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Networks: OSI Reference Model1 International Standards Organization Open Systems Interconnect (OSI) Reference Model.

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Presentation on theme: "Networks: OSI Reference Model1 International Standards Organization Open Systems Interconnect (OSI) Reference Model."— Presentation transcript:

1 Networks: OSI Reference Model1 International Standards Organization Open Systems Interconnect (OSI) Reference Model

2 Networks: OSI Reference Model2 Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Network Layer Electrical and/or Optical Signals Application A Application B Data Link Layer Physical Layer Network Layer Data Link Layer Physical Layer Communication Network Figure 2.6Leon-Garcia & Widjaja: Communication Networks Copyright ©2000 The McGraw Hill Companies

3 Networks: OSI Reference Model3 Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Application A Application B data ah ph sh th nh dh bits dt Copyright ©2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication NetworksFigure 2.9

4 Networks: OSI Reference Model4 HTTP Request TCP Header Header contains source and destination port numbers Header contains source and destination IP addresses; transport protocol type IP Header Header contains source and destination physical addresses; network protocol type Frame Check Sequence Ethernet Header Copyright ©2000 The McGraw Hill Companies Leon-Garcia & Widjaja: Communication NetworksFigure 2.15

5 Networks: OSI Reference Model5 OSI versus TCP/IP Figure 1-21. The TCP/IP reference model.

6 Networks: OSI Reference Model6 OSI versus TCP/IP DCC 6 th Ed., W. Stallings Figure 1.11 DCC 6 th Ed., W. Stallings Figure 1.11

7 Networks: OSI Reference Model7 Seven OSI Layers

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