CCNA 2 Final Exam

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Quizzes Created: 1 | Total Attempts: 258

Questions: 74 | Attempts: 258 | Updated: Mar 21, 2023

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Questions and Answers

1.

Refer to the exhibit. Given the topology shown in the exhibit, what three commands are needed to configure EIGRP on the Paris router? (Choose three.)
- A.
  
  Paris(config)# router eigrp 100
- B.
  
  Paris(config)# router eigrp
- C.
  
  Paris(config-router)# network 192.168.6.0
- D.
  
  Paris(config-router)# network 192.168.7.0
- E.
  
  Paris(config-router)# network 192.168.8.0
- F.
  
  Paris(config-router)# network 192.168.9.0
Correct Answer(s)
A. Paris(config)# router eigrp 100
D. Paris(config-router)# network 192.168.7.0
E. Paris(config-router)# network 192.168.8.0

Explanation
The correct answer is Paris(config)# router eigrp 100, Paris(config-router)# network 192.168.7.0, Paris(config-router)# network 192.168.8.0.

To configure EIGRP on the Paris router, the first command "Paris(config)# router eigrp 100" is used to enter the EIGRP configuration mode and specify the autonomous system number as 100.

The next two commands "Paris(config-router)# network 192.168.7.0" and "Paris(config-router)# network 192.168.8.0" are used to specify the network addresses that should participate in EIGRP routing. These commands enable EIGRP on the interfaces associated with the specified network addresses.

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2.

In a lab test environment, a router has learned about network 172.16.1.0 through four different dynamic routing processes. Which route will be used to reach this network?
- A.
  
  D 172.16.1.0/24 [90/2195456] via 192.168.200.1, 00:00:09, Serial0/0/0
- B.
  
  O 172.16.1.0/24 [110/1012] via 192.168.200.1, 00:00:22, Serial0/0/0
- C.
  
  R 172.16.1.0/24 [120/1] via 192.168.200.1, 00:00:17, Serial0/0/0
- D.
  
  I 172.16.1.0/24 [100/1192] via 192.168.200.1, 00:00:09, Serial0/0/0
Correct Answer
A. D 172.16.1.0/24 [90/2195456] via 192.168.200.1, 00:00:09, Serial0/0/0

Explanation
The route that will be used to reach network 172.16.1.0 is the one with the lowest administrative distance. In this case, the route with the lowest administrative distance is "D 172.16.1.0/24 [90/2195456] via 192.168.200.1, 00:00:09, Serial0/0/0". The "D" indicates that this route was learned through EIGRP, and the administrative distance of EIGRP is lower than the other routing processes (such as OSPF, RIP, or BGP) that may have advertised the same network. Therefore, this route will be chosen to reach network 172.16.1.0.

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3.

Which routing protocol maintains a topology table separate from the routing table?
- A.
  
  IGRP
- B.
  
  RIPv1
- C.
  
  RIPv2
- D.
  
  EIGRP
Correct Answer
D. EIGRP

Explanation
EIGRP (Enhanced Interior Gateway Routing Protocol) maintains a topology table separate from the routing table. The topology table contains detailed information about all available routes in the network, including metrics such as bandwidth, delay, reliability, and load. This separate table allows EIGRP to calculate the best path to a destination based on these metrics and update the routing table accordingly. By keeping the topology table separate, EIGRP can make more efficient and informed routing decisions, leading to improved network performance.

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4.

Refer to the exhibit. R1 and R2 are unable to establish an adjacency. What two configuration changes will correct the problem? (Choose two.)
- A.
  
  Set a lower priority on R2.
- B.
  
  Configure the routers in the same area.
- C.
  
  Set a lower cost on R2 compared to R1.
- D.
  
  Add a backup designated router to the network.
- E.
  
  Match the hello and dead timers on both routers.
Correct Answer(s)
B. Configure the routers in the same area.
E. Match the hello and dead timers on both routers.
5.

Which statement is true about the metrics used by routing protocols?
- A.
  
  A metric is a value used by a particular routing protocol to compare paths to remote networks.
- B.
  
  A common metric is used by all routing protocols.
- C.
  
  The metric with the highest value is installed in the routing table.
- D.
  
  The router may use only one parameter at a time to calculate the metric.
Correct Answer
A. A metric is a value used by a particular routing protocol to compare paths to remote networks.

Explanation
Routing protocols use metrics to determine the best path to forward network traffic. A metric is a value assigned to each path, which is used to compare the different paths to remote networks. This allows the router to select the most optimal path based on factors such as bandwidth, delay, reliability, or cost. Each routing protocol may use its own specific metric calculation algorithm, allowing for flexibility and customization. Therefore, the statement "A metric is a value used by a particular routing protocol to compare paths to remote networks" is true.

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6.

Refer to the exhibit. Although R2 is configured correctly, host A is unable to access the Internet. Which two static routes can be configured on R1 to enable Internet connectivity for host A? (Choose two.)
- A.
  
  Ip route 0.0.0.0 0.0.0.0 Fa0/0
- B.
  
  Ip route 0.0.0.0 0.0.0.0 Fa0/1
- C.
  
  Ip route 0.0.0.0 0.0.0.0 10.1.1.1
- D.
  
  Ip route 0.0.0.0 0.0.0.0 10.1.1.2
- E.
  
  Ip route 209.165.202.0 255.255.255.0 10.1.1.1
- F.
  
  Ip route 209.165.202.0 255.255.255.0 10.1.1.2
Correct Answer(s)
B. Ip route 0.0.0.0 0.0.0.0 Fa0/1
D. Ip route 0.0.0.0 0.0.0.0 10.1.1.2

Explanation
The correct answer is "ip route 0.0.0.0 0.0.0.0 Fa0/1" and "ip route 0.0.0.0 0.0.0.0 10.1.1.2". These two static routes can be configured on R1 to enable Internet connectivity for host A. The first static route directs all traffic with any destination IP address to the Fa0/1 interface, which is the interface connecting to the Internet. The second static route directs all traffic with any destination IP address to the next-hop IP address 10.1.1.2, which is the IP address of the next router in the network path towards the Internet.

