Access Point Authentication Dot1x

I am installing a WLAN. I have configured a RADIUS server for authenticating my clients etc. I am confused about one thing though - in addition to configuring my access point to use this RADUIS server, there is a tab for AP Authentication which appears to be for Dot1x authentication. I am using a Cisco 1240 AP. I am trying to determing what this is for - my research is telling me this is to be used if I am using switch port security, but I want to be sure. Insight is much appreciated.
ainselybAsked:
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naykamConnect With a Mentor Commented:
Its used for port based (not just physical switches) authentication with radius. Its the authorization of clients onto the wireless network.
Best description:

http://en.wikipedia.org/wiki/802.1x 
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