c# qr code Introduction to Active Directory in C#

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Introduction to Active Directory
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structure of other domains each domain can implement its own OU hierarchy. By adding OUs to other OUs, or nesting, you can provide administrative control in a hier archical fashion. As an administrator, you must create an OU structure to reflect your company s orga nization. See Lesson 3, Planning the Active Directory Infrastructure Design, to learn the basics of OU design. See 6, Implementing an OU Structure, to learn about implementing an OU structure. In Figure 1-5, the microsoft.com domain mirrors the organization of a shipping com pany and contains three OUs: US, Orders, and Disp, where Orders and Disp are nested within the US OU. In the summer months the number of shipping orders taken increases, and management has requested the addition of a subadministrator for the Orders department. The subadministrator must have permission only to create user accounts and provide users with access to Orders department files and shared printers. Rather than creating another domain, the request can be met by assigning the subad ministrator the appropriate permissions within the Orders OU.
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Figure 1-5 Using an OU to handle administrative tasks
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If the subadministrator is later required to create user accounts in the US, Orders, and Disp OUs, you could grant the administrator the appropriate permissions separately within each OU. However, because the Orders and Disp OUs are nested in the US OU, a more efficient method is to assign permissions once in the US OU, and allow them to be inherited by the Orders and Disp OUs. By default, all child objects (the Orders and Disp OUs) within Active Directory inherit permissions from their parents (the US OU). Granting permissions at a higher level and using inheritance capabilities can reduce administrative tasks. Trees A tree is a grouping or hierarchical arrangement of one or more Windows Server 2003 domains that you create by adding one or more child domains to an exist ing parent domain. Domains in a tree share a contiguous namespace and a hierarchical naming structure. Namespaces are covered in detail in the next lesson. Following DNS standards, the domain name of a child domain is the relative name of that child domain appended with the name of the parent domain. In Figure 1-6, microsoft.com
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Lesson 1
Active Directory Overview
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is the parent domain and us.microsoft.com and uk.microsoft.com are its child domains. The child domain of uk.microsoft.com is sls.uk.microsoft.com. By creating a hierarchy of domains in a tree, you can retain security and allow for administration within an OU or within a single domain of a tree. The tree structure easily accommodates organiza tional changes.
microsoft.com
uk.microsoft.com
us.microsoft.com
sls.uk.microsoft.com
Figure 1-6 A domain tree
As an administrator, you must create a tree structure to reflect your company s organi zation. See Lesson 3, Planning the Active Directory Infrastructure Design, to learn the basics of tree design. See 4, Installing and Managing Domains, Trees, and For ests, for details about creating trees. Forests A forest is a grouping or hierarchical arrangement of one or more sepa rate, completely independent domain trees. As such, forests have the following characteristics:
All domains in a forest share a common schema. All domains in a forest share a common global catalog. All domains in a forest are linked by implicit two-way transitive trusts. Trees in a forest have different naming structures, according to their domains. Domains in a forest operate independently, but the forest enables communication across the entire organization.
In Figure 1-7, the microsoft.com and msn.com trees form a forest. The namespace is contiguous only within each tree.
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Introduction to Active Directory
microsoft.com
msn.com
uk.microsoft.com
us.microsoft.com uk.msn.com
us.msn.com
sls.uk.microsoft.com
sls.uk.msn.com
Figure 1-7 A forest of trees
The forest functional level provides a way to enable forest-wide Active Directory fea tures within your network environment. Three forest functional levels are available: Windows 2000 (default), Windows Server 2003 interim, and Windows Server 2003. The Windows 2000 functional level allows a Windows Server 2003 domain controller to interact with domain controllers in the domain running Windows NT 4, Windows 2000, or Windows Server 2003. The Windows Server 2003 interim functional level allows a Windows Server 2003 domain controller to interact with domain control lers in the domain running Windows NT 4 or Windows Server 2003. The Windows Server 2003 functional level allows a Windows Server 2003 domain controller to interact only with domain controllers in the domain running Windows Server 2003. You can raise the functional level of a forest only if the domain controllers in the forest are run ning the appropriate version of Windows. See 3, Administering Active Directory, for details about raising forest functional levels. As an administrator, you must create a forest structure to reflect your company s orga nization. See Lesson 3, Planning the Active Directory Infrastructure Design, to learn the basics of forest design. See 4, Installing and Managing Domains, Trees, and Forests, for details about creating forests.
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