On a trunk link carrying multiple VLANs, how are frames tagged?

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Multiple Choice

On a trunk link carrying multiple VLANs, how are frames tagged?

Explanation:
Frames on a trunk link carrying multiple VLANs are tagged with a VLAN ID using 802.1Q. This tagging inserts a 4-byte VLAN tag into the Ethernet frame so switches know which VLAN the frame belongs to as it travels across the single physical link. That tagging lets multiple VLANs share the same wire while keeping their traffic isolated, with the native VLAN sometimes sent untagged depending on configuration. The idea is that the tag is what carries the VLAN identity, enabling proper forwarding at each end. The other statements miss this essential point: trunk links do carry VLAN traffic, and 802.1Q tagging is about VLAN identification rather than security.

Frames on a trunk link carrying multiple VLANs are tagged with a VLAN ID using 802.1Q. This tagging inserts a 4-byte VLAN tag into the Ethernet frame so switches know which VLAN the frame belongs to as it travels across the single physical link. That tagging lets multiple VLANs share the same wire while keeping their traffic isolated, with the native VLAN sometimes sent untagged depending on configuration. The idea is that the tag is what carries the VLAN identity, enabling proper forwarding at each end. The other statements miss this essential point: trunk links do carry VLAN traffic, and 802.1Q tagging is about VLAN identification rather than security.

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