Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 109

An engineer needs dynamic routing between two routers and is unable to establish OSPF adjacency. The output of the show ip ospf neighbor command shows that the neighbor state is EXSTART/EXCHANGE.
Which action should be taken to resolve this issue?

Answer options

• A. match the passwords
• B. match the hello timers
• C. match the MTUs
• D. match the network types

Correct answer: C

Explanation

The correct answer is C because OSPF requires that the MTU sizes match between neighbors to successfully establish an adjacency. If the MTUs are different, OSPF cannot proceed past the EXSTART state. The other options, while important for OSPF operation, do not directly address the issue indicated by the EXSTART/EXCHANGE state.