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7.

Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this?
- A.
  
  The IP address of host A is incorrect.
- B.
  
  The default gateway of host A is incorrect.
- C.
  
  The Fa0/1 interfaces of the two routers are configured for different subnets.
- D.
  
  The subnet mask for the Fa0/0 interface of R1 is incorrect.
Correct Answer
C. The Fa0/1 interfaces of the two routers are configured for different subnets.

Explanation
The reason host A is unable to access the Internet is because the Fa0/1 interfaces of the two routers are configured for different subnets. This means that there is a mismatch in the network addresses between the routers, causing a connectivity issue for host A.

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8.

Refer to the exhibit. Two routers are unable to establish an adjacency. What is the possible cause for this?
- A.
  
  The two routers are connected on a multiaccess network.
- B.
  
  The hello and dead intervals are different on the two routers.
- C.
  
  They have different OSPF router IDs.
- D.
  
  They have different process IDs.
Correct Answer
B. The hello and dead intervals are different on the two routers.

Explanation
The possible cause for the two routers being unable to establish an adjacency is that the hello and dead intervals are different on the two routers. In OSPF, routers use hello packets to discover and establish adjacencies with neighboring routers. The hello interval determines how often hello packets are sent, while the dead interval determines how long a router waits to declare a neighbor as unreachable. If the hello and dead intervals are different on the two routers, they will not be able to synchronize and establish an adjacency.

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9.

Refer to the exhibit. R1 knows two routes, Path A and Path B, to the Ethernet network attached to R3. R1 learned Path A to network 10.2.0.0/16 from a static route and Path B to network 10.2.0.0/16 from EIGRP. Which route will R1 install in its routing table?
- A.
  
  Both routes are installed and load balancing occurs across both paths.
- B.
  
  The route via Path B is installed because the EIGRP route has the best metric to network 10.2.0.0/16.
- C.
  
  The route via Path A is installed because the static route has the best metric to network 10.2.0.0/16.
- D.
  
  The route via Path B is installed because the EIGRP route has the lowest administrative distance to network 10.2.0.0/16.
- E.
  
  The route via Path A is installed because the static route has the lowest administrative distance to network 10.2.0.0/16.
Correct Answer
E. The route via Path A is installed because the static route has the lowest administrative distance to network 10.2.0.0/16.

Explanation
The correct answer is that the route via Path A is installed because the static route has the lowest administrative distance to network 10.2.0.0/16. Administrative distance is a measure of the trustworthiness of a routing protocol, where a lower value indicates a higher level of trust. In this scenario, the static route has a lower administrative distance than the EIGRP route, so it is considered more reliable and will be installed in the routing table.

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10.

Refer to the exhibit. A ping between the serial interfaces of R1 and R2 is successful, but a ping between their FastEthernet interfaces fails. What is the reason for this problem?
- A.
  
  The FastEthernet interface of R1 is disabled.
- B.
  
  One of the default routes is configured incorrectly.
- C.
  
  A routing protocol is not configured on both routers.
- D.
  
  The default gateway has not been configured on both routers.
Correct Answer
B. One of the default routes is configured incorrectly.

Explanation
The reason for the problem is that one of the default routes is configured incorrectly. This means that the routing table on either R1 or R2 has a default route pointing to an incorrect next hop or destination. As a result, when the ping is sent from the FastEthernet interface, the router does not know where to send the traffic and the ping fails. However, when the ping is sent between the serial interfaces, the correct routes are used and the ping is successful.

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11.

Which router component is used to store the routing table?
- A.
  
  Flash
- B.
  
  NVRAM
- C.
  
  ROM
- D.
  
  SDRAM
Correct Answer
D. SDRAM

Explanation
SDRAM stands for Synchronous Dynamic Random Access Memory, and it is a type of computer memory that is used to store data temporarily. In the case of a router, SDRAM is used to store the routing table, which contains information about the various routes that the router can use to forward network traffic. The routing table is a crucial component of a router's operation, as it determines the most efficient path for data packets to travel through a network. Therefore, SDRAM plays a vital role in the functioning of a router by storing this important data.

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12.

Refer to the exhibit. Both routers are using the RIPv2 routing protocol and static routes are undefined. R1 can ping 192.168.2.1 and 10.1.1.2, but is unable to ping 192.168.4.1.What is the reason for the ping failure?
- A.
  
  The serial interface between two routers is down.
- B.
  
  R2 is not forwarding the routing updates.
- C.
  
  The 192.168.4.0 network is not included in the RIP configuration of R2.
- D.
  
  RIPv1 needs to be configured.
Correct Answer
C. The 192.168.4.0 network is not included in the RIP configuration of R2.

Explanation
The reason for the ping failure is that the 192.168.4.0 network is not included in the RIP configuration of R2. This means that R2 is not advertising the route to 192.168.4.1 to R1, causing the ping to fail.

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13.

What two routing protocols use a hierarchal network topology? (Choose two.)
- A.
  
  IS-IS
- B.
  
  EIGRP
- C.
  
  OSPF
- D.
  
  RIPv1
- E.
  
  RIPv2
Correct Answer(s)
A. IS-IS
C. OSPF

Explanation
IS-IS and OSPF are two routing protocols that use a hierarchical network topology. These protocols divide the network into multiple levels or areas, allowing for efficient routing and scalability. In a hierarchical topology, routers are organized into different levels or areas, with each level having its own set of routers and a designated hierarchy. This hierarchical structure helps in reducing the complexity of routing tables and improving the overall efficiency of the network. Both IS-IS and OSPF are widely used in large enterprise networks and internet service provider networks due to their ability to handle complex network topologies effectively.

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14.

Refer to the exhibit. Routers R1 and R2 are directly connected via their serial interfaces and are both running the EIGRP routing protocol. R1 and R2 can ping the directly connected serial interface of their neighbor, but they cannot form an EIGRP neighbor adjacency.
- A.
  
