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

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