Which command can you enter to view the ports that are assigned to VLAN 20?

The `show vlan id 20` command is the most direct and accurate way to display which physical switch ports are currently members of VLAN 20, along with other VLAN-specific details. This command directly queries the VLAN database for the specified VLAN.

`show ip interface brief` displays the IP address and status of all interfaces, including SVIs, but does not show which physical ports belong to which VLAN.

`show interface vlan 20` displays the status and statistics for the Switch Virtual Interface (SVI) for VLAN 20, not the physical ports assigned to it.

`show ip interface vlan 20` is incorrect syntax; the correct command for SVI IP info is `show ip interface brief` or `show interface vlan 20` if it has an IP.