di*rec*to*ry ser*vice n : the format used by an operating system to identify and organize objects on the network
Before Windows 2000 and Windows Server 2003 were released, Windows NT 4 was the operating system of choice in businesses of many sizes. Large companies and companies with complex administrative structures found that the NT domain structure became unwieldy. NT domains did not scale particularly well, and allowed no more than 40,000 total accounts-users, computers, and groups combined. Moreover, managing and administrating large multidomain networks is difficult. Because of this, Microsoft introduced the Active Directory in Windows 2000, and it is still used with Windows Server 2003. The Active Directory can replace NT domains, but also can serve as an upgrade that coexists with existing NT domains.
In this chapter, you will be introduced to the following information:
Features of the Active Directory
Domains
Organizational units
Trees and forests
Trusts
Site Links
Domain controllers
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