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Network Simulator which one ? (FLOSS)
(programming.dev)
Community for discussing enterprise networks and the ensuing chaos that comes after inheriting or building one.
Packet tracer is definitely not OSS nor free as in speech. But it is probably your best bet for something to get started with. You can go on netacad and get it for free together with the self-paced introduction to packet tracer course. I'm not trying to shrill for Cisco, they're a soulless company that exploits their position to extort insane prices. But PT is kinda nice, IF! all you want is to build simple networks and you don't care about being vendor agnostic or only running FOSS.
PS: and cisco? 2900€ for a 24port l3 switch? GTFO, a mikrotik crs326 can do the same and is 200€ and it doesn't require a DNA-center to enable licensing, why? BECAUSE IT DOESN'T REQUIRE ADDITIONAL LICENSES!!1!one!