  What action should be taken to solve this problem?
- B.
  
  Enable the serial interfaces of both routers.
- C.
  
  Configure EIGRP to send periodic updates.
- D.
  
  Configure the same hello interval between the routers.
- E.
  
  Configure both routers with the same EIGRP process ID.
Correct Answer
E. Configure both routers with the same EIGRP process ID.

Explanation
The routers R1 and R2 are directly connected and running the EIGRP routing protocol. However, they are unable to form an EIGRP neighbor adjacency. This issue can be resolved by configuring both routers with the same EIGRP process ID. The EIGRP process ID is used to identify the EIGRP routing process, and routers can only form an adjacency if they have the same process ID configured. Therefore, configuring both routers with the same EIGRP process ID will allow them to form an EIGRP neighbor adjacency.

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15.

Refer to the exhibit. What information can be determined from the highlighted output?
- A.
  
  Automatic summarization is disabled.
- B.
  
  The 172.30.200.16/28 network is one hop away from R1.
- C.
  
  A classful routing protocol is being used.
- D.
  
  R1 is originating the route 172.30.200.32/28.
Correct Answer
A. Automatic summarization is disabled.

Explanation
The highlighted output indicates that automatic summarization is disabled. This means that the router is not automatically summarizing routes at network boundaries. Instead, it is advertising the specific routes.

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16.

Refer to the exhibit. A network administrator wants to reduce the size of the routing table of R1. Which partial routing table entry in R1 represents the route summary for R2, without including any additional subnets?
- A.
  
  10.0.0.0/16 is subnetted, 1 subnets D 10.5.0.0[90/205891] via 192.168.1.2, S0/0/0
- B.
  
  10.0.0.0/24 is subnetted, 4 subnets D 10.5.0.0[90/205198] via 192.168.1.2, S0/0/0
- C.
  
  10.0.0.0/22 is subnetted, 1 subnets D 10.5.0.0[90/205901] via 192.168.1.2, S0/0/0
- D.
  
  10.0.0.0/8 is subnetted, 4 subnets D 10.5.0.0[90/205001] via 192.168.1.2, S0/0/0
Correct Answer
C. 10.0.0.0/22 is subnetted, 1 subnets D 10.5.0.0[90/205901] via 192.168.1.2, S0/0/0

Explanation
The correct answer is 10.0.0.0/22 is subnetted, 1 subnets. This entry represents the route summary for R2 because it is the only entry that has a subnet mask of /22, which includes all the subnets of R2 without including any additional subnets. The other entries have different subnet masks and include additional subnets, so they do not represent the route summary for R2.

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17.

Refer to the exhibit. All routers are running RIPv1. The two networks 10.1.1.0/29 and 10.1.1.16/29 are unable to access each other. What can be the cause of this problem?
- A.
  
  Because RIPv1 is a classless protocol, it does not support this access.
- B.
  
  RIPv1 does not support discontiguous networks.
- C.
  
  RIPv1 does not support load balancing.
- D.
  
  RIPv1 does not support automatic summarization.
Correct Answer
B. RIPv1 does not support discontiguous networks.

Explanation
RIPv1 does not support discontiguous networks. This means that if there are multiple networks that are not directly connected, RIPv1 will not be able to route traffic between them. In this scenario, the two networks 10.1.1.0/29 and 10.1.1.16/29 are not directly connected, so RIPv1 will not be able to establish a route between them. This is the likely cause of the problem where the two networks are unable to access each other.

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18.

Refer to the exhibit. A network administrator has enabled RIP on routers B and C in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A?
- A.
  
  A(config)# router rip A(config-router)# passive-interface S0/0
- B.
  
  B(config)# router rip B(config-router)# network 192.168.25.48 B(config-router)# network 192.168.25.64
- C.
  
  A(config)# router rip A(config-router)# no network 192.168.25.32
- D.
  
  B(config)# router rip B(config-router)# passive-interface S0/0
- E.
  
  A(config)# no router rip
Correct Answer
D. B(config)# router rip B(config-router)# passive-interface S0/0

Explanation
The command "B(config)# router rip B(config-router)# passive-interface S0/0" will prevent RIP updates from being sent to Router A by configuring the interface S0/0 as passive. A passive interface does not send or receive routing updates. Therefore, by configuring S0/0 as passive, RIP updates will not be sent from Router B to Router A.

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19.

Refer to the exhibit. A network administrator has configured R1 as shown, and all interfaces are functioning correctly. A ping from R1 to 172.16.1.1 fails. What could be the cause of this problem?
- A.
  
  The serial interface on R1 is configured incorrectly.
- B.
  
  The default route is configured incorrectly.
- C.
  
  The default-information originate command must be issued on R1.
- D.
  
  Autosummarization must be disabled on R1.
Correct Answer
B. The default route is configured incorrectly.

Explanation
The default route is configured incorrectly. This means that R1 does not have a route to forward the packet to the destination network 172.16.1.1. As a result, the ping fails because R1 does not know where to send the packet. To resolve this issue, the network administrator should check the default route configuration on R1 and make sure it is pointing to the correct next-hop or exit interface.

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20.

A router has learned two equal cost paths to a remote network via the EIGRP and RIP protocols. Both protocols are using their default configurations. Which path to the remote network will be installed in the routing table?
- A.
  
  The path learned via EIGRP
- B.
  
  The path learned via RIP
- C.
  
  The path with the highest metric value
- D.
  
  Both paths with load balancing
Correct Answer
A. The path learned via EIGRP

Explanation
When a router learns multiple paths to a remote network with equal cost, it will choose the path learned via the routing protocol with the lowest administrative distance. In this case, EIGRP has a lower administrative distance than RIP, so the path learned via EIGRP will be installed in the routing table.

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21.

Refer to the exhibit. What is the meaning of the highlighted value 2?
- A.
  
  It is the administrative distance of the routing protocol.
- B.
  
