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CCNP Quick Reference Sheets Bundle: Exams 642-901, 642-812, 642-845, 642-825 by Jay Swan, Denise Donohue, Brent Stewart

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Chapter 1. The Evolving Network Model

The Hierarchical Design Model

Cisco used the three-level Hierarchical Design Model for years. This older model provided a high-level idea of how a reliable network might be conceived, but it was largely conceptual because it didn’t provide specific guidance. Figure 1-1 shows the Hierarchical Design Model.

Hierarchical Design Model

Figure 1-1. Hierarchical Design Model

Figure 1-2 is a simple drawing of how the three-layer model might have been built out. A distribution layer-3 switch is used for each building on campus, tying together the access switches on the floors. The core switches link the various buildings together.

Figure 1-2. Three-Layer ...

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