Mnemonic device

At Present, Some Teachers Need Dr. Phil

Explanation

This is a memory sentence to help you remember the 7 layers of the OSI network model, top to bottom. Take the first letter of each word: At Present, Some Teachers Need Dr. Phil → A-P-S-T-N-D-P, standing for (7) Application Layer, (6) Presentation Layer, (5) Session Layer, (4) Transport Layer, (3) Network Layer, (2) Data Link Layer, (1) Physical Layer.

Diagram of the 7 OSI model layers, stacked from Physical at the bottom to Application at the top, each with a short description — Diagram: Offnfopt, Wikimedia Commons (public domain)

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At Present, Some Teachers Need Dr. Phil

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