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The OSI Model: basic principles of layered architecture: each layer means different layer of abstraction, each layer should perform a well defined function, the functions of layer should promote standardization, the information flow across the interfaces should be minimized, the number of layers should be large enough to separate functionality and small enough to keep the architecture under control, introduced in 1983, the OSI model has seven layers, the OSI model is not a network architecture, it does not specify the exact services ant protocols.

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