The Open Systems Interconnection (OSI) model, described in Appendix B, is an example of a modular framework for the communication protocols used between computers.

The following sections introduce two models that can be used for network design: the hierarchical model and the Cisco Enterprise Composite Network Model. You will see that both of these models involve creating modules, and that hierarchical design can in fact be part of the modules of the Enterprise Composite Network Model.

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