The WugFresh Nexus Root Toolkit has always been the easiest and fastest way to Root your Nexus device. It does much more than root your Nexus though. It also allows you to quickly install a custom recovery, flash a stock image, and unbrick your phone. Other features include backing up your device, running commands, and more.
The NRT now supports the latest and greatest version of Android! This means you will be able to flash download and flash the new build automagically through the kit. Once you have the update installed you will be able to root it, and if you somehow flash the wrong thing to your device and brick it you will be able to unbrick your phone! Grab the update inside of the toolkit.
via Wugfresh.com