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The OSI
Reference Model
provides a model for computer networking. The OSI Reference Model
was defined by the International Standards Organization (ISO) and
consists of seven layers. Each layer has a task to perform. The
layers are: Application, Presentation, Session, Transport, Network,
Data Link, and
Physical.
The layers from Application through Network generally are
implemented in software. The Data Link and Physical layers are
implemented with both hardware and software. Table 2.1 outlines the
responsibilities of these seven layers. |
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