Chapter 4. Are VLANS Safe?

Perform a Google search on “VLAN hopping,” and you are presented with about 12,000 hits. This clearly indicates that VLAN security has been, and continues to be, at the center of many discussions and debates in LAN security circles. With the amount of information publicly available on the subject coming in variable quality, it can be difficult to separate truth from myth. This chapter settles the debate by providing concrete technical details about the protocols involved and their related attacks, as well as countermeasures.

IEEE 802.1Q Overview

What is a VLAN? The answer is simple: It is a broadcast domain. In other words, a VLAN defines how far a broadcast packet can radiate. Assuming no routing is involved, traffic ...

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