ch05_CE - Guide to Networking Essentials Fifth Edition...

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Guide to Networking Essentials Fifth Edition Chapter 5 Making Networks Work
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Guide to Networking Essentials, Fifth Edition 2 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
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Guide to Networking Essentials, Fifth Edition 3 Understanding the OSI and 802 Networking Models The Open Systems Interconnection (OSI) reference model was proposed by the ISO Common framework for developers and students of networking to work with and learn from 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 IEEE 802 networking model provides detailed implementation specifications for a number of networking technologies Influential set of networking standards
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Guide to Networking Essentials, Fifth Edition 4 Role of a Reference Model Reference models and standards enable interoperability among layers Computer networking, computer compatibility, and networking features and functions can be daunting concepts to grasp However, they would be more difficult to comprehend if networking weren’t built on a common framework with the process separated into layers The OSI model and its seven-layer approach to networking provides this common framework
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Guide to Networking Essentials, Fifth Edition 5 OSI Reference Model OSI reference model: drafted in late 1970s by ISO; theoretical model for networks of all kinds By 1983, the draft became ISO Standard 7498 Model’s foundation: networking can be separated into a series of related tasks Each task can be conceptualized as a single aspect, or layer, of the communication process Reduces complexity of networked communications into series of interconnected tasks and activities “Divide and conquer” approach: relationship among tasks persists, but each can be handled separately, and its issues solved independently
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Guide to Networking Essentials, Fifth Edition 6 Understanding Layers The OSI reference model for networking clarifies many communications activities and related tasks and requirements to help in understanding what networks are and how they work Breaks down all the events that must occur for data to be addressed and formatted correctly before it can actually be delivered to its final recipient With a layered approach, one part of the process can change, sometimes drastically, while the rest of the process remains unchanged
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Guide to Networking Essentials, Fifth Edition 7 Structure of the OSI Reference Model A computer that accesses a network must have a protocol stack ( protocol suite ) TCP/IP IPX/SPX NetBEUI AppleTalk Protocols plus drivers equal network access
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Guide to Networking Essentials, Fifth Edition 8 Structure of the OSI Reference Model (continued)
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Guide to Networking Essentials, Fifth Edition 9 Structure of the OSI Reference Model (continued)
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Guide to Networking Essentials, Fifth Edition 10 Structure of the OSI Reference Model (continued)
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ch05_CE - Guide to Networking Essentials Fifth Edition...

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