Home » Cisco » 210-260 v.2 » What happens if an attacker attempts a double-tagging attack?
If you change the native VLAN on the trunk port to an unused VLAN, what happens if an attacker attempts a double-tagging attack?
A. The trunk port would go into an error-disabled state.
B. A VLAN hopping attack would be successful.
C. A VLAN hopping attack would be prevented.
D. The attacked VLAN will be pruned.
Correct Answer: C
Explanation/Reference:
The key feature of a double tagging attack is exploiting the native VLAN. Since VLAN 1 is the default VLAN for access ports and the default native VLAN on trunks, it’s an easy target. The first countermeasure is to remove access ports from the default VLAN 1 since the attacker’s port must match that of the switch’s native VLAN. Reference: https://www.nlogic.co/understanding-vlan-hopping-attacks/