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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 ietf
Switch (config) #switchport trunk encapsulation dot1q
Switch (config-if) #switchport trunk encapsulation ietf
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 swichport mode trunk since the 2050 can only run the IEEE 802.1q version. However, a 3550 can run both ISL and 802.1q, so you must also use the encapsulation command. The argument to choose 802.1q for a trunking protocol is dot1q.

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