You need to configure a trunk interface to support the protocol of 802.1Q. Which command will achieve this?

A. Switch(config-if)# switchport mode trunk 802.1q
B. Switch(config-if)# switchport trunk encapsulation 802.1q
C. Switch(config-if)# switchport 802.1q
D. Switch(config-if)# switchport encapsulation trunk 802.1q

B. The command to specify 802.1Q encapsulation on a trunk interface is switchport trunk encapsulation 802.1q