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I took this architecture from one of IBMs tutorials, if you pay attention you’ll see they have “TGEA client/server networking” dashed in blue, from the client to the server and vice-versa. That’s IBM though, TGEA is the name of their engine I think.
TGEA is now Torque 3D - and it was once a commercial game engine. Torque 3D is now open source and free under the MIT license, and TGEA is no longer available. You can find out more at www.garagegames.com if you’re really interested.
Unreal Engine supports all of the networking components you need to follow along with the example you linked from IBM’s site - you’ll just have to dig through the API to find matches for the functionality required.