  It is the number of hops between R2 and the 192.168.8.0/24 network.
- C.
  
  It is the value used by the DUAL algorithm to determine the bandwidth for the link.
- D.
  
  It is the convergence time measured in seconds.
Correct Answer
B. It is the number of hops between R2 and the 192.168.8.0/24 network.

Explanation
The highlighted value 2 represents the number of hops between R2 and the 192.168.8.0/24 network.

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22.

Refer to the exhibit. Based on the output from the show running-config and debug ip rip commands, what are two of the routes that are added to the routing table of R1? (Choose two.)
- A.
  
  R 192.168.1.0/24 [120/1] via 172.16.2.1, 00:00:24, Serial0/0/1
- B.
  
  R 192.168.100.0/24 [120/1] via 172.16.1.1, 00:00:24, Serial0/0/0
- C.
  
  S 192.168.1.0/24 [1/0] via FastEthernet0/0
- D.
  
  R 192.168.9.0/24 [120/1] via 172.16.2.1, 00:00:24, Serial0/0/0
- E.
  
  R 192.168.2.0/24 [120/1] via 172.16.1.2, 00:00:24, Serial0/0/0
Correct Answer(s)
A. R 192.168.1.0/24 [120/1] via 172.16.2.1, 00:00:24, Serial0/0/1
B. R 192.168.100.0/24 [120/1] via 172.16.1.1, 00:00:24, Serial0/0/0

Explanation
Based on the output, the two routes that are added to the routing table of R1 are:

1. R 192.168.1.0/24 [120/1] via 172.16.2.1, 00:00:24, Serial0/0/1 - This route indicates that the network 192.168.1.0/24 is reachable via the next hop IP address 172.16.2.1 through the Serial0/0/1 interface.

2. R 192.168.100.0/24 [120/1] via 172.16.1.1, 00:00:24, Serial0/0/0 - This route indicates that the network 192.168.100.0/24 is reachable via the next hop IP address 172.16.1.1 through the Serial0/0/0 interface.

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23.

Refer to the exhibit. Routers R1 and R3 use different routing protocols with default administrative distance values. All devices are properly configured and the destination network is advertised by both protocols.
- A.
  
  Which path will be used to transmit the data packets between PC1 and PC2?
- B.
  
  The packets will travel via R2-R1.
- C.
  
  The packets will travel via R2-R3.
- D.
  
  The traffic will be load-balanced between two paths — via R2-R1 and via R2-R3.
- E.
  
  The packets will travel via R2-R3, and the other path via R2-R1 will be retained as the backup path.
Correct Answer
B. The packets will travel via R2-R1.

Explanation
The packets will travel via R2-R1 because the exhibit states that R1 and R3 use different routing protocols with default administrative distance values. This means that R1 will have a lower administrative distance than R3, making it the preferred path for routing the packets.

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24.

What are two functions of a router? (Choose two.)
- A.
  
  It forwards data packets toward their destination.
- B.
  
  It forwards the packet to the destination if the TTL value is 0.
- C.
  
  It changes the destination IP address of data packets before forwarding them to an exit interface.
- D.
  
  It determines the best path based on the destination MAC address.
- E.
  
  It acts as an intersection between multiple IP networks.
Correct Answer(s)
A. It forwards data packets toward their destination.
E. It acts as an intersection between multiple IP networks.

Explanation
A router has two main functions. Firstly, it forwards data packets towards their destination by examining the destination IP address and using routing tables to determine the best path for the packets to take. Secondly, it acts as an intersection between multiple IP networks by connecting different networks and allowing them to communicate with each other.

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25.

Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are displayed. All routers are operational and pings are not blocked on this network. Which ping will fail?
- A.
  
  From R1 to 172.16.1.1
- B.
  
  From R1 to 192.168.3.1
- C.
  
  From R2 to 192.168.1.1
- D.
  
  From R2 to 192.168.3.1
Correct Answer
B. From R1 to 192.168.3.1

Explanation
The ping from R1 to 192.168.3.1 will fail because there is no route to reach that destination in R1's routing table.

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26.

A network administrator needs to assign the very last usable IP address in the 172.24.64.0/18 network range to the router interface that serves this LAN. Which IP address should the administrator configure on the interface?
- A.
  
  172.16.128.154/18
- B.
  
  172.16.255.254/18
- C.
  
  172.24.64.254/18
- D.
  
  172.24.127.254/18
Correct Answer
D. 172.24.127.254/18

Explanation
The given network range is 172.24.64.0/18, which means that the subnet mask is 18 bits long. This allows for a total of 2^18 - 2 = 16382 usable IP addresses. The last usable IP address in this range would be the highest IP address within the subnet. In this case, the highest IP address would be 172.24.127.254/18, as it falls within the subnet and is the last usable IP address.

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27.

Which two statements are true about the EIGRP successor route? (Choose two.) It is saved in the topology table for use if the primary route fails.
- A.
  
  It may be backed up by a feasible successor route.
- B.
  
  It is used by EIGRP to forward traffic to the destination.
- C.
  
  It is flagged as active in the routing table.
- D.
  
  After the discovery process has occurred, the successor route is stored in the neighbor table.
Correct Answer(s)
A. It may be backed up by a feasible successor route.
B. It is used by EIGRP to forward traffic to the destination.

Explanation
The EIGRP successor route may be backed up by a feasible successor route, which provides a backup path in case the primary route fails. The successor route is also used by EIGRP to forward traffic to the destination, making it an active route in the routing table.

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28.

Refer to the exhibit. An administrator is adding a new subnet of 50 hosts to R3. Which subnet address should be used for the new subnet that provides enough addresses while wasting a minimum of addresses?
- A.
  
  192.168.1.0/24
- B.
  
  192.168.1.48 /28
- C.
  
  192.168.1.32/27
- D.
  
  192.168.1.64/26
Correct Answer
D. 192.168.1.64/26

Explanation
The subnet 192.168.1.64/26 should be used for the new subnet. This subnet provides enough addresses for 62 hosts (64 addresses in total) while wasting a minimum of addresses. The other subnets have fewer available addresses or waste more addresses.

