In a typical wireless-type of router, it has 4 LAN ports of the same color found at the back of the device. Separated to it and with a different color is the WAN port that allows you to connect to a Wide Area Network. This is commonly used if you are using wifi internet connection. It also has a small antennae. The range of which it can transmit data depends on the brand you are using. But pretty much, it can cover even a huge home.