Which command would allow you to see all interfaces that are configured in trunk mode and the VLANs that are allowed on those trunk ports?
- show vlan detail
- show vlan interfaces
- show vlan brief
- show interfaces trunk
Explanation: To verify the configuration and status of trunk ports on a switch, the sources specify that you should use the show interfaces trunk command. This command is essential because it provides a detailed summary of all interfaces currently operating in trunking mode, including their administrative and operational status, encapsulation type (such as 802.1q), and the native VLAN assigned to the port.
Most importantly, the output of show interfaces trunk explicitly lists the VLANs allowed on trunk, as well as the VLANs that are currently active and not pruned by the Spanning Tree Protocol. While other commands like show vlan brief are useful for seeing which access ports are assigned to specific VLANs, they do not provide the detailed trunking parameters and allowed-list information that show interfaces trunk offers. Another useful command for individual port verification is show interfaces [interface-id] switchport, which shows whether a port is operationally a trunk and its allowed VLANs, but show interfaces trunk provides a more efficient global view of all trunking links.
Related exam: Modules 1 – 7: Checkpoint Exam: Network Switching Answers (CCNP ENCOR v9)
