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In a workgroup environment, each computer running Windows XP Professional is responsible for maintaining its own security database. Local user accounts are used to log on to the computer and to control access to resources on the computer. Security and administration in a workgroup are distributed. You must create local user accounts on each computer, and although you can often manage a computer remotely, you must manage each computer separately. The larger the network you are working with, the more overhead this distributed management creates. Active Directory simplifies the security and administration of resources throughout a network (including the computers that are part of the network) by providing a single point of administration for all objects on the network. Active Directory organizes resources hierarchically in domains, which are logical groupings of servers and other network resources. Each domain includes one or more domain controllers. A domain controller is a computer running Windows 2000 Server or Windows Server 2003 on which Active Directory is installed. The domain controller stores a complete replica of the domain directory. To simplify administration, all domain controllers in the domain are peers. You can make changes to any domain controller, and the updates are replicated to all other domain controllers in the domain.

A personal computer with a 550 megahertz (MHz) or higher Pentium III compatible CPU. 256 megabytes (MB) of memory. One network adapter for communication with the internal network. An additional network adapter for each network directly connected to the ISA Server 2004 computer. If you are using the ISA Server computer as a proxy and caching-only server, you do not need an additional network adapter.

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2-15

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One big advantage that Active Directory provides is a single logon point for all network resources, so a user can log on to the network with a single user name and password, and then access any resources to which the user account is granted access. An administrator can log on to one computer and administer objects on any computer in the network. Windows XP Professional provides a wide range of security settings that you can enforce (you will learn all about them in 16, Configuring Security Settings and Internet Options ). You can enforce these settings locally by configuring them on each computer (and that is the way you have to do it in a workgroup environment). In an Active Directory environment, you can use a feature named Group Policy to enforce settings on all computers on the network. This allows the network administrator to make changes faster and improve network functionality without requiring user intervention to invoke changes.

To learn more about how Active Directory provides single logon for network users, view the multimedia presentation How Active Directory Enables a Single Sign-On, which is included in the Multimedia folder on the CD accompanying this book.

One local hard disk partition that is formatted with the NTFS file system and that has at least 150 megabytes (MB) of available hard disk space. If you enable caching and logging, you will need additional hard disk space.

What makes Active Directory so configurable and so scalable is that it separates the logical structure of the administrative hierarchy which is made up of domains, trees, forests, organizational units (OUs), and objects from the physical structure of the network itself. The logical structure of Active Directory does not rely on the physical location of servers or the network connectivity throughout the domain. This abstraction of the logical structure from the physical structure provides the powerful ability to structure domains according to your administrative and organizational needs. Because Active Directory separates the logical structure of network resources from the physical structure of the network itself, it is useful to break the discussion of Active Directory along those same lines. The logical components of the Active Directory structure include the following (see Figure 14-1):

Exported datasets are often a view of the actual data. Problems can occur because source data and the need for derived data are not properly understood. Often the solution is to look for errors in interpretation possibly an outer join was used instead of an inner join, or vice versa, or NULL values were not handled correctly.

As you can see from the previous list, ISA Server does not require a high-powered server in most environments. If you are deploying ISA Server in a small to medium-sized organization, you can probably reuse older hardware that has been replaced. Just ensure that you have all the appropriate Windows drivers if you are using older hardware.

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ISA Server 2004, Enterprise Edition, must be installed on a computer that is running Windows Server 2003. In addition to the hardware requirements listed above, you will need the following minimum disk space requirements for the ISA Server components:

14

Figure 14-1

ISA Server Services 106 MB Configuration Storage server 58 MB ISA Server Services and Configuration Storage server 156 MB ISA Server management 32 MB

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