VLAN and Trunking Fundamentals

You must understand the basics of how VLANs and trunking operate before you can learn to secure those features. This section reviews how VLANs and trunking are configured and how they operate.

Figure 9-1 serves as a reference for the discussion going forward. You might want to bookmark this page or take a moment to make a simple drawing of the topology. You will want to refer to this illustration often during the discussion.

Figure 9-1 Base Topology for Most of the Discussion in This Chapter