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How can you mitigate attacks in which the attacker attaches more than one VLAN tag to a packet?

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How can you mitigate attacks in which the attacker attaches more than one VLAN tag to a packet?
A. Disable EtherChannel
B. Enable transparent VTP on the switch
C. Explicitly identify each VLAN allowed across the trunk
D. Assign an access VLAN to every active port on the switch
Correct Answer: D

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