what setup do u have now ?
i assume modem for internet router computer
for lan without internet u need:
computers,hub/switch with minimum 2 ports (i think 5 ports are the real minimum u can find) and two lan cables. if you want more computers added u need more cables and for each computer another port
for lan with internet u need:
router with dhcp enabled
router with free ports or wifi.
cables for computers unlimited depending on ips for wifi
and if more computers needed u can add a switch/hub.
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