If you plan to use Active Directory, the servers must be able to resolve hostname and server records in the Active Directory portion of the domain namespace. For example, if your appliance resides in the domain example.com and the Active Directory portion of the namespace is redmond.example.com, your nameservers must be able to reach an authoritative server for example.com, and they must provide delegation for the domain redmond.example.com to one or more Active Directory servers serving that domain. These are requirements imposed by Active Directory, not the appliance itself. If they are not satisfied, you will be unable to join an Active Directory domain.
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