Implementing Cisco IP Routing (CCNP ROUTE, legacy) — Question 96

Using new backup router in spite of faulty one in ospf domain but relationship with neighbor in one interface only not working, what is the reason of this problem?
(Choose two)

Answer options

• A. area Id match
• B. authentication mismatch
• C. process id of ospf not match
• D. ospf timers not match
• E. MTU mismatch

Correct answer: D, E

Explanation

The correct answers are D and E because OSPF requires that timers and MTU sizes match between routers to establish neighbor relationships. If these settings are not consistent, OSPF cannot form an adjacency, which explains the issue with only one interface not working. Options A, B, and C do not directly affect the relationship on a single interface under these conditions.