1. Switch(config)# switchport trunk encapsulation isl
  2. Switch(config)# switchport trunk encapsulation ietf
  3. Switch(config)# switchport trunk encapsulation dot1q
  4. Switch(config-if)# switchport trunk encapsulation isl
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1 Answers

Answer: Option 5

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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