internet access to all R2 LAN hosts, while allowing these hosts to reach all other devices on the company networks. Where should the ACL shown in the exhibit be placed to meet these requirements?

Refer to the exhibit. The network administrator has configured R1, R2, and R3 to use RIPv2, and the network is fully converged. The hosts on the internal network are able to access R2, but they are unable to access the Internet.
How can the administrator solve this problem?