What are the two VLAN trunking methods for encapsulating frames?

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Multiple Choice

What are the two VLAN trunking methods for encapsulating frames?

Explanation:
VLAN trunking relies on tagging frames so a single physical link can carry traffic for multiple VLANs. The two methods used to encapsulate those frames are 802.1Q and ISL. 802.1Q is the industry-standard tagging method that inserts a 4-byte tag into the Ethernet frame, between the source MAC and the EtherType/length field. This tag carries the VLAN ID and allows switches along the path to identify which VLAN the frame belongs to; it's widely supported across devices and networks today. ISL is Cisco’s older, proprietary encapsulation that wraps the original frame with a new header and trailer to carry VLAN information. It’s largely phased out in favor of 802.1Q and adds more overhead, plus it isn’t as universally supported. Ethernet framing defined by 802.3 does not include VLAN tagging, so it isn’t a trunk encapsulation method.

VLAN trunking relies on tagging frames so a single physical link can carry traffic for multiple VLANs. The two methods used to encapsulate those frames are 802.1Q and ISL.

802.1Q is the industry-standard tagging method that inserts a 4-byte tag into the Ethernet frame, between the source MAC and the EtherType/length field. This tag carries the VLAN ID and allows switches along the path to identify which VLAN the frame belongs to; it's widely supported across devices and networks today. ISL is Cisco’s older, proprietary encapsulation that wraps the original frame with a new header and trailer to carry VLAN information. It’s largely phased out in favor of 802.1Q and adds more overhead, plus it isn’t as universally supported.

Ethernet framing defined by 802.3 does not include VLAN tagging, so it isn’t a trunk encapsulation method.

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