How to determine the level of the OSI protocol model?

Question

Computer networks

It may be a strange question, but still people often ask:

What model does XDR work on?

Can this be determined at all by some criteria, or does everything need to be known clearly from memory?

Answer 1

External Data Representation

representation

presentation

Here is confirmation.

Still, people often ask:

For example, it is difficult for me to perceive as an engineer with practical experience a person who takes the seven-level model too seriously.

This can generally be determined by some criteria

What for? What will it give? XDR is a layer six protocol, and what follows from this? If the goal is to pass an interview, then it is easier to learn popular options. I think that if you look at this legacy of the 70s (seven-level model) for a very long time, then you can probably see some logic. How this is applied in practice, I do not know. I believe that modern protocol stacks (HTTP over TCP over IPv4 over Ethernet) are more clearly described by the 4 layer model of TCP/IP. Of course, I can assume that in rare cases (X-stack), the OSI model clearly reflects the protocol stack and gives some important consequences that are applicable in practice. Too bad I haven't come across such cases.