Cisco Certified Network Associate (CCNA) Practice Exam

Which command lists OSPF-specific commands for troubleshooting?

1. #show ip protocols

2. #show ip ospf

3. #debug ip ospf hello

4. #show ip route

The correct answer is: #show ip protocols

The command that specifically lists OSPF-related commands for troubleshooting is the one that starts with "show ip ospf." This command provides detailed information about the OSPF process running on the router, including parameters, neighbor relationships, and OSPF database information. This is crucial for troubleshooting OSPF because it displays the current OSPF configuration and operational status, helping to identify potential issues in OSPF configurations or operations. Using "show ip protocols" reveals information about the routing protocols currently configured on the router, including OSPF. However, it does not specifically focus on OSPF details alone, making it less targeted for troubleshooting OSPF issues compared to the "show ip ospf" command. The "debug ip ospf hello" command is useful for real-time troubleshooting of OSPF messages but is not specifically for listing existing commands or their status. It is primarily used for examining OSPF Hello packets and neighbor discovery, which may be more intensive and less clear when trying to retrieve a list of commands or configurations. Meanwhile, "show ip route" provides the routing table on the router, showing all routes, including those learned via OSPF. Though it may give insight into OSPF-created routes,