Virtual LANs

Virtual LANs
With this new 20/80 rule, more and more users need to cross broadcast domains (VLANs), and
this puts the burden on routing, or layer 3 switching. By using VLANs within the new campus
model, you can control traffic patterns and control user access easier than in the traditional
campus network. Virtual LANs break up broadcast domains by using either a router or a switch
that can perform layer 3 functions. Figure 12.3 shows how VLANs are created and might look
in an internetwork.