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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

How do you manually create SRV records in DNS?
this is on windows server go to run ---> dnsmgmt.msc
rightclick on the zone you want to add srv record to and choose "other new record"
and choose service location(srv).....

For Question & Answer on DHCP and Its process etc.  click here

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