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29.

Refer to the exhibit. Which statement is true concerning the routing configuration?
- A.
  
  Using dynamic routing instead of static routing would have required fewer configuration steps.
- B.
  
  The 10.1.1.0/24 and 10.1.2.0/24 routes have adjacent boundaries and should be summarized.
- C.
  
  Packets routed to the R2 Fast Ethernet interface require two routing table lookups.
- D.
  
  The static route will not work correctly.
Correct Answer
C. Packets routed to the R2 Fast Ethernet interface require two routing table lookups.

Explanation
The correct answer is "Packets routed to the R2 Fast Ethernet interface require two routing table lookups." This is because the exhibit shows that there are two possible paths to reach the 10.1.1.0/24 network - one through R1 and one through R3. Therefore, when a packet needs to be routed to the R2 Fast Ethernet interface, the router will need to perform two routing table lookups to determine the best path to take.

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30.

Refer to the exhibit. Which statement is true about router R2?
- A.
  
  The routing table content indicates that interface S0/0/0 is administratively down.
- B.
  
  The route for 172.16.1.0 is a static route.
- C.
  
  A packet that is destined for a host on the 172.16.3.0 network is forwarded without performing a routing table lookup.
- D.
  
  The packets that are routed to network 172.16.1.0 require two routing table lookups.
Correct Answer
D. The packets that are routed to network 172.16.1.0 require two routing table lookups.

Explanation
The routing table content indicates that interface S0/0/0 is administratively down. The exhibit shows that the interface S0/0/0 is flagged as "administratively down" in the routing table. This means that the interface has been manually disabled, either by the network administrator or due to a configuration issue. This prevents any traffic from being sent or received through that interface. Therefore, the statement "The routing table content indicates that interface S0/0/0 is administratively down" is true.

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31.

What command would the network administrator apply to a router that is running OSPF to advertise the entire range of addresses included in 172.16.0.0/19 in area 0?
- A.
  
  R1(config-router)# network 172.16.0.0 0.0.0.255 area 0
- B.
  
  R1(config-router)# network 172.16.0.0 0.0.3.255 area 0
- C.
  
  R1(config-router)# network 172.16.0.0 0.0.15.255 area 0
- D.
  
  R1(config-router)# network 172.16.0.0 0.0.31.255 area 0
Correct Answer
D. R1(config-router)# network 172.16.0.0 0.0.31.255 area 0

Explanation
The correct answer is "R1(config-router)# network 172.16.0.0 0.0.31.255 area 0". This command is used to advertise the entire range of addresses included in the subnet 172.16.0.0/19 in OSPF area 0. The wildcard mask 0.0.31.255 is used to specify the range of addresses to be advertised, which includes all addresses from 172.16.0.0 to 172.16.31.255.

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32.

How does route poisoning prevent routing loops?
- A.
  
  New routing updates are ignored until the network has converged.
- B.
  
  Failed routes are advertised with a metric of infinity.
- C.
  
  A route is marked as unavailable when its Time to Live is exceeded.
- D.
  
  The unreachable route is cleared from the routing table after the invalid timer expires.
Correct Answer
B. Failed routes are advertised with a metric of infinity.

Explanation
Failed routes are advertised with a metric of infinity. This prevents routing loops by informing other routers that the route is no longer available and should not be used for forwarding packets. By assigning a metric of infinity to the failed route, it becomes an unattractive option for routing, ensuring that packets do not get trapped in a loop and preventing unnecessary traffic congestion.

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33.

Refer to the exhibit. A router learns a route to the 192.168.6.0 network, as shown in the output of the show ip rip database command. However, upon running the show ip route command, the network administrator sees that the router has installed a different route to the 192.168.6.0 network learned via EIGRP. What could be the reason for the missing RIP route?
- A.
  
  Compared to RIP, EIGRP has a lower administrative distance.
- B.
  
  Compared to EIGRP, RIP has a higher metric value for the route.
- C.
  
  Compared to RIP, the EIGRP route has fewer hops.
- D.
  
  Compared to RIP, EIGRP has a faster update timer.
Correct Answer
A. Compared to RIP, EIGRP has a lower administrative distance.

Explanation
The reason for the missing RIP route could be that EIGRP has a lower administrative distance compared to RIP. Administrative distance is a measure of the trustworthiness of a routing protocol, where a lower value indicates a higher priority. In this case, the router has chosen to install the route learned via EIGRP because it considers EIGRP to be more reliable and trustworthy than RIP. Therefore, it prioritizes the EIGRP route over the RIP route in its routing table.

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34.

Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.)
- A.
  
  10.0.0.0/8
- B.
  
  64.100.0.0/16
- C.
  
  128.107.0.0/16
- D.
  
  172.16.40.0/24
- E.
  
  192.168.1.0/24
- F.
  
  192.168.2.0/24
Correct Answer(s)
A. 10.0.0.0/8
F. 192.168.2.0/24

Explanation
The router will need to perform a recursive lookup for packets destined to the 10.0.0.0/8 network because it is a classful network address and the router needs to determine the specific subnet within that network. Additionally, the router will need to perform a recursive lookup for packets destined to the 192.168.2.0/24 network because it is a private IP address and the router needs to determine the specific subnet within that network.

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35.

Which statement is true about the RIPv1 protocol?
- A.
  
  It is a link-state routing protocol.
- B.
  
  It excludes subnet information from the routing updates.
- C.
  
  It uses the DUAL algorithm to insert backup routes into the topology table.
- D.
  
  It uses classless routing as the default method on the router.
Correct Answer
B. It excludes subnet information from the routing updates.

Explanation
RIPv1 is an outdated routing protocol that does not include subnet information in its routing updates. This means that it does not support variable-length subnet masking (VLSM) and can only advertise network prefixes without specifying the subnet mask. This limitation makes RIPv1 less efficient and less flexible compared to modern routing protocols that support classless routing and VLSM.

