CCNA LANs 11-4: VLAN Hopping

🔒 Understanding VLAN Hopping: Learn about VLAN hopping, a technique used by attackers to bypass VLAN security measures and gain unauthorized access to other network segments.

🔄 Methods of Attack: Explore two common methods used in VLAN hopping: switch spoofing and VLAN double tagging, which exploit vulnerabilities in VLAN configurations to hop between network segments.

🔧 Mitigation Strategies: Discover effective ways to mitigate VLAN hopping attacks, including disabling Dynamic Trunking Protocol (DTP), avoiding default native VLANs, and configuring ports strictly as access or trunk ports.

🔐 Enhancing Network Security: Implement these mitigation strategies to strengthen your network's defenses against VLAN hopping attacks, ensuring the integrity and security of your VLAN infrastructure.

Get ready to fortify your network and keep it safe from cyber threats! 💪🔒 #NetworkSecurity #VLANHopping

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[wourodahmed]

You are awesome. Thank you for this informative explanation

[robindeepsingh]

Very good explanation.
I noticed the double tagging attack was successful, only because the attacker was connected to a port which was a part of native vlan. If the attacker was connected to a port which was not the part of native vlan, lets say, was a part of vlan80, how would have double tagged frame (first tag vlan 80, second tag vlan 10)travelled in this same network?

[NoName-xlf]

If it would be the attack by leveraging DTP protocol, this means that the attacker can both send and receive frames from any multi-switch VLAN, is this right?

[James_Knott]

How often does double tagging work? A while ago, I tried to send a VLAN frame through a switch that already had VLANs enabled and it didn't go through. The only place I've seen double tagging is with telecom equipment designed to connect a customer to a fibre. The carrier would use the outer tag to isolate customers on the fibre, leaving the inner tag for the customer to use.

Your precautions, I would call normal configuration, that is make access ports access ports only and enable VLANs only where needed, such as VoIP phones that also connect a computer or WiFi access points that have multiple SSIDs.