Discussion
What protocols are used to configure trunking on a switch?
1.VLAN Trunking Protocol
2.VLAN
3.802.1Q
4.ISL
Answer: A
Correct answer: 3 and 4
Trunking is configured with an encapsulation, and there are two: 802.1Q, the IEEE standard, which inserts a four-byte tag into the frame and leaves the native VLAN untagged; and ISL, the older Cisco-proprietary method, which encapsulates the whole frame. VTP is not a trunking protocol - it distributes the VLAN database across a domain and requires trunks to already exist - and "VLAN" is not a protocol at all.
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