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46240  \nThis page intentionally left blank  \nChapter 5  \nDesigning a Network Topology  \nIn this chapter, you will learn techniques for developing a network topology. A topology is a map of an internetwork that indicates network segments, interconnection points, and user communities. Although geographical sites can appear on the map, the purpose of the map is to show the geometry of the network, not the physical geography or technical implementation. The map is a high-level blueprint of the network, analogous to an architectural drawing that shows the location and size of rooms for a building, but not the construction materials for fabricating the rooms.  \nDesigning a network topology is the first step in the logical design phase of the topdown network design methodology. To meet a customer’s goals for scalability and adaptability, it is important to architect a logical topology before selecting physical products or technologies. During the topology design phase, you identify networks and interconnection points, the size and scope of networks, and the types of internetworking devices that will be required, but not the actual devices.  \nThis chapter provides tips for both campus and enterprise WAN network design and focuses on hierarchical network design, which is a technique for designing scalable campus and WAN networks using a layered, modular model. In addition to covering hierarchical network design, the chapter also covers redundant network design topologies and topologies that meet security goals. (Security is covered in more detail in Chapter 8,“Developing Network Security Strategies.”) This chapter also discusses the Cisco SAFE security reference architecture.  \nUpon completion of this chapter, you will know more about designing secure, redundant, hierarchical, and modularized topologies. A topology diagram is a useful tool to help you and your customer begin the process of moving from a logical design to a physical implementation of the customer’s network environment.  \n120 Top-Down Network Design  \nHierarchical Network Design  \nTo meet a customer’s business and technical goals for a corporate network design, you might need to recommend a network topology consisting of many interrelated components. This task is made easier if you can “divide and conquer” the job and develop the design in layers.  \nNetwork design experts have developed the hierarchical network design model to help you develop a topology in discrete layers. Each layer can be focused on specific functions, allowing you to choose the right systems and features for the layer. For example, in Figure 5-1, high-speed WAN routers can carry traffic across the enterprise WAN backbone, medium-speed routers can connect buildings at each campus, and switches can connect user devices and servers within buildings.  \nBuilding C-1 Building C-2  \nFigure 5-1 Hierarchical Topology A typical hierarchical topology is  \n■ A core layer of high-end routers and switches that are optimized for availability and performance.  \n■ A distribution layer of routers and switches that implement policies. In small and medium-sized organizations, the core and distribution layers can be combined.  \n■ An access layer that connects users via lower-end switches and wireless access points.  \nChapter 5: Designing a Network Topology 121  \nWhy Use a Hierarchical Network Design Model?  \nNetworks that grow unheeded without any plan in place tend to develop in an unstructured format. Dr. Peter Welcher, the author of network design and technology articles for Cisco World and other publications, refers to unplanned networks as fur-ball networks.  \nWelcher explains the disadvantages of a fur-ball topology by pointing out the problems  \nthat too many CPU adjacencies cause. When network devices communicate with many other devices, the workload required of the CPUs on the devices can be burd","cbCaikX9QagFekNu","https://ap.wps.com/l/cbCaikX9QagFekNu","pdf",170184,"English","# Chapter 5: Designing a Network Topology\n## Hierarchical Network Design\n## Why Use a Hierarchical Network Design Model?","[{\"question\":\"What does network topology describe in this chapter?\",\"answer\":\"Network topology is a high-level map of an internetwork showing network segments, interconnection points, and user communities, focusing on geometry rather than physical geography or implementation.\"},{\"question\":\"What are the main layers in a typical hierarchical topology?\",\"answer\":\"A typical hierarchical topology includes a core layer optimized for availability and performance, a distribution layer implementing policies, and an access layer connecting users through lower-end switches and wireless access points.\"},{\"question\":\"Why use a hierarchical network design model instead of a nonhierarchical approach?\",\"answer\":\"Hierarchical design reduces CPU workload and broadcast-related burdens in fur-ball or flat networks, enables modular topologies that limit communicating routers, supports cost and capacity planning, and improves testing, fault isolation, and change management.\"}]","Top-Down Network Design - Third Edition - Chapter 5 - Designing a Network Topology | PDF",1792967273]