In order to identify the transmissions that belong to each VLAN, a switch will add a tag to Ethernet frames that identifies the port through which they arrive at the switch.

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Quizplus · Accepted Answer

This is the basic function of VLAN tagging, where the switch adds a VLAN tag to the Ethernet frame header to identify which VLAN the frame belongs to. The tag includes information about the VLAN ID, and optionally the priority, type, and other metadata. This allows the switch to forward the frame to the appropriate VLAN and apply any configured quality of service (QoS) settings.

In Order to Identify the Transmissions That Belong to Each