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java gs1 128

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A query is a specific request made by a user to the global catalog in order to retrieve, modify, or delete Active Directory data. The following steps, illustrated in Figure 1-9, describe the query process: 1. The client queries its DNS server for the location of the global catalog server. 2. The DNS server searches for the global catalog server location and returns the IP address of the domain controller designated as the global catalog server. 3. The client queries the IP address of the domain controller designated as the global catalog server. The query is sent to port 3268 on the domain controller; standard Active Directory queries are sent to port 389. 4. The global catalog server processes the query. If the global catalog contains the attribute of the object being searched for, the global catalog server provides a response to the client. If the global catalog does not contain the attribute of the object being searched for, the query is referred to Active Directory. You can configure any domain controller or designate additional domain controllers as global catalog servers. When considering which domain controllers to designate as glo bal catalog servers, base your decision on the ability of your network structure to han dle replication and query traffic.

The disk was originally installed on another computer and has not yet been set up for use on your computer. (This status message appears on dynamic disks only.) All or part of the disk may be physically damaged, or (in the case of a dynamic disk) the dynamic disk database may be corrupted.

1-19

To display the Books property s data, we ll use an interesting feature of ASP.NET data controls: they can be nested. In listing 4.21, we use this feature to display the books in a bulleted list.

Restart the computer. If the problem persists, right-click the disk and choose Rescan Disks. If the status is still unreadable, some data on the disk may be recoverable with third-party utilities. After you reconnect or power on the missing disk, right-click the disk and choose Reactivate Disk to return its status to Online.

As an administrator, you must place global catalog servers in sites to provide quick responses to user inquiries, as well as redundancy. See Lesson 3, Planning the Active Directory Infrastructure Design, to learn the basics of designing global catalog server placement. See 5, Configuring Sites and Managing Replication, for details about configuring global catalog servers.

The disk is corrupted, disconnected, or not powered on. (This status message appears on dynamic disks only.)

The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson and then try the ques tion again. Answers to the questions can be found in the Questions and Answers section at the end of this chapter. 1. How is a directory service different from a directory

18

Listing 4.21 Markup for the nested queries (Nested.aspx)

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Table 18-1.

1

The disk does not contain a valid signature. It may have been prepared on a system running a non-Microsoft operating system, such as UNIX or Linux, or the drive may be brand new. A disk is not inserted in the drive. (This status message appears only on removable media drives, such as Zip drives and CD-R/CD-RW drives.)

A directory service stores all the information needed to use and manage system objects in a centralized location, simplifying the process of locating and managing these resources. Data stored in Active Directory is organized into objects, which have attributes. The Active Directory schema defines objects that can be stored in Active Directory. Schema classes and attributes define the Active Directory schema. The logical structures in an organization are represented by the following Active Directory components: domains, OUs, trees, and forests. The physical components of Active Directory are sites and domain controllers. The global catalog is the central repository of information about objects in a tree or forest.

If the disk is used by another operating system, do nothing. To prepare a new disk for use with Windows XP right-click the disk , and choose Initialize Disk. Insert a disk in the drive and choose Action, Rescan Disks.