By Tom Sheldon, Thomas Sheldon
This encyclopaedia seeks to aid readers comprehend networks and international communications platforms through supplying succinct executive-style briefings of vital networking applied sciences, in addition to easily-digestible diagrams that illustrate key themes, topologies, architectures and configurations. The accompanying CD-ROM incorporates a totally searchable model of the e-book, extra wide assurance of issues, and links to proper websites.
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Extra info for McGraw Hill's Encyclopedia of Networking and Telecommunications with CDROM
5. What is a broadcast domain, and where does it exist in a switched LAN? 6. What is a VLAN, and why is it used? 7. At what OSI layers do devices in the distribution layer usually operate? 8. What is network segmentation? When is it necessary, and how is it done in a campus network design? 9. Is it possible to use Layer 2 switches in the distribution layer rather than Layer 3 switches? If so, what are the limitations? Part I: Overview and Design of a Campus Network Part I: Overview and Design of a Campus Network 39 Chapter 2.
These terms and the hierarchical network design are discussed in the next section. Hierarchical Network Design You can structure the campus network so that each of the three types of traffic flows or services outlined in Table 1-3 is best supported. Cisco has refined a hierarchical approach to network design that enables network designers to logically create a network by defining and using layers of devices. The resulting network is efficient, intelligent, scalable, and easily managed. The hierarchical model breaks a campus network into three distinct layers, as illustrated in Figure 1-5.
The idea behind the 80/20 rule is to keep traffic off the backbone. Instead, the administrator can implement the following solutions: • Reassign existing resources to bring the users and servers closer together • Move applications and files to a different server to stay within a workgroup • Move users logically (assigned to new VLANs) or physically to stay near their workgroups • Add more servers, which can bring resources closer to the respective workgroups Needless to say, conforming modern campus networks to the 80/20 rule has become difficult for the network Part I: Overview and Design of a Campus Network 33 34 Part I: Overview and Design of a Campus Network administrator.