If I connect my computers to a switch hub, will they be connected automatically in LAN games?

I have 6 computers, and I'm planning to network them If i connect them to a switch hub then to a router, do I have to configure something on each unit, in order for them to be connected to play LAN games like DOTA and counter- strike? or after I connect them to the switch hub then reformat them all, they will be connected automatically in LAN games?