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See Figure gif on page  gif.

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Figure: The Network Models

The network has its foundations in the OSI seven layers of physical, data link, network, transport, session, presentation, and applications. This layering has not been precisely followed in the Internet and a more modern view would collapse the Internet into four layers of physical link, network, transport, and applications.

Ronald LeRoi Burback
Wed Jul 30 15:24:07 PDT 1997