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36.

All routers in a network are configured in a single OSPF area with the same priority value. No loopback interface has been set on any of the routers. Which secondary value will the routers use to determine the router ID?
- A.
  
  The highest MAC address among the active interfaces of the network will be used.
- B.
  
  There will be no router ID until a loopback interface is configured.
- C.
  
  The highest IP address among the active FastEthernet interfaces that are running OSPF will be used.
- D.
  
  The highest IP address among the active interfaces will be used.
Correct Answer
D. The highest IP address among the active interfaces will be used.

Explanation
The router ID is a unique identifier used by routers in OSPF to identify themselves. In this scenario, since no loopback interface has been set on any of the routers, the routers will use the highest IP address among the active interfaces to determine the router ID. This means that the router with the highest IP address among its active interfaces will be chosen as the router ID.

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37.

Refer to the exhibit. Router R2 is configured properly and all interfaces are functional. Router R1 has been installed recently. Host A is unable to ping host B. Which procedure can resolve this problem?
- A.
  
  Configure a static route on R1 using the IP address of the serial interface on R1.
- B.
  
  Configure a default route on R1 with the exit interface Fa0/0 on R1.
- C.
  
  Configure a static route on R1 using the IP address of S0/0/0 on R2.
- D.
  
  Configure a default route on R1 using the IP address of Fa0/0 on R2.
Correct Answer
C. Configure a static route on R1 using the IP address of S0/0/0 on R2.

Explanation
The correct answer is to configure a static route on R1 using the IP address of S0/0/0 on R2. This is because the problem is that host A is unable to ping host B, which suggests a connectivity issue between the two routers. By configuring a static route on R1 using the IP address of S0/0/0 on R2, R1 will know how to reach the network connected to R2 and establish the necessary connectivity for host A to ping host B.

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38.

Which three statements describe the operation of routing with EIGRP? (Choose three.)
- A.
  
  As new neighbors are discovered, entries are placed in a neighbor table.
- B.
  
  If the feasible successor has a higher advertised cost than the current successor route, then it becomes the primary route.
- C.
  
  If hello packets are not received within the hold time, DUAL must recalculate the topology.
- D.
  
  The reported distance is the distance to a destination as advertised by a neighbor.
- E.
  
  EIGRP maintains full knowledge of the network topology in the topology table and exchanges full routing information with neighboring routers in every update.
- F.
  
  EIGRP builds one routing table that contains routes for all configured routed protocols.
Correct Answer(s)
A. As new neighbors are discovered, entries are placed in a neighbor table.
C. If hello packets are not received within the hold time, DUAL must recalculate the topology.
D. The reported distance is the distance to a destination as advertised by a neighbor.

Explanation
When using EIGRP for routing, three statements describe its operation. First, as new neighbors are discovered, entries are placed in a neighbor table. This table keeps track of neighboring routers and their IP addresses. Second, if hello packets are not received within the hold time, DUAL (Diffusing Update Algorithm) must recalculate the network's topology. This ensures that the routing information remains up to date. Lastly, the reported distance is the distance to a destination as advertised by a neighbor. This information is used by EIGRP to determine the best path for routing.

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39.

Refer to the exhibit. The network administrator is planning IP addressing of a new network. What part of this addressing scheme must be changed to allow communication between host A and the server?
- A.
  
  The IP address of the server
- B.
  
  The default gateway of host A
- C.
  
  The IP address of host A
- D.
  
  The default gateway of the server
Correct Answer
A. The IP address of the server

Explanation
To allow communication between host A and the server, the IP address of the server must be changed. The IP address is the unique identifier of a device on a network, and in order for host A to communicate with the server, they must be on the same network and have compatible IP addresses. By changing the IP address of the server, it can be placed on the same network as host A, enabling communication between them.

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40.

Which two statements are correct about the split horizon with poison reverse method of routing loop prevention? (Choose two.)
- A.
  
  It is enabled by default on all Cisco IOS implementations.
- B.
  
  It assigns a value that represents an infinite metric to the poisoned route.
- C.
  
  It sends back the poisoned route update to the same interface from where it was received.
- D.
  
  It instructs routers to hold all changes that might affect routes, for a specified period of time.
- E.
  
  It limits the number of hops a packet can traverse through the network before it is discarded.
Correct Answer(s)
B. It assigns a value that represents an infinite metric to the poisoned route.
C. It sends back the poisoned route update to the same interface from where it was received.

Explanation
The split horizon with poison reverse method of routing loop prevention assigns a value that represents an infinite metric to the poisoned route. This means that the route is considered unreachable and will not be used for forwarding packets. Additionally, it sends back the poisoned route update to the same interface from where it was received. This helps to inform the neighboring routers about the unreachability of the route and prevents them from using it.

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41.

What are two tasks that must be completed before two routers can use OSPF to form a neighbor adjacency? (Choose two.)
- A.
  
  The routers must elect a designated router.
- B.
  
  The routers must agree on the network type.
- C.
  
  The routers must use the same dead interval.
- D.
  
  The routers must exchange link state requests.
- E.
  
  The routers must exchange database description packets.
Correct Answer(s)
B. The routers must agree on the network type.
C. The routers must use the same dead interval.

Explanation
Before two routers can use OSPF to form a neighbor adjacency, they must agree on the network type. This is important because OSPF supports different network types such as point-to-point, broadcast, and non-broadcast multi-access, and the routers need to have the same understanding of the network type in order to establish a neighbor relationship. Additionally, the routers must use the same dead interval, which is the amount of time that a router waits before declaring a neighboring router as dead. Having the same dead interval ensures that both routers have the same timing for detecting and responding to router failures.

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42.

Which two components are used to determine the router ID in the configuration of the OSPF routing process? (Choose two.)
- A.
  
  The IP address of the first FastEthernet interface
- B.
  
  The highest IP address of any logical interface
- C.
  
  The highest IP address of any physical interface
- D.
  
  The default gateway IP address
- E.
  
