Classes of functionality are realized in all software development through all and any standardized communication protocols.Įach layer in the OSI model has its own well-defined functions, and the functions of each layer communicate and interact with the layers immediately above and below it, unless the layer does not have layers below or above. Each intermediate layer serves a class of functionality to the layer above it and is served by the layer below it. The model partitions the flow of data in a communication system into seven abstraction layers to describe networked communication from the physical implementation of transmitting bits across a communications medium to the highest-level representation of data of a distributed application. In the OSI reference model, the communications between a computing system are split into seven different abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. The Open Systems Interconnection model ( OSI model) is a conceptual model that 'provides a common basis for the coordination of standards development for the purpose of systems interconnection'.
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