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A tree is a group of domains linked via trust relationships and sharing the same namespace, global catalog, and schema The tree has an uppermost domain (parent), and may have domains under it (children domains) in the tree hierarchy, linked via Kerberos trusts
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Trees or domains that do not share a common namespace can be linked together via one-way trusts to form a forest For example, if veltecom and microsoftcom were linked by a trust relationship but shared a common schema and global catalog, the pair would be considered a forest By default, trust relationships are formed by the tops of the trees; however, the trusts can be created to form alternate pathways for security measures
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Windows 2000 uses multimaster replication within domains to keep the AD current Instead of having one central computer (PDC) for the domain, which is replicated to subordinate servers (BDCs) (as is done in NT 40), Windows 2000 treats all DCs as peers If you can update a record on any DC, it will update all Domain Controllers after a time This way, all DCs have the same database, and users can update the AD on any DC
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Figure 1-1 illustrates many of the Windows 2000 concepts explained in this section In this example, veltecom is the root domain for a tree that contains two other child domains (marketingveltecom and researchveltecom) and two OUs (Sales and PR) This tree has a consistent schema that is contained within the AD Updates from the three domains are carried out via multimaster replication
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Figure 1-1: Domain architecture in Windows 2000 Tree A could be connected to another tree, provided that tree adopts the same schema Here, Tree B is connected at the two root domains by an explicit trust relationship between veltecom and microsoftcom Within each tree there are implicit trusts enabling users in children domains to use resources throughout the tree (provided they have permission); thus, users in one tree can use resources in another tree (again, if they are granted permission)
The Enterprise Under Windows 2000
As you can imagine, you'll have substantial flexibility in how you organize your enterprise under Windows 2000 The building blocks have been augmented Primary domain controllers (PDCs) and backup domain controllers (BDCs) are gone Instead, groups of domain controllers (DCs) are in charge of authenticating users and keeping track of resources All DCs are considered equivalent peers, and an update to your nearest DC will eventually propagate to the other DCs OUs are primarily used to separate authority over a subset of the domain, because you can create users for a particular OU For example, your domain might be nycompanycom, with OUs called Finance
and Marketing The Finance people get full control over their resources, as do the Marketing folks Interdomain trusts are no longer one-way Instead, transitive trusts are used Thus, if companycom has a child domain called uscompanycom, which has two child domains called causcompanycom and nyuscompanycom, then users of either lower domain can view objects throughout the entire collection of domains When more domains are added, the benefit of this trust arrangement becomes prominent: it can save a lot of time in administration, with fewer of the access problems common to trusting domains
Important New Features
In addition to the internetworking concepts described in the preceding sections, Windows 2000 offers a host of other new features to tempt you toward migration Let's take a look at new management features that focus on managing a Windows 2000 tree or forest, and at added tools for heightening network security
Windows 2000 promises to simplify management tasks while reducing management costs 9 examines some of the new tools available to administrators and shows you the configuration basics for your new Windows 2000 domain Some of the most exciting additions to the toolbox include the Microsoft Management Console (MMC) and IntelliMirror Microsoft Management Console By using a single framework for all its management applications, Microsoft expects to make system management easier and less costly This is the concept behind the Microsoft Management Console (MMC) The MMC is absolutely useless by itself When you load it (type mmc at a command prompt), the interface is empty and has no function (see Figure 1-2) Only when "snap-ins" are loaded into the MMC does it become a useful management tool
Figure 1-2: The MMC is only a framework for administrative tools A consistent framework for all management tools will reduce time spent learning how to use a variety of tools In addition, you can customize your own tools by loading more than one administrative feature into the MMC and then saving it as a specific console Later, you can call up just those tools by selecting that particular console For example, if you typically work with a specific set of utilities for, say, troubleshooting a server, you can build a console with those utilities Figure 1-3 shows an MMC loaded with five security management tools
Figure 1-3: The MMC with five security tools loaded IntelliMirror Microsoft's set of new technologies, called IntelliMirror, allow many of the system management functions to be automated We're not talking scripts here; this is something a bit more advanced With IntelliMirror, administrators can automatically distribute software, control users' policies, and install Windows remotely What's more, applications can be set up to detect corrupt files and then repair themselves by downloading the appropriate file from a central server For the most part, IntelliMirror's technologies focus on the tasks associated with providing data to users By spreading the data over many servers, users are ensured quick and reliable access, even in the event of a server failure Performance Enhancements One of the most common and valid complaints against Windows NT made by UNIX administrators is the frequency of administrative reboots This consumes the administrator's time, severs open connections, and temporarily denies access to resources No wonder this sort of maintenance must be carried out after hours (causing additional annoyance to the administrator, of course) During typical NT maintenance, the administrator must frequently reboot the system for new settings to take effect Reduced frequency of reboots is one of the promised performance enhancements with Windows 2000 While this is the case, there are still more required reboots with Windows 2000 than for a comparable UNIX system Nonetheless, NT administrators will be very pleased by this reduced frequency in which they must watch Windows boot up While this is a benefit, in our experience Windows 2000 takes a bit longer (especially the Domain Controllers) to boot up than NT Built-in load balancing is another enhancement that promises to give Windows 2000 a better running record Up to 32 servers running Advanced Server can be set up to evenly distribute incoming server requests These systems appear to be a single server to the end user If you need to take one of the servers down for maintenance, the others simply take over the downed server's load The end result is increased reliability and scalability
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