[Educational Question] Diffrent kinds of networks.

So, this one is going to be a little bit diffrent from the normal questions. I am a you could say that a CS student. I need to find the hardest division of Networks. (You know like you can divide by area : LAN,MAN,WAN etc.) and my teacher told me that i need to find one, that only network engineer can understand. (Also not a native speaker, so don't kill me that some terms may not be acurate)

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This are the ones that I tried:

-Area (LAN,MAN,WAN)
-Physical and logical topologies

-Wired and Wireless

-By communication models (P2P and Client-Server)

None of these worked so i scoured the internet and found these:

-Used Networking protocols (TCP/IP, NetBEUI,IPX/SPX)

-Accessibility (Intranet and Extranet)

But again no luck. So i am asking you, people of reddit beacuse, you may know harder ones.