OSPF Routing Protocol Practice Exam Questions

OSPF Network Configuration Review

Question 13

Refer to the exhibit. As part of an OSPF network, R1 and R2 are trying to become adjacent neighbors. Although it appears that the two systems are communicating, neither of the routing tables includes OSPF routes received from its neighbor. What could be responsible for this situation?

Answer: The interval timers on the routers do not match.

Question 14

Refer to the exhibit. What is the purpose of the value 128 displayed in bold?

Answer: It is the OSPF cost metric.

Question 15

Refer to the exhibit. What is the purpose of the set of commands added on router B?

Answer: It provides a stable OSPF router ID on router B.

Question 16

Refer to the exhibit. The command ip route 10.16.1.64 255.255.255.252 s0/0/0 is entered on the router. Why does the 10.16.1.64/30 network not appear in the routing table alongside the 10.16.1.64/27 network?

Answer: The router treats the 10.16.1.64/30 and 10.16.1.64/27 subnets as two different networks.

Question 17

What is the main difference between link-state protocols and distance vector protocols with regard to route calculation?

Answer: Distance vector protocols take existing routes from their neighbors and add to them. Link-state protocols independently calculate full routes.

Question 18

What range of networks are advertised in the OSPF updates by the command network 192.168.0.0 0.0.15.255 area 0?

Answer: 192.168.0.0/24 through 192.168.15.0/24.

Question 19

Refer to the exhibit. When establishing adjacency relationships, which IP address does a router use to send hello packets to router B?

Answer: 224.0.0.5

Question 20

Refer to the exhibit. Which router will be elected the DR and which will become the BDR?

Answer: R1 will be the DR and R3 will be the BDR.

Question 21

When compared with a distance vector routing protocol, what is a benefit of the hierarchical design approach used in large OSPF networks?

Answer: Isolation of network instability.

Question 22

What are two advantages of using a link-state routing protocol instead of a distance vector routing protocol? (Choose two.)

• Routers have direct knowledge of all links in the network and how they are connected.
• After the initial LSA flooding, routers generally require less bandwidth to communicate changes in a topology.

Question 23

If a network has converged, what is true about the relationship between the state database held by each router in the same OSPF area?

Question 24

Refer to the exhibit. RTRC was recently configured and is not sending the proper OSPF routes to RTRB, as shown in the routing table of RTRB. Based on RTRC settings, what is the most likely problem?

Answer: The OSPF routing configuration on RTRC has a network statement that is missing or incorrect.