Question:
How to create a trunk port and allow VLAN 20? (Choose Three.)
- switchport trunk encapsulation dot1q
- switchport mode trunk
- switchport trunk allowed vlan 20
- switchport trunk native vlan 20
- switchport mode dynamic desirable
Explanation: In switches that support both InterSwitch Link (ISL) and 802.1Q trunking encapsulations, we need to specify an trunking protocol so we must use the command “switchport trunk encapsulation dot1q” command first to set the trunk mode to 802.1Q. Then we configure trunking interface with the “switchport mode trunk” command. Then we explicitly allow vlan 20 with the command “switchport trunk allowed vlan 20” command. By default all VLANs are allowed to pass but after entering this command, only VLAN 20 is allowed.
Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps
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