Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 438

Which of the following statements are true regarding two OSPF routers to become neighbors? (Choose two.)

Answer options

• A. Must use the same ASN
• B. Must have identical hello and dead timers
• C. Must have matching MTU’s on the physical network links that connect the routers.
• D. Need not be on the same subnet.

Correct answer: B, C

Explanation

For OSPF routers to form a neighbor relationship, they must have identical hello and dead timers (B) to ensure they can communicate effectively. Additionally, matching MTUs (C) are necessary for packet size consistency, while having the same ASN (A) is not required, and being on the same subnet (D) is not mandatory for OSPF neighbors.