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The Osi Model
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  • 1. The OSI Model Keith R. Barry Strayer University CIS 532
  • 2. The Seven Layers
    • Application
    • Presentation
    • Session
    • Transport
    • Network
    • Data Link
    • Physical
  • 3. Application Layer
    • Topmost Layer
    • User-interface: How the user communicates with the network
    • Responsible for interprocess communication
  • 4. Presentation Layer
    • Performs data compression and encryption
    • Essentially interprets data for use in the Application Layer
  • 5. Sessions Layer
    • Controls the connections/dialogues between computers on a network.
    • Utilizes checkpointing, adjournment and termination procedures in both half & full-duplex to control these connections.
  • 6. Transport Layer
    • Provides clear, transparent transfer of data so that upper level layers do not have to concern themselves with data reliability.
    • Data Packet switching is entirely handled on this layer.
    • Network devices such as Routers operate on this layer.
  • 7. Network Layer
    • Ethernets operate on this layer.
    • The Network Layer and Transport Layer can sometimes be confused; however, the Networking Layer deals with complex networking matter whereas the Transport Layer reside on the network itself.
    • Routing and Routers reside on this layer.
  • 8. Data Link Layer
    • This Layer provides procedural and functional means to transfer data from one network entity to another.
    • HDLC and ADCCP are protocols on this layer.
    • Networking devices such as bridges and switches operate on this layer.
  • 9. Physical Layer
    • Defines all electrical and physical specifications for a device on a network.
    • Devices like hubs, repeaters and network adapters operate on this layer.
    • A major function of this layer is the establishment and the termination of a connection with a network.