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William Stallings Data and Computer Communications 7th Edition

Need For Protocol Architecture. E.g. File transferSource must activate comms. Path or inform network of destinationSource must check destination is prepared to receiveFile transfer application on source must check destination file management system will accept and store file for his userMay need

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William Stallings Data and Computer Communications 7th Edition

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    1. William Stallings Data and Computer Communications 7th Edition Chapter 2 Protocols and Architecture

    2. Need For Protocol Architecture E.g. File transfer Source must activate comms. Path or inform network of destination Source must check destination is prepared to receive File transfer application on source must check destination file management system will accept and store file for his user May need file format translation Task broken into subtasks Implemented separately in layers in stack Functions needed in both systems Peer layers communicate

    3. Key Elements of a Protocol Syntax Data formats Signal levels Semantics Control information Error handling Timing Speed matching Sequencing

    4. Protocol Architecture Task of communication broken up into modules For example file transfer could use three modules File transfer application Communication service module Network access module

    5. Simplified File Transfer Architecture

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