Open system interconnection reference model

Open system interconnection reference model

The open system interconnection (OSI) reference model describes how information from a software application in one computer moves through a network medium to a software application in another computer.the osi reference model is a conceptual model composed of seven layers,each specifying particular network functions.the model was developed by the interneational organization fo rstandardization (ISO) in 1984, and it is now considered they primary architectural model for intercomputer communications. Tha osi model divides the tasks involved with moving information between networked computers into even smaller, more manageable task groups.a task or group of tasks is then assigned to each of the seven osi layers.each layer is resonably self contained so that the tasks assigned to each layer can be implemented independently.this enables the solutions offered by one layer to be updated without adversely affecting the other layers.the following list details the seven layers of open system interconnecion (OSI) reference model:

·                     Layer7_____________Application

·                     Layer6_____________Presentation

·                     Layer5_____________Session

·                     Layer4_____________Transport

·                     Layer3_____________Network

·                     Layer2_____________Data Link

·                     Layer1_____________Physical

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