Which feature on a switch makes it vulnerable to VLAN hopping attacks?

Question:
Which feature on a switch makes it vulnerable to VLAN hopping attacks?

• the mixed duplex mode enabled for all ports by default
• the limited size of content-addressable memory space
• mixed port bandwidth support enabled for all ports by default
• the automatic trunking port feature enabled for all ports by default

Explanation: A VLAN hopping attack enables traffic from one VLAN to be seen by another VLAN without routing. In a basic VLAN hopping attack, the attacker takes advantage of the automatic trunking port feature enabled by default on most switch ports.

Exam with this question: Modules 10 – 13: L2 Security and WLANs Exam Answers