At what point is DNS connected?

Question

Computer networks

Between the transport and network layers of the OSI model?

Answer 1

DNS - L7 protocol, if you're talking about OSI.
Another issue is that after dns issues a response, a new connection begins (already to the http server, for example), which again goes through the entire stack.

Answer 2

DNS does not connect if it is not asked programmatically. Enough IP addressing. Actually, DNS is the same as SSH or HTTP, it does not differ from them, except that it runs over UDP. Accordingly, this is an application protocol (OSI 7).
Usually built into the standard network library (for convenience) - calls to GetHostAddresses (mastday) or gethostbyname (trueway).

Answer 3

because The 7-level osi model is artificial and far-fetched, so it can be attributed to the session :)