The document provides an overview of the OSI model, which defines seven layers of network communication: physical, data link, network, transport, session, presentation, and application. Each layer performs a specific set of functions and provides services to the layer above it. The layered approach separates networking functions and allows extensibility through new protocols. The TCP/IP model combines some OSI layers for a simpler four-layer model of network communication.
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The OSI Model: An Overview of the 7 Layer Model
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The OSI Model: An Overview
Rachelle Miller
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