On a trunk, what is applied to frames as they pass between devices?

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Multiple Choice

On a trunk, what is applied to frames as they pass between devices?

Explanation:
On a trunk link, frames need to carry information that identifies which VLAN they belong to so multiple VLANs can share the same physical cable. The mechanism used is VLAN tagging. An 802.1Q tag is inserted into each Ethernet frame as it traverses the trunk, carrying the VLAN ID (and some priority data). This tag lets the receiving switch place the frame into the correct VLAN and, if needed, remove the tag when sending the frame out on an access port. Without this tag, all traffic would mix into a single stream, defeating VLAN separation. The other options don’t provide the VLAN separation used on trunks. An IP header is part of the layer 3 payload and isn’t added to distinguish VLANs at the link layer. A MAC address filter isn’t how trunks segregate traffic across VLANs. The frame’s checksum (the FCS) is for error detection and isn’t used to identify VLANs on a trunk. The VLAN tag is the mechanism that enables multiple, isolated networks to share the same physical link.

On a trunk link, frames need to carry information that identifies which VLAN they belong to so multiple VLANs can share the same physical cable. The mechanism used is VLAN tagging. An 802.1Q tag is inserted into each Ethernet frame as it traverses the trunk, carrying the VLAN ID (and some priority data). This tag lets the receiving switch place the frame into the correct VLAN and, if needed, remove the tag when sending the frame out on an access port. Without this tag, all traffic would mix into a single stream, defeating VLAN separation.

The other options don’t provide the VLAN separation used on trunks. An IP header is part of the layer 3 payload and isn’t added to distinguish VLANs at the link layer. A MAC address filter isn’t how trunks segregate traffic across VLANs. The frame’s checksum (the FCS) is for error detection and isn’t used to identify VLANs on a trunk. The VLAN tag is the mechanism that enables multiple, isolated networks to share the same physical link.

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