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.
The hello and dead interval mismatches are more common when OSPF operates over Non-Broadcast Multi-Access (NBMA) networks such as Frame Relay and ATM hub and spoke environments, where physical interfaces are used on one end and point-to-point sub-interfaces are used on the other end. This results in different OSPF network types on either ends, using different hello and dead interval timers when they are left with the default configurations.