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ch02_CE - Guide to Networking Essentials Fifth Edition...

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Guide to Networking Essentials, Fifth Edition 2-1 Chapter 2 Network Design Essentials At a Glance Instructor’s Manual Table of Contents Overview Objectives Teaching Tips Quick Quizzes Class Discussion Topics Additional Projects Additional Resources Key Terms Technical Notes for Hands-On Projects

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Guide to Networking Essentials, Fifth Edition 2-2 Lecture Notes Overview Chapter 2 offers an introduction to network design essentials. Students begin by learning about the basics of a network layout and about the standard networking topologies, as well as variations on these topologies. Next, they learn about the role of hubs and switches in a network topology. Finally, at the end of the chapter, students will be able to construct a basic network layout. Objectives Explain the basics of a network layout Describe the standard networking topologies Explain the variations on standard networking topologies Describe the role of hubs and switches in a network topology Construct a basic network layout Teaching Tips Examining the Basics of a Network Layout 1. Explain the basics of a network layout. Introduce the terms topology , physical topology , and logical topology . Teaching Tip For more information on network topologies, read http://en.wikipedia.org/wiki/Network_topology . 2. Stress that the topology has a significant effect on the network’s performance and growth, and equipment decisions. Understanding Standard Topologies 1. Briefly describe each of the three physical topologies in which networks are based: bus , star , and ring . 2. Make sure students understand the difference between a physical topology and a logical topology.
Guide to Networking Essentials, Fifth Edition 2-3 Physical Bus Topology 1. Use Figure 2-1 to explain how the physical bus topology works. Don’t forget to introduce the terms bus and backbone . Teaching Tip For more information on the bus network topology, read http://en.wikipedia.org/wiki/Bus_network . 2. Stress that the main weakness of this topology is that a single cable break can halt the entire network. 3. Explain why this topology is no longer a practical choice. 4. Signal Propagation . Describe how signals are propagated on a physical bus topology. 5. Signal Bounce . Use Figure 2-2 to describe the signal bounce phenomenon in a physical bus topology. 6. Cable Termination . Use Figure 2-3 to describe the role of a terminator . 7. Cable Failure . Use Figure 2-4 to explain how a cable break affects the signals transmitted in a bus. Logical Bus Topology 1. Explain the role of the logical bus topology. 2. Stress that technology has moved past the physical bus, but a logical bus topology is still in use on some physical topologies, in particular a star.

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