If your two computers are in the same area and you don't want to use a cable, you can transfer files between them — even if they're on separate networks. (howtogeek.com)
Normally, if the network is being well - maintained, there should be no need to create separate networks, as every device will get exactly the bandwidth it needs. (mobilesyrup.com)
So the reds in a painting have their own separate network of connections. (bombmagazine.org)