Which statement best describes a trunk port in a VLAN-enabled switch environment?

• A. Carries traffic for multiple VLANs using 802.1Q tagging
• B. Carries traffic for a single VLAN only
• C. Connects end-user devices to a switch
• D. Drops all tagged frames by default

Answer: (A)

A trunk port is used to carry traffic from multiple VLANs over a single physical link by tagging frames with the VLAN ID. This tagging, typically done with the 802.1Q standard, allows switches on either end to keep each VLAN’s traffic separate as it travels across the same cable. This is what enables inter-switch links and uplinks to carry multiple VLANs without needing a separate physical connection for each one. In contrast, an access port belongs to a single VLAN and sends untagged frames, which is why it’s used for end-user devices. It wouldn’t make sense for a trunk to drop tagged frames—the whole purpose of a trunk is to transport and preserve those tagged frames to maintain VLAN separation across the network.