Which command would you use to verify OSPF neighbor adjacency on an interface?

• A. show ip ospf interface
• B. show ip protocols
• C. show ip route
• D. show interfaces

Answer: (A)

Verifying OSPF neighbor adjacency on a specific interface requires seeing how OSPF is operating on that interface. The per-interface OSPF command shows exactly which neighbors are discovered on each interface, along with their adjacency state (for example, Full status means a complete adjacency on that link). It also lists neighbor IDs, network type, area, and hello/dead timers, all of which help diagnose why adjacency may or may not be forming.

The other commands provide different information: one shows overall OSPF process details but not per-interface neighbor status; another shows routing table contents; and another shows general interface status without detailing OSPF neighbor relationships. So the per-interface command is the right tool to confirm whether neighbors have formed adjacencies on that interface.