01. Protocol Architecture

01. Protocol Architecture - Protocol Protocol Architecture...

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rotocol Protocol rchitecture Architecture 1
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Outline ± Why protocol ± Design principles pen System Interconnection: OSI ± Open System Interconnection: OSI ± TCP/IP Communication Networks © Kang Xi, Polytechnic Institute of NYU 2
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Foundations of Communication ± Connectivity ² Moving bits from one device to another ± Agreements ² Common knowledge between individuals in communication ² Know how to react to a received data Communication Networks © Kang Xi, Polytechnic Institute of NYU 3
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Protocols for Conversation ± Share the same language ± Conversation w/o collision: speak+listen ± Some common knowledge Communication Networks © Kang Xi, Polytechnic Institute of NYU 4
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Protocols for Telegram EL536 boring EL536 boring NYC LA is boring is boring 2155 5523 … ± Protocols: ² Encoding/decoding rules ² Starting/ending of a telegram Communication Networks © Kang Xi, Polytechnic Institute of NYU 5
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Complex protocols / ± Telephone networks are relatively simple ata communication is complex ± Data communication is complex ² Multiple services ² Heterogeneous devices General Agreement: A MUST! Communication Networks © Kang Xi, Polytechnic Institute of NYU 6
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Decomposition for complexity omplex ystem subsys Complex System subsys ubsys subsys subsys Communication Networks © Kang Xi, Polytechnic Institute of NYU 7
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Communication protocol ± Communication is a tandem system ± Pick out a certain section as an function ntity entity ± Decompose the whole system into a set of protocols user1 tx channel rx user2 Communication Networks © Kang Xi, Polytechnic Institute of NYU 8
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Layered Architecture Application Application Transport Transport A layer Network Access Network Access Communication Networks © Kang Xi, Polytechnic Institute of NYU 9
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Principles for layering ± Functionality ² Group similar functions into the same layer implicity ± Simplicity ² Not too many, not too few layers ± Scalability ² Each layer is relatively independent ac aye s e a e y depe de Communication Networks © Kang Xi, Polytechnic Institute of NYU 10
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Network Access Layer ± Exchange of data between the computer nd the network and the network ± Sending computer provides address of destination ay invoke levels of service ± May invoke levels of service ± Dependent on type of network used (LAN, packet switched etc.) Communication Networks © Kang Xi, Polytechnic Institute of NYU 11
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01. Protocol Architecture - Protocol Protocol Architecture...

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