CompTIA Security Plus Mock Test Q203

A server is configured to communicate on both VLAN 1 and VLAN 12. VLAN 1 communication works fine, but VLAN 12 does not. Which of the following MUST happen before the server can communicate on VLAN 12?

A. The server’s network switch port must be enabled for 802.11x on VLAN 12.
B. The server’s network switch port must use VLAN Q-in-Q for VLAN 12.
C. The server’s network switch port must be 802.1q untagged for VLAN 12.
D. The server’s network switch port must be 802.1q tagged for VLAN 12.


Correct Answer: D
Section: Network Security

Explanation:
802.1q is a standard that defines a system of VLAN tagging for Ethernet frames. The purpose of a tagged port is to pass traffic for multiple VLAN’s.

Incorrect Options:
A: 802.11x provides an authentication mechanism to devices wishing to attach to a LAN or WLAN.
B: VLAN Q-in-Q allows multiple VLAN tags to be inserted into a single frame.
C: The purpose an untagged port is to accept traffic for a single VLAN only.

Reference:
https://en.wikipedia.org/wiki/IEEE_802.1Q
https://documentation.meraki.com/zGeneral_Administration/Tools_and_Troubleshooting/Fundamentals_of_802.1Q_VLAN_Tagging
https://en.wikipedia.org/wiki/IEEE_802.1X
https://en.wikipedia.org/wiki/IEEE_802.1ad