ch05_CE - Guide to Networking Essentials Fifth Edition 5-1...

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Guide to Networking Essentials, Fifth Edition 5-1 Chapter 5 Making Networks Work 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 5-2 Lecture Notes Overview Chapter 5 describes the role of the OSI reference model and the IEEE 802 networking model. Students learn about the importance of layered network designs and understand how each of the layers of the OSI model works. They learn about the encapsulation process as data moves across layers and how frames function and are created. Finally, students learn about the IEEE 802 networking model and related standards, including its relationship with the OSI reference model. Objectives Explain the OSI reference model layers and their relationship to hardware and software Describe the function and creation of a data frame Explain the IEEE 802 networking model and related standards Teaching Tips Understanding the OSI and 802 Networking Models 1. Explain the role of the OSI model (proposed by the ISO ). Explain why the attempt to develop a working set of protocols and technologies based on the OSI model, and to put those efforts into common use, never materialized. Teaching Tip Explain that ISO is not an acronym; it comes from the Greek prefix iso, which means “equal” or “the same.” The ISO, based in Geneva, Switzerland, is a network of national standard institutes from 140 countries. The expanded name differs from language to language. For example, in France the organization is the Organisation Internationale de Normalisation. The term ISO gives the network of institutes a common name. Teaching Tip Note that the set of protocols that was developed to conform to the OSI model is called ISO. You can view the fruits of those labors at: www.protocols.com/pbook/iso.htm . 2. Explain that the IEEE 802 networking model provides detailed implementation specifications for a number of networking technologies.
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Guide to Networking Essentials, Fifth Edition 5-3 Role of a Reference Model 1. Explain the importance of having a networking reference model. OSI Reference Model 1. Provide a brief history of how the OSI reference model came to be. 2. Explain that the model’s foundation is that networking can be separated into a series of related tasks. Explain that layering follows a “divide and conquer” approach. 3. Understanding Layers . Explain the importance of having a layered networking reference model. Use an analogy of creating and delivering a letter through the U.S. mail to help explain the layered communication process.
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ch05_CE - Guide to Networking Essentials Fifth Edition 5-1...

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