Configuring the Required DNS Resource Record
Computers joining an Active Directory domain require the following resource records in DNS to locate an Active Directory domain controller:
_ldap.J.cp.dc._msdcs.DNSDomamName service (SRV) resource record, which
identifies the names of the domain controllers that serve the Active Directory domain. DNSDomainName is the DNS name of the Active Directory domain the computer is attempting to join.
A corresponding address (A) resource record that identifies the IP addresses for the domain certification provider listed in _ldap._tcp.dc._msdcs. DNSDomainName SRV resource record.
To verify the presence of DNS resource records needed to join an Active Directory domain, complete the following steps:
1.Click Start, and then click Command Prompt.
2.Type nslookup and press Enter.
3.At the Nslookup prompt, type q=srv and press Enter.
4. At the next free Cisco practice questions prompt DNSDamainName. The DNS query for resource records specified in the Nslookup command set q=srv returns both SRV and A resource records.
5. Review the output and determine if all domain controllers in the Active Directory domain that this computer is attempting to join are included and registered using valid IP addresses. In some cases, you might need to manually add or verify reg?istration of the CompTIA Nerwork+ Certification (SRV) resource records used to support Windows Server 2003 domain controllers.
6. If you need to add the SRV resource records that have been created for a domain controller, open and view the Netlogon.dns file, created by the Active Directory Installation Wizard when a server computer is promoted to a domain controller.
Netlogon.dns can be found at the following location on a domain controller:
If you have installed DNS manually or if your DNS solution does not support dynamic update, you must manually enter these records on your DNS server(s).
Practice: Configuring a Static IP Address and Preferred DNS Server
In this practice, you configure a static IP address and preferred DNS Server for your two practice servers, Server and Server2. You will use these servers to complete exer?cises throughout this training kit.
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