The company and the company network have both been growing rapidly. Multiple adds, moves and changes have been applied to the network. Your boss has asked you to troubleshoot a recent OSPF synchronization problem that has arisen. There have been synchronization problems at separate locations in the OSPF area 0. There have been reported link failures during the rapid growth of the company network. You are required to resolve the OSPF problem. OSPF must be able to converge when the network changes.

The R2 router has lost connectivity to R1. The following is R1’s current route table:

Which expected route is missing from R1’s route table based on the topology during the maintenance period?

A.
O 10.142.0.0 [110/2] via 10.138.43.1, 00:00:09, FastEthernet0/0

B.
O IA 10.142.0.0 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0

C.
O IA 10.163.199.0 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0

D.
O IA 10.249.0.0 [110/2] via 10.138.43.1, 00:00:09, FastEthernet0/0

E.
O 10.163.199.0 [110/2] via 10.138.43.1, 00:00:09, FastEthernet0/0

F.
O 8.187.175.82 [110/3] via 10.138.43.1, 00:00:09, FastEthernet0/0

Explanation:
8.187.175.82 is the loopback interface of D2 which is needed to maintain the virtual link between D1 & D2. During the maintenance period, the virtual link will be removed and we cant see this loopback interface because the area 0 will be discontiguous.

Notice: Maybe some data in this question is not correct. Hope we will find enough information to update this page soon!