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Note for Data Communication and Computer Network - DCCN By amIndian

  • Data Communication and Computer Network - DCCN
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Note for Data Communication and Computer Network - DCCN By amIndian

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Data and Computer Communications Chapter 2 – Protocol Architecture, TCP/IP, and Internet-Based Applications Eighth Edition by William Stallings Lecture slides by Lawrie Brown

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Protocol Architecture, TCP/IP, and Internet-Based Applications ➢ To destroy communication completely, there must be no rules in common between transmitter and receiver—neither of alphabet nor of syntax —On Human Communication, Colin Cherry

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Need For Protocol Architecture ➢ data exchange can involve complex procedures, cf. file transfer example ➢ better if task broken into subtasks ➢ implemented separately in layers in stack ⚫ ⚫ each layer provides functions needed to perform comms for layers above using functions provided by layers below ➢ peer layers communicate with a protocol

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Key Elements of a Protocol ➢ syntax - data format ➢ semantics - control info & error handling ➢ timing - speed matching & sequencing

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