Cisco Certified Network Associate (CCNA) Practice Exam

Which command would show detailed information about VLAN spanning tree status?

1. show spanning-tree vlan VLAN NUMBER

2. show vlan brief

3. show ip interface brief

4. show vtp status

The correct answer is: show spanning-tree vlan VLAN NUMBER

The command that provides detailed information about VLAN spanning tree status is the command that specifies the VLAN number. By using this command, you can view the spanning tree statistics for that specific VLAN, including the root bridge for the VLAN, the bridge priority, port roles and states, and whether there are any blocked ports due to STP (Spanning Tree Protocol) operations. This level of detail is essential for network administrators who need to troubleshoot and optimize the VLAN traffic flow and network stability. The other options do not provide the same focused level of detail for VLAN spanning tree information. For instance, the command that displays a brief summary of VLANs does not delve into the intricacies of spanning tree protocols. Similarly, the command that shows a summary of IP interface statuses offers insights into interface configurations and does not touch upon VLAN or STP. Lastly, the command that checks VTP (VLAN Trunking Protocol) status pertains to VLAN management rather than the specific functioning and status of spanning trees. Thus, the command detailing spanning tree status is the most appropriate for obtaining the necessary information.