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Special Edition Using Microsoft Active Directory by James Hudson, Sean Fullerton

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Finding a Domain Controller

Regardless of how you design the namespace, a DNS server is used by an AD client to find a DC. In this section, you look at one of the most important things DNS does for you: finding a domain controller.

Sites

When a client tries to find a DC for its domain, rather than taking one at random, it tries to find a DC in its site. (A site is one or more well-connected subnets.) The first site is created by default and is called Default-First-Site-Name. This site can be renamed, other sites can be created, and DCs can be moved into sites. A site is always associated with one or more IP subnets.

Finding a Domain Controller in a Site

A client, whether it is a workstation or server, first performs a lookup for a DC in its site. ...

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