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In a Cisco switch that only supports 802.1q, what's the command to enable trunking?
Switch trunk encap 802.1q
Switchport mode trunk
Both A and B
Switchport trunk encapsulation dot1q
Modern Cisco switches do not support ISL; a legacy Cisco proprietary trunking protocol. Because of this you do not need to specify the encapsulation type with "encapsulation dot1q/isl" when configuring a trunk. Simply configuring "switchport mode trunk" will by default enable dot1q encapsulation.
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