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Many computer systems are defined in terms of a layered architecture. For example, the Internet layered architecture is based on a five-layer model and the OSI Reference Model is based on a seven-layer architecture. Each layer provides functionally distinct services to the other layers: for example, one layer may be responsible for checking correct transmission of data, with the top layer providing a service to programs that use the architecture. Each layer draws on services provided by the next layer down.

Subjects: Computing.

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