Frequent question: What is a practice that protects a network from VLAN hopping attacks?

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.

Which two practices would you follow to prevent VLAN attacks on a network?

To prevent a Switched Spoofing attack, there are a few steps you should take:

  1. Do not configure any access points with either of the following modes: “dynamic desirable”, “dynamic auto”, or “trunk”.
  2. Manually configure access ports and disable DTP on all access ports.

What is one best practice for mitigating VLAN hopping?

One best practice for mitigating VLAN hopping is to shut down all unused ports.

Which method is used when an attacker attempts a VLAN hopping attack?

VLAN hopping can be accomplished in one of two ways: Switch SpoofingWith a switch spoofing method, an attacker imitates a trunking switch by using the VLAN’s tagging and trunking protocol (Multiple VLAN Registration Protocol, IEEE 802.1Q, or Dynamic Trunking Protocol).

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What is VLAN hopping in networking?

VLAN hopping (virtual local area network hopping) is a method of attacking a network by sending packets to a port that is not normally accessible from a given end system. … The target switch then sends the frame along to the victim port.

How do you do VLAN hopping?

There are two primary methods of VLAN hopping: switch spoofing and double tagging. Both attack vectors can be mitigated with proper switch port configuration.


  1. Simply do not put any hosts on VLAN 1 (The default VLAN). …
  2. Change the native VLAN on all trunk ports to an unused VLAN ID.

How can VLAN make your network more secured and efficient?

Because VLANs support a logical grouping of network devices, they reduce broadcast traffic and allow more control in implementing security policies. Also, surveillance traffic is only available to those authorized, and bandwidth is always available, when needed.

What is a recommended best practice when dealing with the native VLAN?

What is a recommended best practice when dealing with the native VLAN? Assign it to an unused VLAN.

What are the prevention techniques for Layer 2 attacks?

To prevent this type of attack, a feature known as DHCP Snooping should be enabled on all Layer 2 ports. This feature defines trusted ports, which can send DHCP requests and acknowledgements, and untrusted ports, which can forward only DHCP requests.

What action can a network engineer take to mitigate the VLAN hopping attacks?

What action can a network administrator take to help mitigate the threat of VLAN hopping attacks? Disable VTP. Enable PortFast on all switch ports. Configure all switch ports to be members of VLAN 1.

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

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.