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.
Examine the following excerpt from the show ip ospf command on D1:
Area BACKBONE (0)
Number of interfaces in the this area is 1
Area has no authentication
SPF algorithm last executed 00:00:31.280 ago
SPF algorithm executed 5 times
Area ranges are
Number of LSA 13. Checksum Sum 0x16F0FD
Number of opaque link LSA 0. Checksum Sum 0000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 16
Number of interfaces in this area is 2
Area has message digest authentication
SPF algorithm last executed 00:00:34.928 ago
SPF algorithm executed 7 times
Area ranges are
Number of LSA 5. Checksum Sum 0x02FCD3
Number of opaque link LSA 0. Checksum Sum 0000000
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Based on the information shown above, what is most likely causing the different missing routes throughout the network?
A.
Area 16 is configured with authentication.
B.
Area 16 has been configured to use the same interfaces as Area 0.
C.
Area 0 and Area 32 have been configured with mismatched LSA numbers.
D.
Area 16 has been configured as a total stub network
E.
Area 16 has been configured as a stub network
F.
Area 0 is discontiguous.
G.
None of the above
Explanation:
From the topology, we see D1 has 2 interfaces belong to Area 0, that are interfaces Fa0/1 & Fa0/2 but the output says there is only one interface in Area 0 (Number of interfaces in the this area is 1). Therefore we can deduce that a link in area 0 was down and area 0 is discontiguous.