this post was submitted on 01 Jan 2026
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Once upon a time there were more protocols than just TCP/IP. You could have IPX/SPX, Baynes and others.
Hell. Even now with the introduction of Quic, it’s starting to change the use of TCP/IP, so having a general understanding of the layers in an abstracted manner let you map them to the different syntaxes that are out there. Kind of like programming languages.
We’ve also had UDP this whole time
Yup. Quic, for example, layers on UDP instead of TCP. It’s still an IP based protocol. But then you can also get things like FCoE which don’t even use TCP/UDP. Or even ATM which uses its own frame structure. There’s plenty of reasons to need to understand the OSI model.