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?

A. Collapsed-core model
B. Three-tier model
C. DOD model
D. Access model

B. 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.