I have a pretty simple network with a Windows 2016 domain controller. Can I use a server with Windows 2012 R2 as a secondary domain controller?
The Domain/Forest Functional Level of existing DC is Windows Server 2016.
If it is possible, will there be missing features, or replication or any other issues?
If it is not possible, what would be a good solution? Lowering the Domain Functional Level of existing DC? What should be considered if I want to do so? How this could affect the current domain?