What does the server check in the client when a player connects?

Question

Game development

Good afternoon, tell me, there are a bunch of Lineage, WoW servers, but in fact, to connect to any of them, you just need to specify the IP server in the connection file and it doesn’t matter what version of the game the user has?

Answer 1

Well, usually - checks the version.
In general, there is such a thing as a "data exchange protocol". Each game has its own. This is where you should watch it.