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Logical Elements of Active Directory.Physical Elements of Active Directory

Logical Elements of Active Directory
                            The logical components of Active Directory are
important because they define how the computing enterprise or domain
network  will be administered.
There are four logical
components of Active Directory.                  
They are
• Domains
• Trees
• Forests
• Organizational units
Domains
                A Windows 2003 Active Directory
domain is a logical collection of users and computers. In other words,
it’s an organizational entity that groups together the objects in your
enterprise.
Trees
                In an enterprise, if we want to
have more than one domain to divide administration of users and computers of
different departments and offices of the enterprise, then we create trees.
              
A tree is set of two or more domains sharing common namespace. For
example, we can create a parent domain and then a child domain.
Forests
               A forest is made up of two or
more trees with trust relationships between them.
A forest lets you link together multiple domain trees in a
hierarchical arrangement. The goal in designing a forest is the same as when
designing a tree: to define and maintain an administrative relationship between
the domains.
Organization Units (OU)
                    An OU is smallest unit in a
domain network that can contain users, computers, groups, shared folders,
printers and group policy objects. You can apply group policy to an OU but you
can’t apply group policy on a Group. In other words, OU acts as separate
administrative units for administrating users and computers in a domain. You
can delegate administration of an OU to a user.
                Go to Active directory Users
and Computers, create an OU and right-click on the OU > Delegate Control to
give responsibility of this OU to an other user or administrator.
Physical Elements of Active Directory
                 There are main two physical;
elements of Active Directory:
·       
Domain Controller
·       
Site
Domain Controller (DC)
                Active Directory is an logical
item and this item must be stored somewhere physically. So Active Directory is
stored in a physical item called Domain Controller. In a domain, we can have
one or more DCs.
Sites
            The simple definition of a site is
a collection of one or more “well-connected” IP subnets. More importantly,
though, a site is a unit of Active Directory replication. If the domain
controller’s job is to store and replicate the Active Directory database, then
the site’s job is to govern how that replication occurs.

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