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  3. Which of the following are VLAN frame encapsulation types that may be configured on a Catalyst switch? (Choose two.) A. VTP B. I

Which of the following are VLAN frame encapsulation types that may be configured on a Catalyst switch? (Choose two.) A. VTP B. I

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问题 Which of the following are VLAN frame encapsulation types that may be configured on a Catalyst switch? (Choose two.)
A. VTP
B. ISL
C. CDP
D. 802.1Q
E. 802.1p
F. LLC
选项
答案B,D
解析 Explanation:
The two VLAN trunking encapsulation types are:
Inter-Switch Link (ISL): This is proprietary to Cisco switches, and it’s used for Fast Ethernet and Gigabit Ethernet links only. ISL routing can be used on a switch port, router interfaces, and server interface cards to trunk a server. ISL lets you explicitly tag VLAN information onto an Ethernet frame. This tagging information allows VLANs to be multiplexed over a trunk link through an external encapsulation method, which allows the switch to identify the VLAN membership of a frame over the trunked link.

IEEE 802.1Q: Created by the IEEE as a standard method of frame tagging, this actually inserts a field into the frame to identify the VLAN. If you’re trunking between a Cisco switched link and a different brand of switch, you have to use 802.1Q for the trunk to work.
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