Cisco Certified Network Associate (CCNA) 2026 – 400 Free Practice Questions to Pass the Exam

The command used to display OSPF interfaces is "#show ip ospf interface." This command provides a detailed view of the OSPF-enabled interfaces on a router, including various statistics such as the interface state (whether it is up or down), designated router (DR) and backup designated router (BDR) information, and the timers associated with OSPF on each interface.

Using this command is essential for network administrators to troubleshoot OSPF operation, verify the configuration, and ensure that OSPF is functioning properly on specific interfaces. It can help identify any issues with OSPF neighbors or confirm that the correct interfaces are participating in the OSPF routing process.

The other options serve different purposes. The command that displays OSPF-related protocol information gives an overview of OSPF settings but does not focus specifically on the interfaces. The debugging command is used to monitor OSPF neighbor adjacency changes, which is more about real-time diagnosis rather than an ongoing view of interfaces. The mention of "river" in the last choice seems to be a typographical error and does not correspond to any valid Cisco command.