Which statement about VLAN management traffic is true?

• A. Telnet, SNMP, and Syslog are carried on the management VLAN
• B. DHCP relay is carried on the management VLAN
• C. Video streams are carried on the management VLAN
• D. User authentication is carried on the management VLAN

Answer: (D)

Focusing on the management plane helps here: a dedicated management VLAN is kept separate from user data so administrators can securely access and manage devices. When an administrator logs into a network device, the credentials are validated through AAA services (like RADIUS or TACACS+). That authentication traffic travels from the device to the authentication server over the management network, so the act of user authentication is carried on the management VLAN. This separation protects sensitive control traffic and ensures management operations aren’t mixed with regular user traffic.

The other statements describe common management-related activities, but they’re not universally defining features of the management VLAN. Telnet, SNMP, and Syslog are typical management protocols, yet they can be configured to traverse different paths; DHCP relay serves end-user devices to obtain IP addresses and isn’t inherently part of management traffic; video streams are regular data streams, not management plane traffic.