Which mnemonic can be used to remember the OSI layers?

• A. Please Do Not Throw Sausage Pizza Away
• B. All layers form a single protocol
• C. Layers Always Use Data Routing
• D. Never Castle Stuff Alone

Answer: (A)

Remembering the OSI layers is made easier with a mnemonic that maps each layer to the first letter of a word in a phrase. The sentence “Please Do Not Throw Sausage Pizza Away” gives the letters P, D, N, T, S, P, A in that order, which lines up exactly with Physical, Data Link, Network, Transport, Session, Presentation, and Application from bottom to top. Because the phrase mirrors both the number of layers and their correct sequence, it’s a reliable and handy way to recall the stack during quizzes or study. The other options either state an incorrect idea (that all layers form a single protocol) or are just nonsensical phrases that don’t map to the layer names, so they aren’t useful for remembering the OSI model.