Network topology?

Hey everyone,
I'm pretty new to networking, and I've got this task to map out my company's network topology. To be honest, it feels a bit like a school project – drawing diagrams based on guesses. I'm aiming for something more solid to impress the higher-ups.
I gave nmap a go, running a /24 range scan, but the results weren't really what I needed. Then I tried netdiscover, which got me some MAC addresses and vendor info, but I'm kinda …

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