Which switch port carries traffic for multiple VLANs simultaneously using 802.1Q tags?

Which switch port carries traffic for multiple VLANs simultaneously using 802.1Q tags?

• A. Access Port
• B. Edge Port
• C. Uplink Port
• D. Trunk Port

Answer: (D)

VLAN tagging with 802.1Q lets one physical link carry traffic for many VLANs by tagging each frame with its VLAN ID. A trunk port is specifically designed for this, because it can multiplex multiple VLANs over a single link. Access ports, on the other hand, carry traffic for only a single VLAN and send untagged frames, so they don’t support multiple VLANs on one link. Edge ports describe devices at the network edge (usually end-user devices) and aren’t defined by VLAN multiplexing. Uplink ports refer to connections to other switches or devices but aren’t themselves the mechanism for carrying multiple VLANs; that behavior depends on whether the link is configured as a trunk. Thus, the port that carries traffic for multiple VLANs simultaneously using 802.1Q tags is a trunk port. On trunks, most VLANs travel tagged, while the native VLAN can be sent untagged if configured.

VLAN tagging with 802.1Q lets one physical link carry traffic for many VLANs by tagging each frame with its VLAN ID. A trunk port is specifically designed for this, because it can multiplex multiple VLANs over a single link. Access ports, on the other hand, carry traffic for only a single VLAN and send untagged frames, so they don’t support multiple VLANs on one link. Edge ports describe devices at the network edge (usually end-user devices) and aren’t defined by VLAN multiplexing. Uplink ports refer to connections to other switches or devices but aren’t themselves the mechanism for carrying multiple VLANs; that behavior depends on whether the link is configured as a trunk. Thus, the port that carries traffic for multiple VLANs simultaneously using 802.1Q tags is a trunk port. On trunks, most VLANs travel tagged, while the native VLAN can be sent untagged if configured.