184.108.40.206 msDS-Behavior-Version: DC Functional Level
The msDS-Behavior-Version attribute is written on the nTDSDSA object representing a DC. The value is the highest domain or forest functional level that the DC is capable of supporting. A DC supports any domain or forest functional level less than or equal to its msDS-Behavior-Version.
The value of the msDS-Behavior-Version attribute on an nTDSDSA object changes during an operating system upgrade of that DC. The value of the msDS-Behavior-Version attribute never decreases.
The absence of the msDS-Behavior-Version attribute on an nTDSDSA object is equivalent to the msDS-Behavior-Version attribute on that object having the value zero.
The following values are defined.
Applicable domain controller operating system
Windows 2000 Server operating system
Windows Server 2003 operating system, Windows Server 2003 R2 operating system
Windows Server 2008 operating system
Windows Server 2008 R2 operating system
Windows Server 2012 operating system
Windows Server 2012 R2 operating system
Windows Server 2016 operating system
Windows Server v1709 operating system
Windows Server v1803 operating system
Windows Server v1809 operating system
Windows Server 2019 operating system
* Not available in AD LDS.