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Figure 7-1 The process of resolving a domain name to an IP address
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AD and DNS share the same central OU, called a domain For those familiar with Windows NT 4, Windows 2000, or Windows Server 2003, the domain concept should be a familiar one A domain is a central authentication and directory service that contains all the information for a group of computers NT 4 had a number of significant limitations in the utilization of domains Primarily, domains were not actual directory servers, because they contained only users, groups, and computers in a nonhierarchical structure Although all computers were able to use the central repository of information for authentication issues, the directory was not available for object location or resource management In AD, the core features
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and look of legacy NT domains are still present, but they have been greatly extended Among the many enhancements, which will be discussed over the course of this chapter, is the ability of AD domains to scale to virtually any size, as opposed to the 40,000-object limit placed on NT domain structures Another enhancement is AD s ability to form transitive two-way trusts with other domains in the network (this will be discussed further, later in the chapter) The close integration between AD and DNS can, at first, be a little confusing Looking at AD and DNS, it is easy to think they are actually the same thing, because they use the same names and naming scheme However, this is not true In actuality, DNS and AD are separate directory services that are using the same names for different namespaces Each directory contains different objects, and different information about the objects in its own database However, those object names, as well as the directory structure, often are identical Every Windows Server 2008 computer has an FQDN This is a combination of its own computer name and the domain name of the domain in which it currently resides For example, Windows Server 2008 computers in the McGraw-Hill domain may very well have a computer name equal to computernamemcgraw-hillcom However, that same computer may in fact be a member of the subdomain of editorialmcgraw-hillcom In this case, the computer s FQDN would actually be computernameeditorialmcgraw-hillcom
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A DNS directory doesn t really store objects in its database Rather, DNS stores domains, the access information for each domain, and the access information for the objects (such as servers and printers) within the domain The access information is normally just the FQDN and the related IP address All queries for an object s IP address will match the FQDN in the request to the FQDN index in the DNS directory and return (resolve to) the IP address In some cases, the access information (or resource reference) simply points to another object (or resource) within the same or a different DNS domain A standard DNS domain is not capable of reversing this process by returning an FQDN when provided with an IP address To make this kind of resolution possible, a reverse lookup zone is required, as discussed in 6 These domains are referenced as in-addr-arpa domains within the DNS hierarchy Among the other special functions of DNS that add features to a network is the Mail Exchanger reference that can be added to a DNS domain name A Mail Exchanger reference (referred to as MX) enables mail servers to locate the mail servers of other domains to allow for the transferring of e-mail across the Internet
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AD services contain a lot more information than what is available in DNS directories, even though the names and structure are nearly identical AD resolves all information requests for objects within its database using LDAP queries The AD server is able to
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