For many years, Cisco recommended a three-layer hierarchical network design model, which included the Access Layer, the Distribution Layer, and the Core Layer. However, to provide for enhanced scalability and flexibility, Cisco later introduced the Cisco enterprise architecture model, which categorizes enterprise networks into six modules. The three layers of the Cisco Service Oriented Network Architecture (SONA) can be found in each of these modules. Specifically, each module can contain its own network infrastructure, services, and applications. This section summarizes the design considerations surrounding the modules that comprise the Cisco enterprise architecture model.
Traditionally, Cisco prescribed a three-layer . . .
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