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Under the general tab the domain functional level and forest functional level is displayed on the screen.
What is your domain functional level. Get the active directory schema version using dsquery. There are some explanations with the functions up to windows server 2008 r2 and some on the differences between windows server 2008 r2 and windows server 2012. From the administrative tools menu select active directory domains and trusts or active directory users and computers.
In this lab i had the domain and forest functional level set to server 2016. If you have to revert to a lower functional level with a version of windows server that is earlier than windows server 2008 r2 you must rebuild the domain or forest or restore it from a backup copy. Get domain functional level using dsquery.
Feature set of a particular dfl will be available for a dc if it runs on the operating system version that is compatible with the functional level. With windows server 2012 and r2 it is possible to roll back forest and domain functional level with limitation as defined in table in the link. Functional levels are set at these default levels to give you the option of adding windows 2000 or windows server 2003 based domain controllers to your new windows server 2008 forest.
This was fine until a few days later when i needed to test an application that was not supported for functional domains and forest levels greater than server 2012r2. Active directory functional levels are controls that specify which advanced active directory domain features can be used in an enterprise domain. The enterprise domain is usually comprised of domain controller that run on different versions of the windows server operating system.
Rather than starting from scratch with this lab i decided to test lowering the functional levels from server 2016 to server 2012r2. Functional levels determine the available active directory domain services ad ds domain or forest capabilities. They also determine which windows server operating systems you can run on domain controllers in the domain or forest.
Right click the root domain then select properties. Dsquery cn schema cn configuration. I was able to.
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