12 - Protocols and layering Network protocols and software...

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Protocols and layering Network protocols and software Layered protocol suites The OSI 7 layer model Common network design issues and solutions
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The need for protocols Basic communication hardware can transfer bits from one place to another Communication software provides a convenient high level interface for application programmers do not have to deal directly with hardware can run over different hardware A set of rules for exchanging messages is a network protocol
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Protocol suites Rather than having a single giant protocol, protocols tend to be structured as suites of specific protocols design and testing is easier extension and updating is easier selection and combination becomes possible
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Layering The most common approach to designing protocol suites Each layer deals with a different level of abstraction and communicates with the layers above and below through a standard interface There might be several alternatives for each layer
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Example - the OSI 7 layer model ISO model for standardising all networks
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12 - Protocols and layering Network protocols and software...

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