Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?

Switch(config)# switchport trunk encapsulation isl
Switch(config)# switchport trunk encapsulation ietf
Switch(config)# switchport trunk encapsulation dot1q
Switch(config-if)# switchport trunk encapsulation isl
Switch(config-if)# switchport trunk encapsulation dot1q

Correct Answer: Switch(config-if)# switchport trunk encapsulation dot1q

Explanation:

If you are on a 2950 switch, then the interface command is just switchport mode trunk, since the 2950 can only run the IEEE 802.1Q version. However, a 3550 can run both ISL and 802.1Q, so you must use the encapsulation command. The argument to choose 802.1Q for a trunking protocol is dot1q.

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