VLANs break up broadcast domains

VLANs break up broadcast domains in a switched internetwork.
Chapter 14, “VLANs, Trunks, and VTP,” includes detailed information about VLANs and
how to configure them in an internetwork. It is imperative that you understand VLANs, because
the traditional way of building the campus network is being redesigned and VLANs are a large
factor in building the new campus model.