You have four campuses, each containing 500 PCs, and each edge switch will contain 20 to 30 PCs. Based on this layout, which design model should be used?

Based on the layout of your network, the three-tier model is the most appropriate model to design. Since there are four campuses, the core layer is recommended for connectivity between the campuses. The collapsed core model is best suited to a single campus. DoD model is a term used when referring to the layers of the OSI model in a macro model. Access model is not a term used with switching and routing design.