Achint Setia, a developer on the DHCP team here at Microsoft, has a great presentation available discussing NAP + DHCP for Vista and Longhorn Sever. This is one of several enforcement options available for protecting your networking with NAP.

My favorite part of the presentation is the demo (TOC item 31). Enjoy!
http://support.microsoft.com/default.aspx?kbid=920630

For all things DHCP at Microsoft, including DHCP + NAP news:
http://blogs.technet.com/teamdhcp/

 

Jeff Sigman [MSFT]
NAP Release Manager
jeff.sigman@online.microsoft.com *

* remove the "online" to actually email me.