Configuring the Required DNS Resource Records

Published: 26th July 2010
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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 CompTIA Nerwork+ Exam

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 controllers listed in the _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 prompt, type __ldap._tcp.dc._tasdcs.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 service (SRV) resource records used to support Windows Server N10-004

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:

%Sj«temroo/%System32ConfigNetlogon.dns. If you have installed DNS manu¬

ally 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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