Scenario
Refer to the topology. Your company has decided to connect the main office with three other
remote branch offices using point-to-point serial links.
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the
main office and the routers located in the remote branch offices.

An OSPF neighbor adjacency is not formed between R3 in the main office and R5 in the
Branch2 office. What is causing the problem?

A.
There is an area ID mismatch.

B.
There is a PPP authentication issue; a password mismatch.

C.
There is an OSPF hello and dead interval mismatch.

D.
There is a missing network command in the OSPF process on R5.

Explanation:
The “show ip ospf interface command on R3 and R5 shows that the hello and dead intervals
do not match. They are 50 and 200 on R3 and 10 and 40 on R5.