IT Interview Questions:What are the requirements from DNS to support AD?
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IT Interview Questions:What are the requirements from DNS to support AD?
When you install Active Directory on a member server, the member server is
promoted to a domain controller.
Active Directory uses DNS as the location
mechanism for domain controllers, enabling computers on the network to obtain
IP addresses of domain controllers.
During the installation of Active
Directory, the service (SRV) and address (A) resource records are dynamically
registered in DNS, which are necessary for the successful functionality of
the domain controller locator (Locator) mechanism.
To find domain controllers
in a domain or forest, a client queries DNS for the SRV and A DNS resource
records of the domain controller, which provide the client with the names and
IP addresses of the domain controllers. In this context, the SRV and A
resource records are referred to as Locator DNS resource records.
When adding
a domain controller to a forest, you are updating a DNS zone hosted on a DNS
server with the Locator DNS resource records and identifying the domain
controller. For this reason, the DNS zone must allow dynamic updates (RFC
2136) and the DNS server hosting that zone must support the SRV resource
records (RFC 2782) to advertise the Active Directory directory service. For
more information about RFCs, see DNS RFCs. If the DNS server hosting the
authoritative DNS zone is not a server running Windows 2000 or Windows Server
2003, contact your DNS administrator to determine if the DNS server supports
the required standards. If the server does not support the required
standards, or the authoritative DNS zone cannot be configured to allow
dynamic updates, then modification is required to your existing DNS
infrastructure.
For more information, see Checklist: Verifying DNS before installing Active
Directory and Using the Active Directory Installation Wizard.
Important
The DNS server used to support Active Directory must support SRV resource records
for the Locator mechanism to function. For more information, see Managing
resource records. It is recommended that the DNS infrastructure allows
dynamic updates of Locator DNS resource records (SRV and A) before installing
Active Directory, but your DNS administrator may add these resource records
manually after installation. After installing Active Directory, these records
can be found on the domain controller in the following location:
systemroot\System32\Config\Netlogon.dns
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