  The priority value of 1 on any physical interface
Correct Answer(s)
B. The highest IP address of any logical interface
C. The highest IP address of any physical interface

Explanation
The router ID in the configuration of the OSPF routing process is determined by the highest IP address of any logical interface and the highest IP address of any physical interface. The router ID is a unique identifier assigned to each router in an OSPF network and is used to identify the router within the OSPF domain. By selecting the highest IP address of any logical interface and the highest IP address of any physical interface, it ensures that the router ID is unique and consistent across the network.

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43.

What is the function of the OSPF LSR packet?
- A.
  
  It is used to confirm the receipt of LSUs.
- B.
  
  It is used to establish and maintain adjacency with other OSPF routers.
- C.
  
  It is used by the receiving routers to request more information about any entry in the DBD.
- D.
  
  It is used to check the database synchronization between routers.
Correct Answer
C. It is used by the receiving routers to request more information about any entry in the DBD.

Explanation
The OSPF LSR (Link State Request) packet is used by receiving routers to request more information about any entry in the DBD (Database Description). This packet is sent when a receiving router wants more detailed information about a specific entry in the database. It helps in the synchronization and exchange of link state information between OSPF routers.

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44.

Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2?
- A.
  
  192.168.1.0/24
- B.
  
  192.168.0.0/24
- C.
  
  192.168.0.0/22
- D.
  
  192.168.1.0/22
Correct Answer
C. 192.168.0.0/22

Explanation
R1 should use the summarization 192.168.0.0/22 to advertise its networks to R2. This is because the /22 prefix length includes both the 192.168.0.0/24 and 192.168.1.0/24 networks. By using this summarization, R1 can advertise a single route to R2 that covers both of its networks, reducing the number of routes in R2's routing table.

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45.

Refer to the exhibit. The hosts that are connected to R2 are unable to ping the hosts that are connected to R1. How can this problem be resolved?
- A.
  
  Configure the router ID on both routers.
- B.
  
  Configure the R2 router interfaces for area 0.
- C.
  
  Configure a loopback interface on both routers.
- D.
  
  Configure the proper subnet masks on the router interfaces.
Correct Answer
B. Configure the R2 router interfaces for area 0.

Explanation
To resolve the issue of hosts connected to R2 being unable to ping the hosts connected to R1, the problem can be resolved by configuring the R2 router interfaces for area 0. This suggests that the routers are using OSPF (Open Shortest Path First) as the routing protocol, and by configuring the R2 router interfaces for area 0, they will be able to establish communication and exchange routing information with the routers in area 0 (which includes R1). This will enable the hosts connected to R2 to successfully ping the hosts connected to R1.

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46.

Refer to the exhibit. Which router is advertising subnet 172.16.1.32/28?
- A.
  
  Router1
- B.
  
  Router2
- C.
  
  Router3
- D.
  
  Router4
Correct Answer
D. Router4

Explanation
The correct answer is Router4 because it is the only router that is advertising the subnet 172.16.1.32/28. The other routers are not mentioned in the exhibit, so we cannot determine if they are advertising this subnet or not.

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47.

Refer to the exhibit. All router interfaces are configured with an IP address and are operational. If no routing protocols or static routes are configured, what information will be included in the show ip route command output for router A?
- A.
  
  All of the 192.168.x.0 networks will be in the routing table.
- B.
  
  Routes to networks 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24 will be in the routing table.
- C.
  
  The routing table will be empty because routes and dynamic routes have not been configured.
- D.
  
  A default route is automatically installed in the routing table to allow connectivity between the networks.
Correct Answer
B. Routes to networks 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24 will be in the routing table.

Explanation
If no routing protocols or static routes are configured, the only routes that will be included in the show ip route command output for router A are the directly connected networks. In this case, the router interfaces are configured with IP addresses in the 192.168.x.0 range, so the routes to networks 192.168.1.0/24, 192.168.2.0/24, and 192.168.3.0/24 will be in the routing table. Other networks outside of this range will not be included in the routing table.

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48.

When a router boots, what is the default order to locate the Cisco IOS if there is no boot system command?
- A.
  
  ROM, TFTP server, flash
- B.
  
  Flash, TFTP server, ROM
- C.
  
  Flash, NVRAM, TFTP server
- D.
  
  NVRAM, TFTP server, flash
Correct Answer
B. Flash, TFTP server, ROM

Explanation
When a router boots, it first checks the flash memory to locate the Cisco IOS image. If it is not found in the flash memory, the router then tries to locate the IOS image from a TFTP server. If the IOS image is still not found, the router finally looks for it in the ROM. Therefore, the correct order to locate the Cisco IOS if there is no boot system command is flash, TFTP server, ROM.

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49.

Which two statements are true for link-state routing protocols? (Choose two.)
- A.
  
  Routers that run a link-state protocol can establish a complete topology of the network.
- B.
  
  Routers in a multipoint network that run a link-state protocol can exchange routing tables.
- C.
  
  Routers use only hop count for routing decisions.
- D.
  
  The shortest path first algorithm is used.
- E.
  
  Split horizon is used to avoid routing loops.
Correct Answer(s)
A. Routers that run a link-state protocol can establish a complete topology of the network.
D. The shortest path first algorithm is used.

Explanation
Link-state routing protocols, such as OSPF and IS-IS, allow routers to establish a complete topology of the network by exchanging information about their directly connected links. This enables routers to have a detailed understanding of the network's layout and the status of each link. Additionally, these protocols use the shortest path first algorithm to determine the best path for routing packets. This algorithm calculates the shortest path based on various metrics, such as link cost, bandwidth, and delay. Therefore, the two true statements for link-state routing protocols are that routers can establish a complete network topology and the shortest path first algorithm is used.

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50.

Refer to the exhibit. While trying to diagnose a routing problem in the network, the network administrator runs the debug ip rip command. What can be determined from the output of this command?
- A.
  
  The router will be unable to ping 192.168.1.2.
- B.
  
  The router has two interfaces that participate in the RIP process.
- C.
  
