Your contoso.com AD DS domain was created using domain controllers that run Windows Server 2025. You must add a domain controller running an older Windows Server release for a custom application. What is the oldest Windows Server version you can use for a domain controller in contoso.com?
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Correct answer: Windows Server 2016.
Why this is the answer
The forest functional level determines the oldest Windows Server version that can be used for a domain controller. Since the domain was created with Windows Server 2025 domain controllers, the forest functional level is Windows Server 2016. This means all domain controllers in the forest must be running at least Windows Server 2016. Therefore, Windows Server 2016 is the oldest version you can use. Windows Server 2019, 2022, and 2025 are all newer than 2016 and would also be compatible, but the question asks for the oldest possible version.
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