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MCSE: Windows 2000 Exams in a Nutshell by Paul Murphy, Michael Moncur

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DNS for Active Directory

Domain Name Service (DNS) is the naming scheme used on the Internet. Windows 2000 abandons the NetBIOS naming scheme used in previous versions of Windows, replacing it with the standard DNS system. You’re probably already familiar with the DNS dotted name format. An example would be www.oreilly.com.

The top-level domain in this address is “com,” meaning it is a commercial enterprise. Top-level domain names like com, gov, edu, and org are shared by many domains. The second-level domain is the unique descriptive name, “oreilly.” The final part of this fully qualified domain name (FQDN) is the hostname, “www.”

The FQDN can also accommodate extra names if a subdomain is involved. If there were a computer named “elephant” in the animals subdomain of the oreilly.com root domain, the FQDN of the elephant computer would be elephant.animals.oreilly.com.

The naming scheme for DNS is called a namespace. There are two types of DNS namespaces, contiguous and disjointed. All the names in a contiguous namespace ...

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