Cisco Certified Network Associate (CCNA) Practice Exam

Which command can be used to debug OSPF Hello packets?

1. #debug ip ospf packet

2. #show ip ospf interface

3. #debug ip ospf hello

4. #show ip ospf

The correct answer is: #debug ip ospf hello

The command that can be used to debug OSPF Hello packets is indeed the one that specifically targets the Hello packets used within the OSPF protocol. This command enables real-time monitoring of OSPF Hello packets, which are essential for establishing and maintaining neighbor relationships between routers within an OSPF network. Using this command allows network engineers to observe the details of the Hello packets being sent and received, including the interval between Hello packets and the settings that affect OSPF neighbor discovery. This is especially useful for troubleshooting issues related to OSPF adjacencies or neighbor formation. The other options, while related to OSPF, do not effectively allow for the same level of granularity in debugging Hello packets. For instance, the command that lists OSPF interfaces provides configuration and status information about OSPF-enabled interfaces but does not offer packet-level debugging. The command designed for general OSPF debugging will cover all OSPF packets, not just the Hello packets, which may produce more output than is relevant for a specific issue related to neighbor formation. By focusing on the OSPF Hello packets, network professionals can streamline their troubleshooting efforts, making this command particularly valuable in diagnosing connectivity issues in OSPF deployments.