Your domain contoso.com was deployed using Windows Server 2022 domain controllers. You need to add a domain controller that runs an older version of Windows Server for a custom application. What is the oldest Windows Server release you can run as a domain controller in contoso.com?
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Correct answer: Windows Server 2012 R2.
Why this is the answer
The forest functional level determines the oldest Windows Server version that can operate as a domain controller. Since the existing domain controllers are Windows Server 2022, the forest functional level is at least Windows Server 2016 (the default for new Server 2022 forests). However, a Windows Server 2022 domain can support a forest functional level as low as Windows Server 2008 R2. If the forest functional level is Windows Server 2008 R2, then Windows Server 2012 R2 can be added as a domain controller. Windows Server 2016, 2019, and 2022 can all be domain controllers in a Windows Server 2022 domain, but they are not the oldest possible version.
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