This document describes the seven layers of the OSI model from top to bottom: the application layer, presentation layer, session layer, transport layer, network layer, datalink layer, and physical layer. The layers are ordered from highest level abstraction to lowest level abstraction.

2. 1 Application Layer

3. 2 Presention Layer

4. session layer)
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5. transport layer)

6. network layer)

7. datalink layer)

8. physical layer)
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