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

  • 1
    Switch (config) #switchport trunk encapsulation ietf
  • 2
    Switch (config) #switchport trunk encapsulation dot1q
  • 3
    Switch (config-if) #switchport trunk encapsulation ietf
  • 4
    Switch (config-if) #switchport trunk encapsulation dot1q
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Answer : 4. "Switch (config-if) #switchport trunk encapsulation dot1q"
Explanation :

Answer: D) 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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