Cisco Certified Network Associate (CCNA) Practice Exam

The command "show vlan" is used to display the VLAN configurations on a switch. This command provides detailed information about the VLANs configured in the switch, including the VLAN ID, name, status, and the ports that belong to each VLAN. This makes it a crucial command when assessing how a switch is segmenting network traffic and ensuring that the VLANs are correctly set up.

While the other commands serve their own purposes, they do not focus specifically on VLAN configurations. For example, "show ip interface brief" provides a summary of the interfaces and their statuses but does not delve into VLAN details. "Show vtp status" provides information regarding VLAN Trunking Protocol (VTP) but does not list VLANs directly. Lastly, "show interface INTERFACE NUMBER" focuses on a specific interface's details rather than VLAN configurations. Thus, the "show vlan" command stands out as the most relevant for verifying VLAN setups on a switch.