Refer to the exhibit. Router edge-1 is unable to establish OSPF neighbor adjacency with router ISP-1. Which two configuration changes can you make on edge-1 to allow the two routers to establish adjacency? (Choose two)

Question:
Refer to the exhibit. Router edge-1 is unable to establish OSPF neighbor adjacency with router ISP-1. Which two configuration changes can you make on edge-1 to allow the two routers to establish adjacency? (Choose two)

• Set the subnet mask on edge-1 to 255 255.255.252.
• Reduce the MTU on edge-1 to 1514.
• Set the OSPF cost on edge-1 to 1522.
• Reduce the MTU on edge-1 to 1500.
• Configure the ip ospf mtu-ignore command on the edge-1 Gi0/0 interface.

Explanation: In order to become OSPF neighbor following values must be match on both routers:+ Area ID
+ Authentication
+ Hello and Dead Intervals
+ Stub Flag
+ MTU SizeTherefore we need to adjust the MTU size on one of the router so that they are the same. Or we can tell OSPF to ignore the MTU size check with the command “ip ospf mtu-ignore”.

Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps