Multiplayer - Dedicated Server

Hi,

i worked with Unity for a couple of months and i want to try UE4 now.

I’m planing a little multiplayer game with a dedicated server.
I don’t undersand how the server is working with the UE. To prevent cheating, the server has to check any data it gets from the client, e.g. position data. So the server have to know the map. How is this done in UE4?

Is there a good guide how to do such things?