  The router will forward the updates for 192.168.1.0 on interface Serial0/0/1.
- D.
  
  The router is not originating routes for 172.16.1.0.
Correct Answer
D. The router is not originating routes for 172.16.1.0.

Explanation
From the output of the "debug ip rip" command, it can be determined that the router is not originating routes for the 172.16.1.0 network. This means that the router is not advertising or announcing any routes for the 172.16.1.0 network to other routers in the network.

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Quiz Edited by
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Oct 23, 2011

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CCNA 2 Final Exam

Refer to the exhibit. Given the topology shown in the exhibit, what three commands are needed to configure EIGRP on the Paris router? (Choose three.)

In a lab test environment, a router has learned about network 172.16.1.0 through four different dynamic routing processes. Which route will be used to reach this network?

Which routing protocol maintains a topology table separate from the routing table?

Refer to the exhibit. R1 and R2 are unable to establish an adjacency. What two configuration changes will correct the problem? (Choose two.)

Which statement is true about the metrics used by routing protocols?

Refer to the exhibit. Although R2 is configured correctly, host A is unable to access the Internet. Which two static routes can be configured on R1 to enable Internet connectivity for host A? (Choose two.)

Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this?

Refer to the exhibit. Two routers are unable to establish an adjacency. What is the possible cause for this?

Refer to the exhibit. R1 knows two routes, Path A and Path B, to the Ethernet network attached to R3. R1 learned Path A to network 10.2.0.0/16 from a static route and Path B to network 10.2.0.0/16 from EIGRP. Which route will R1 install in its routing table?

Refer to the exhibit. A ping between the serial interfaces of R1 and R2 is successful, but a ping between their FastEthernet interfaces fails. What is the reason for this problem?

Which router component is used to store the routing table?

Refer to the exhibit. Both routers are using the RIPv2 routing protocol and static routes are undefined. R1 can ping 192.168.2.1 and 10.1.1.2, but is unable to ping 192.168.4.1.What is the reason for the ping failure?

What two routing protocols use a hierarchal network topology? (Choose two.)

Refer to the exhibit. Routers R1 and R2 are directly connected via their serial interfaces and are both running the EIGRP routing protocol. R1 and R2 can ping the directly connected serial interface of their neighbor, but they cannot form an EIGRP neighbor adjacency.

Refer to the exhibit. What information can be determined from the highlighted output?

Refer to the exhibit. A network administrator wants to reduce the size of the routing table of R1. Which partial routing table entry in R1 represents the route summary for R2, without including any additional subnets?

Refer to the exhibit. All routers are running RIPv1. The two networks 10.1.1.0/29 and 10.1.1.16/29 are unable to access each other. What can be the cause of this problem?

Refer to the exhibit. A network administrator has enabled RIP on routers B and C in the network diagram. Which of the following commands will prevent RIP updates from being sent to Router A?

Refer to the exhibit. A network administrator has configured R1 as shown, and all interfaces are functioning correctly. A ping from R1 to 172.16.1.1 fails. What could be the cause of this problem?

A router has learned two equal cost paths to a remote network via the EIGRP and RIP protocols. Both protocols are using their default configurations. Which path to the remote network will be installed in the routing table?

Refer to the exhibit. What is the meaning of the highlighted value 2?

Refer to the exhibit. Based on the output from the show running-config and debug ip rip commands, what are two of the routes that are added to the routing table of R1? (Choose two.)

Refer to the exhibit. Routers R1 and R3 use different routing protocols with default administrative distance values. All devices are properly configured and the destination network is advertised by both protocols.

What are two functions of a router? (Choose two.)

Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are displayed. All routers are operational and pings are not blocked on this network. Which ping will fail?

A network administrator needs to assign the very last usable IP address in the 172.24.64.0/18 network range to the router interface that serves this LAN. Which IP address should the administrator configure on the interface?

Which two statements are true about the EIGRP successor route? (Choose two.) It is saved in the topology table for use if the primary route fails.

Refer to the exhibit. An administrator is adding a new subnet of 50 hosts to R3. Which subnet address should be used for the new subnet that provides enough addresses while wasting a minimum of addresses?

Refer to the exhibit. Which statement is true concerning the routing configuration?

Refer to the exhibit. Which statement is true about router R2?

What command would the network administrator apply to a router that is running OSPF to advertise the entire range of addresses included in 172.16.0.0/19 in area 0?

How does route poisoning prevent routing loops?

Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.)

Which statement is true about the RIPv1 protocol?

All routers in a network are configured in a single OSPF area with the same priority value. No loopback interface has been set on any of the routers. Which secondary value will the routers use to determine the router ID?

Refer to the exhibit. Router R2 is configured properly and all interfaces are functional. Router R1 has been installed recently. Host A is unable to ping host B. Which procedure can resolve this problem?

Which three statements describe the operation of routing with EIGRP? (Choose three.)

Refer to the exhibit. The network administrator is planning IP addressing of a new network. What part of this addressing scheme must be changed to allow communication between host A and the server?

Which two statements are correct about the split horizon with poison reverse method of routing loop prevention? (Choose two.)

What are two tasks that must be completed before two routers can use OSPF to form a neighbor adjacency? (Choose two.)

Which two components are used to determine the router ID in the configuration of the OSPF routing process? (Choose two.)

What is the function of the OSPF LSR packet?

Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2?

Refer to the exhibit. The hosts that are connected to R2 are unable to ping the hosts that are connected to R1. How can this problem be resolved?

Refer to the exhibit. Which router is advertising subnet 172.16.1.32/28?

Refer to the exhibit. All router interfaces are configured with an IP address and are operational. If no routing protocols or static routes are configured, what information will be included in the show ip route command output for router A?

When a router boots, what is the default order to locate the Cisco IOS if there is no boot system command?

Which two statements are true for link-state routing protocols? (Choose two.)

Refer to the exhibit. While trying to diagnose a routing problem in the network, the network administrator runs the debug ip rip command. What can be determined from the output of this command?