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CHAPTER 1Hierarchical Network DesignObjectivesUpon completion of this chapter What are the structured engineering prin-ciples of Network Design ? How do you apply the three Hierarchical net-work layers in Network Design ? What are the four basic modules in an enter-prise campus Network architecture that inter-connect via the core? How do the modules of the Cisco Enterprise Architecture model differ? What are some trends that are challenging enterprise Network architectures? How do the Borderless Network , Collaboration Network , and Data Center/Virtualization Network architectures address the Network challenges?Key TermsThis chapter uses the following key terms. You can find the definitions in the Network page 3medium-size Network page 3large Network page 3access layer page 6distribution layer page 7core layer page 9three-tier Hierarchical Design page 10two-tier Hierarchical Design page 10collapsed core page 10modular Network Design page 11Cisco Enterprise Architecture model page 14enterprise campus module page 15enterprise edge module page 17SP edge module page 18enterprise branch module page 21enterprise teleworker module pag

Chapter 1: Hierarchical Network Design 3 Network Requirements (1.1.1.1) When discussing network design, it is useful to categorize networks based on the

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