Linksys Range extender Configuration-
In mostly extenders you will get LED on the front which gives you the information about POWER and Wi-Fi Set up. If the Led blinks with white colour is means Power is on and it can also mean up gradation of firmware or rest on factory setting. Solid white colour means you can use your device. If there is any problem with network setup it will blink with some different colour.
You will see WiFi protected switch in some version like Linksys RE6500, it also contains Ethernet Port with which you connect your entire wireless network. This Ethernet Port can also be used to send or receive data.