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Why Do Some XP Machines Show Up In NAC As "Windows" Rather Than As Windows XP

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TitleWhy Do Some XP Machines Show Up In NAC As "Windows" Rather Than As Windows XP
Question
When looking in NAC Manager at the Device Type column some Windows XP devices are displayed as "Windows" rather than as "Windows XP" or "Windows XP SP2" or "Windows XP SP3".  Why is this?
Environment
All NAC platforms
Answer
This is due to the OS Fingerprint designed by Microsoft being such that the fingerprint matches as a duplicate, across two or more OS types.  

For example:

Windows XP (including XP SP2 and XP SP3) and Windows Server 2003 may sometimes have the same exact fingerprint.  So during their DHCP Discover or Inform process, NAC sees that the fingerprint matches two possible OS Types in its database, so when this occurs NAC is designed to resolve and display the OS simply as "Windows".  
Additional notes
This may also affect any rules that contain the Device Type Group:  "Windows".

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