The Cisco Hierarchical Network model presented previously will not be abandoned in the remainder of this chapter. In fact, the legacy three-layer model must be mastered to understand the changes that led to the creation of the new and improved Cisco Enterprise Architecture model, which extends the three-layer Hierarchical Network model.
The Cisco Enterprise Architecture model leveraged the Hierarchical Network model, added new components, and made the network more modular. The key aspect regarding this model is modularity. This defines new models that have different functions in the network and facilitates the convenient building block approach when building . . .
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