Which command verifies an OSPF neighbor is formed and in Full adjacency?

• A. show ip ospf neighbor
• B. show ip route ospf
• C. debug ip ospf neighbor
• D. show ospf neighbors

Answer: (A)

To verify that an OSPF neighbor is formed and in Full adjacency, you check the OSPF neighbor table for the neighbor’s state. The standard command shows each neighbor’s ID, IP, interface, and especially the State column. When the state is Full, the adjacency is completed and router LSAs are being exchanged, meaning the two routers are fully synchronized and ready to route with OSPF.

Other commands don’t provide this direct, on-the-spot confirmation: show ip route ospf shows OSPF routes (not the neighbor status), debug ip ospf neighbor can flood real-time events and is meant for troubleshooting rather than quick verification, and show ospf neighbors isn’t the standard Cisco syntax for viewing neighbor state.