The “TCP/IP model” is a common but informal name for what is probably more properly termed the “Internet protocol suite”. UDP is included.
I’m actually not sure where QUIC fits in though. Wikipedia’s pages on both the IP suite and the OSI model say it’s on the transport layer of the IP suite, and layer 4 of OSI, but so is UDP. So I guess it’s another example of how the OSI model is more of a theoretical idea than something that represents reality?
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.
We’ve also had UDP this whole time
The “TCP/IP model” is a common but informal name for what is probably more properly termed the “Internet protocol suite”. UDP is included.
I’m actually not sure where QUIC fits in though. Wikipedia’s pages on both the IP suite and the OSI model say it’s on the transport layer of the IP suite, and layer 4 of OSI, but so is UDP. So I guess it’s another example of how the OSI model is more of a theoretical idea than something that represents reality?
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.