Which command displays all trunk ports on a Cisco switch?

The command that displays all trunk ports on a Cisco switch is the command that specifically focuses on trunking information—showing which ports are configured as trunk ports and their operational status. This command provides a clear view of the interface configuration relevant to trunking protocols like IEEE 802.1Q, which is essential for managing VLANs across multiple switches.

Using this command, network administrators can quickly identify trunk ports, check their status, and verify the encapsulation type being used. This information is crucial for troubleshooting connectivity issues between switches and ensuring that VLAN traffic is properly tagged and transmitted across trunk links.

The other commands listed do not provide the same level of specific detail about trunk ports. For instance, a command that reports on port status or interfaces generally may not filter out or clearly indicate which of those interfaces are trunk links. Therefore, when seeking information related directly to trunking, this command is the most appropriate choice.