This section expands on the Cisco Service-Oriented Network Architecture (SONA) framework described in Chapter 2 and explores the six modules of the Cisco Enterprise Architecture, with an emphasis on the network infrastructure design considerations.
NOTE The access, distribution, and core layers can appear within each module of the Cisco Enterprise Architecture.
The modularity built into the architecture allows flexibility in network design and facilitates implementation and troubleshooting. Before the details of the architecture itself are introduced, an overview of the evolution of enterprise networks is provided.
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