A broad range of places, such as campuses, office spaces, and shopping malls, are covered by networks. You can access internal resources of your school, access internal printers of your company to print documents, or access the Internet to browse news through the networks. These networks belong to campus networks and are generally constructed by enterprises or organizations. Campus networks not only improve the operational efficiency of enterprises, but also provide network access services for external users.This chapter describes the basic architecture of a campus network and details how to build a campus network.