The Cisco three-layer hierarchical model doesn't describe how communications take place.
The Cisco three-layer hierarchical model is also referred to as a hierarchical internetworking model and it can be defined as a three-layer model that's used for the design of an enterprise (large) network based on the following layers:
In conclusion, the Cisco three-layer hierarchical model doesn't describe how communications take place, but it focuses on how best to design a an enterprise (large) network.
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