Most routers have one WAN port, but you'll need as many LAN ports as you have wired devices. If you have more wired devices than can fit on a router, you can plug them all in using a wired switch. A switch is like a power strip for your router: it lets you plug in more devices than the router originally allowed.our router is the glue that holds your home network together. It connects all your computers to one another, either through Ethernet cables or a wireless connection. A router is different than a modem: your modem connects you to the internet, while your router connects your computers to one another.