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

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

Answers Explanation & Hints: 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.

How can VLAN hopping attacks be prevented?

To prevent the VLAN hopping from being exploited, we can do the below mitigations: Ensure that ports are not set to negotiate trunks automatically by disabling DTP: NEVER use VLAN 1 at all. Disable unused ports and put them in an unused VLAN ▪ Always use a dedicated VLAN ID for all trunk ports.

How would you mitigate against a double tagging or VLAN hopping attack?

To help prevent a VLAN hopping attack using double tagging, do not use the native VLAN to send user traffic. You can do this by creating a VLAN that does not have any ports added. This unused VLAN is only for the native VLAN assignment.

Which type of VLAN is used to designate which traffic is untagged when crossing a trunk port?

Which type of VLAN is used to designate which traffic is untagged when crossing a trunk port? Answers Explanation & Hints: A native VLAN is the VLAN that does not receive a VLAN tag in the IEEE 802.1Q frame header.

What mitigation method is effective against CAM table overflow attacks?

What mitigation method is effective against CAM table overflow attacks? Port security is the most effective method for preventing CAM table overflow attacks.

Which type of VLAN is used to?

Answers Explanation & Hints: A native VLAN is the VLAN that does not receive a VLAN tag in the IEEE 802.1Q frame header. Cisco best practices recommend the use of an unused VLAN (not a data VLAN, the default VLAN of VLAN 1, or the management VLAN) as the native VLAN whenever possible.

What’s the best way to hopping a VLAN?

There are two primary methods of VLAN hopping: switch spoofing and double tagging. In a switch spoofing attack, an attacking host that is capable of speaking the tagging and trunking protocols used in maintaining a VLAN imitates a trunking switch.

Is the trunk port vulnerable to VLAN hopping?

However, we see that the attacker belongs to the native VLAN of the trunk port. Which means this topology is vulnerable to a Double Tagging attack. An attacker can use the program Scapy, to create the specially crafted frames needed for processing this attack.

How does switch 2 handle VLAN hopping attacks?

It checks that the host is part of the stated VLAN and forwards the packet to all native VLAN ports (VLAN 1). Switch 2 then receives the packet with only one header left. It assumes the frame belongs to the stated VLAN on this tag (VLAN 2) and forwards to all ports configured for VLAN 2.

Can you change the VLAN1 on a Cisco switch?

You might have read many times during your studies that changing the native VLAN1 on Cisco switch trunk ports is highly recommended.