High Quality Content by WIKIPEDIA articles! VLAN hopping (virtual local area network hopping) is a computer security exploit, a method of attacking networked resources on a VLAN. The basic concept behind all VLAN hopping attacks is for an attacking host on a VLAN to gain access to traffic on other VLANs that would normally not be accessible. 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. Traffic for multiple VLANs is then accessible to the attacking host.

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