Cisco Certified Network Associate (CCNA) Practice Exam

What information is provided by the command #show ip ospf neighbor?

1. The routing table of OSPF

2. Neighbor IDs, state, and dead time

3. OSPF configurations including priority numbers

4. All OSPF areas and their routing protocols

The correct answer is: Neighbor IDs, state, and dead time

The command **#show ip ospf neighbor** provides a list of all OSPF (Open Shortest Path First) neighbors and vital information about their current state in the OSPF process. The correct choice highlights that this command displays Neighbor IDs, the state of each neighbor (such as DR, BDR, or DROther), and the dead timer. Understanding the specifics is crucial for network management and troubleshooting. The Neighbor ID is an identifier for each OSPF neighbor, allowing you to identify which neighboring router is which. The state indicates the current status of the OSPF adjacency, which can help diagnose connectivity issues or neighbor relationships. The dead timer is critical because it defines the time before a router considers a neighbor down if it does not receive OSPF hello packets; this timer is important for maintaining accurate routing information and ensuring network stability. While the information provided by this command focuses on adjacency and neighbor relationships, other options address different aspects of OSPF. The routing table of OSPF would be visible with a different command, such as **#show ip route**. OSPF configurations can be checked using commands that specifically target configuration settings, while details about OSPF areas and routing protocols will not be detailed