This section discusses Cisco design recommendations for an enterprise campus network. These networks need to support evolving technologies such as IP telephony, storage-area networks, content networking, and application networking.
Constructing an enterprise campus network using modular building blocks can add to a network's availability, in addition to its scalability. Traditionally, Cisco prescribed a three-layer model for network designers. Those three layers, as shown in Figure 2-1, are as follows: