>>106354718
>but isn't this necessary ONLY if you have hundreds of servers
lol what
You need a switch to plug multiple computers in the same network. The smallest switches are nearly fucking free, you use them to plug multiple devices into the same network.

>using a standard ethernet cable connected to the router
The home "router" category of device basically performs a combo role of actual router + WiFi access point + switch at the very least. The so-called "LAN" ports on your router are basically working like a switch.