Linksys AC1200 Setup is the process of setting up and installing a Linksys AC1200 range extender to improve Wi-Fi coverage in your house or place of business. In order to reduce dead zones and offer a better, more dependable Wi-Fi connection in places where the signal is weak or nonexistent, the Linksys AC1200 extender is a device that is intended to increase the range and signal strength of your existing wireless router.