Is DNS required to be a role on an Active Directory server? Is it possible to run 2 servers that support DNS only and 2 for Active Directory? Or is AD required to be on a machine that runs DNS.
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It's not technically required, but it makes things a lot simpler to have your DCs act as DNS servers.
One of the best benefits is the ability to create AD-Integrated Zones and conditional forwards. This allows your DNS records to exist within AD and be replicated across your other DCs/DNS servers in your domain and even forest. Once all your forward lookup zones are AD-Integrated, bringing on a new DC/DNS by DCpromo automatically pulls in all the necessary records for those zones.
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