Which two VLAN trunking encapsulation methods exist, and which is non-proprietary?

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Multiple Choice

Which two VLAN trunking encapsulation methods exist, and which is non-proprietary?

Explanation:
VLAN trunking encapsulation methods determine how VLAN tags ride on Ethernet frames across a trunk. The two methods in use are IEEE 802.1Q and ISL (Inter-Switch Link). IEEE 802.1Q is an open standard defined by the IEEE, so it is non-proprietary and widely supported by equipment from many vendors. ISL, on the other hand, is Cisco-proprietary, tied to that vendor’s implementations rather than an open standard. So the two methods are 802.1Q and ISL, and the non-proprietary one is IEEE 802.1Q.

VLAN trunking encapsulation methods determine how VLAN tags ride on Ethernet frames across a trunk. The two methods in use are IEEE 802.1Q and ISL (Inter-Switch Link). IEEE 802.1Q is an open standard defined by the IEEE, so it is non-proprietary and widely supported by equipment from many vendors. ISL, on the other hand, is Cisco-proprietary, tied to that vendor’s implementations rather than an open standard. So the two methods are 802.1Q and ISL, and the non-proprietary one is IEEE 802.1Q.

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