Discussion
Which of the following protocols are used to configure trunking on a switch?
1.VLAN Trunk Protocol
2.VLAN
3.802.1Q
4.ISL
Answer: C
Correct answer: 3 and 4
802.1Q and ISL are the trunking protocols: 802.1Q is the IEEE standard, inserting a four-byte tag into the frame, and ISL is the older Cisco proprietary method that encapsulates the whole frame. VTP is not a trunking protocol - it runs *over* a trunk to distribute VLAN information - and VLAN is not a protocol at all.
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