c# barcode scanner text box The Structure of Active Directory in Software

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The Structure of Active Directory
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There are various OUs within AD that have very specific roles within the network These roles are established via the schema To administer and configure an AD network, you need to understand what each of these OUs is and the role that each plays within the network Active Directories are made up of one or more domains When the first AD server is installed, the initial domain is created All AD domains map themselves to DNS domains, and DNS servers play a crucial role within any AD domain
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Domains are at the core of all Windows NT/2000/Windows Server 2003/2008-based network operating systems This section looks at the structure of domains within AD, as well as the various factors involved in creating multiple domains within a network Domains in AD delineate a partition within the AD network The primary reason for creating multiple domains is the need to partition network information Smaller networks have very little need for more than one domain, even with a network spread across multiple physical sites, since domains can span multiple Windows Server 2008 sites
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(The site concept is covered in more detail later in this chapter) However, there are still reasons to use multiple domains within a network: Provide network structure Unlike in legacy NT domains, there is no real limit to the number of objects that can be added to an AD domain running in native mode For this reason, most networks do not need to establish separate domains for each business unit However, in some very large networks, various political factors may necessitate multiple domains For example, one company may own several subsidiary companies that are completely autonomous from the parent company A central AD shared between the companies provides numerous benefits; a shared domain may not make as much sense In this case, a separate domain can be set up for each company Replication AD servers contain information only about their own domain Global catalog servers are required to publish information between domains for user access This means that all objects within a domain are replicated to all the other domain controllers, but external resources are replicated only between global catalog servers In large networks spread across multiple WAN links, each physical site should be its own domain, to ensure that unnecessary replication traffic does not consume the limited bandwidth of the WAN links Security and administration Although AD provides the appearance of a central network infrastructure to the users of the network, administrative abilities and user permissions will not cross domain partitions This limitation is overcome through the use of global and universal groups and trust relationships, but domains are truly separate administrative groups that may or may not be linked together Delegation of administration Although the delegation of administrative authority throughout the network makes multiple domains easy to handle, and Windows Server 2008 provides a number of administrative tools, there still may be benefits for some networks in splitting domains along the lines of administrative authority and responsibility
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Besides domains, AD is composed of forests, trees, and other custom OUs Each of these OUs exists on a specific level of AD s hierarchy, beginning with the uppermost container, forests A forest is the highest OU within the network and can contain any number of trees and domains All domains within a forest share the same schema and global catalog In essence, forests are similar to DNS s root container Most organizations implementing AD will have only one forest; in fact, smaller organizations that have only one domain may not even realize the existence of the forest, because all functions appear to exist on the domain level only In effect, the forest is used as the main directory for the entire network The forest encompasses all the trees, domains, and other OUs, as well as all the published information for all the objects in the forest, as you can see next:
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