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Networks: OSI Reference Model

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Presentation on theme: "Networks: OSI Reference Model"— Presentation transcript:

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

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

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

4 HTTP Request TCP Header IP Header Ethernet Header Frame Check Sequence
Header contains source and destination port numbers TCP Header 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 Networks Figure 2.15 Networks: OSI Reference Model

5 Networks: OSI Reference Model
OSI versus TCP/IP Figure The TCP/IP reference model. Networks: OSI Reference Model

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

7 Networks: OSI Reference Model
Seven OSI Layers Networks: OSI Reference Model

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