Seven Layer OSI reference model network stack

Please Do Not Throw Sausage Pizza Away - Freeze the Pizza*
Top down   7   Application   6   Presentation   5   Session   4   Transport   3   Network   2   Data   1   Physical		Bottom Up   1   Physical   2   Data   3   Network   4   Transport   5   Session   6   Presentation   7   Application
*Humor: The additional layers at the top are: Finance, and Politics

Examples

1. Physical -- wires, pidgeons, fiber
2. Data - IP, IPX
3. Network - TCP, UDP; ipx, sfx
4. Transport
5. Session
6. Presentation
7. Application

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OSI Tutorial - local copy here