Introducing Network Design Concepts

CHAPTER 1 Introducing Network Design ConceptsObjectivesUpon completion of this chapter, you should be able to answer the following questions: What are the benefits of a hierarchal networkdesign? What is the Design methodology used by Network designers? What are the Design considerations for the core,distribution, and access layers? What are the Design considerations for the Network enterprise edge? What are the Design considerations that must bemet to support remote workers? What are the Design considerations for supportingenterprise wireless and/or data center/server farms?Key TermsThis chapter uses the following key terms. You can find the definitions in the Enterprise Architecturespage 5deterministic Network page 5top-down approachpage 7content networkingpage 8storage networkingpage 8network backbonepage 9virtual private networks (VPN)page 9extranetpage 9multilayer switchespage 11load balancingpage 11 Enhanced Interior Gateway Routing Protocol(EIGRP)page 11 Open Shortest Path First (OSPF) Protocolpage 11 Spanning Tree Protocol (STP)page 11full-meshpage 11partial-meshpage 11hot-swappablepage 13uninterruptible power supply (UPS)page 13convergence timepage 14switch block page 17 Rapid Spanning Tree Protocol (RSTP)page 18access control lists (ACL)page 19dynamic ACLpage 20reflexive ACLpage 20time-based ACLpage 20 Intermediate System-to-Intermediate System (IS-IS)Protocolpage 21 Power-over-Ethernet (PoE)

To meet the four fundamental design goals, a network must be built on an architecture that allows for both flexibility and growth. Hierarchical Network Design In networking, a hierarchical design is used to group devices into multiple networks. The networks are organized in a layered approach. The hierarchical design model has three basic layers:

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