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what is domain controller ?
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Answer Posted / lokesh sharma
Primary domain controller (PDC) and backup domain controller
(BDC) are roles that can be assigned to a server in a
network of computers that use the Windows NT operating
system. Windows NT uses the idea of a domain to manage
access to a set of network resources (applications,
printers, and so forth) for a group of users. The user need
only to log in to the domain to gain access to the
resources, which may be located on a number of different
servers in the network. One server, known as the primary
domain controller, manages the master user database for the
domain. One or more other servers are designated as backup
domain controllers. The primary domain controller
periodically sends copies of the database to the backup
domain controllers. A backup domain controller can step in
as primary domain controller if the PDC server fails and can
also help balance the workload if the network is busy enough.
In Windows NT, a domain combines some of the advantages of a
workgroup (a group of users who exchange access to each
others' resources on different computers) and a directory (a
group of users who are managed centrally by an
administrator). The domain concept not only allows a user to
have access to resources that may be on different servers,
but it also allows one domain to be given access to another
domain in a trust relationship. In this arrangement, the
user need only log in to the first domain to also have
access to the second domain's resources as well.
In a Windows NT network, not all servers need to be a PDC or
BDC. A server can be designated as a member server whose
resources become part of a domain without having a role in
the logon process.
Setting up and maintaining PDCs and BDCs and domain
information is a major activity for the administrator of a
Windows NT network. In Windows 2000, the domain controller
concept is retained but the PDC and BDC server roles are
generally replaced by the Active Directory.
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