Cisco Certified Network Associate (CCNA) Practice Exam

When checking VLAN assignments, which command provides a summary of VLANs and their corresponding interfaces?

1. #show vlan brief

2. #show mac-address-table

3. #show vlan id

4. #show vlan assignments

The correct answer is: #show vlan brief

The command that provides a summary of VLANs and their corresponding interfaces is indeed the one that displays a concise overview of all VLANs configured on a switch along with the ports assigned to each VLAN. This command lists each VLAN by its ID, name, and the ports or interfaces that belong to it. It's particularly useful for network administrators to quickly assess VLAN configurations and make sure the ports are properly assigned to the correct VLANs. This functionality allows for efficient troubleshooting and verification of VLAN setup within the network, making it crucial for maintaining an organized network architecture. The output typically includes a brief view that helps in quickly identifying which interfaces belong to which VLAN, thus facilitating better network management. In contrast, other options focus on different aspects of VLAN or network configuration. For instance, viewing the MAC address table provides information about the device connections and the MAC addresses that each port has learned but does not directly indicate VLAN assignments. Similarly, while checking a specific VLAN by its ID or looking for VLAN assignments could provide some related information, these do not give a comprehensive summary of all VLANs and their assigned interfaces in a single output.