4 - modular view

4 - modular view - SUNY AT BUFFALO; CSE489/589 – MODERN...

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Unformatted text preview: SUNY AT BUFFALO; CSE489/589 – MODERN NETWORKING CONCEPTS; Fall 2010; INSTRUCTOR: HUNG Q. NGO 1 Last Lecture ! How to send data from end to end: two switching methods ! Circuit switching ! Packet switching ! Packet loss and delay in a packet switched network SUNY AT BUFFALO; CSE489/589 – MODERN NETWORKING CONCEPTS; Fall 2010; INSTRUCTOR: HUNG Q. NGO 2 This Lecture ! Modular view of the Internet ! Layering, protocol architecture ! The TCP/IP reference model SUNY AT BUFFALO; CSE 489/589 – MODERN NETWORKING CONCEPTS; Fall 2010; INSTRUCTOR: HUNG Q. NGO 6 What Is a Protocol? ! We have just seen an example of a protocol (the HTTP protocol) ! Protocol : ! A formal description of a set of rules and conventions that govern how peer entities on a network exchange information. ! Peer entities: same-level network entities like processes, routers, modems, … ! A protocol’s key elements: ! Syntax : data format, signal levels ! Semantics : control information and error handlings ! Timing : speed matching and sequencing SUNY AT BUFFALO; CSE 489/589 – MODERN NETWORKING CONCEPTS; Fall 2010; INSTRUCTOR: HUNG Q. NGO 7 What Is a protocol? a human protocol and a computer network protocol: Hi Hi Got the time? 2:00 TCP connection req TCP connection response Get http://www.awl.com/kurose-ross <file> time SUNY AT BUFFALO; CSE 489/589 – MODERN NETWORKING CONCEPTS; Fall 2010; INSTRUCTOR: HUNG Q. NGO 8 An Example Protocol: HTTP GET /dir/page.html HTTP/1.1GET /dir/page....
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This note was uploaded on 12/03/2010 for the course CS 489 taught by Professor Hungngo during the Fall '10 term at SUNY Buffalo.

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4 - modular view - SUNY AT BUFFALO; CSE489/589 – MODERN...

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