You need to know the seven layers in sequence, either top-to-bottom or bottom-to-top. Here are some mnemonic phrases to help you remember the layers of the OSI model: "Please Do Not Throw Salami Pizza Away" — bottom-to-top. If you don't like salami pizza, then how about seafood or spinach pizza instead? "All People Seem To Need Data Processing" — a top-to-bottom reminder. "Please Do Not Tell Secret Passwords Anytime" — Another bottom-to-top phrase "APS Transports Network Data Physically" — APS refers to Application, Presentation, and Session. This one separates the upper and lower layer groups.
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