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Easy way to remember the OSI model (sh.itjust.works)
submitted 11 months ago by to c/programmer_humor@programming.dev
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[–] 25 points 11 months ago (2 children)

ISO is a theoretical model on how things work, suitable for teaching and for reference. In reality, there are only 4 layers and not the finely chiseled concern-separating layers at the bottom.

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  • [–] 7 points 11 months ago* (last edited 11 months ago) (1 child)

    ISO is an organization. OSI is a model.

    Edit: there are also definitely more than four “layers” (standard handoff points).

    • Physical involves the media and transmission format (e.g. EMF, waveform, etc)

    • data link involves multiplexing and addressing on the local segment

    • Network involves beyond-segment addressing

    • Transport involves standard endpoint communication methods (tcp/udp)

    Are you implying this is where everything ends?

    What about application level multiplexing (sockets)?

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