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DNS server A server that maintains informa-

The part of an object s security descriptor that grants or denies specific users and groups permission to access the object. Only the owner of an object can change permissions granted or denied in a DACL; thus, access to the object is at the owner s discretion. See also access control entry (ACE); object; security descriptor; security group; system access control list (SACL).

The Start menu looks and acts the same, as shown in Figure 11-9, but there is one minor difference: the Start menu displays your full name as stored in your domain user account instead of your user name.

DNS zone In a DNS database, a zone is a con-

tiguous portion of the DNS tree that is administered as a single separate entity by a DNS server. The zone contains resource records for all the names within the zone.

In Active Directory, a collection of computers defined by the administrator. These computers share a common directory database, security policies, and security relationships with other domains. In DNS, any tree or subtree within the DNS namespace. Although the names for DNS domains often correspond to Active Directory domains, DNS domains should not be confused with Active Directory domains. See also Active Directory; Domain Name System (DNS).

When you use Windows XP on a stand-alone computer or in a workgroup, the Task Manager appears when you press Ctrl+Alt+Delete. When you configure Windows XP Professional to log on to a Windows domain, the Windows Security dialog box appears instead. In this dialog box, you can choose Lock The Computer, Log Off, Change Password, or Task Manager. Choose Task Manager to use it as you would with Windows XP in a workgroup situation. This of course is not a major change, but it is one that can cause some confusion.

Domain Name System (DNS)

A hierarchical, distributed database that contains mappings of DNS domain names to various types of data, such as IP addresses. DNS enables the location of computers and services by userfriendly names, and it also enables the discovery of other information stored in the database. See also domain; IP address; Transmission Control Protocol/Internet Protocol (TCP/IP). tree structure that is used to index domain names. Domain trees are similar in purpose and concept to the directory trees used by computer filing systems for disk storage. For example, when numerous files are stored on disk, directories can be used to organize the files into logical collections. When a domain tree has one or more branches, each branch can organize domain names used in the namespace into logical collections. In Active Directory, a hierarchical structure of one or more domains, connected by transitive, bidirectional trusts, that forms a contiguous namespace. Multiple domain trees can belong to the same forest. See also Active Directory; domain; domain name; Domain Name System (DNS); forest.

domain controller In an Active Directory for-

In Windows XP, User Accounts in Control Panel is used to manage your local user accounts. When you configure Windows XP Professional to log on to a Windows domain, User Accounts still appears in Control Panel, but its interface changes, as shown in Figure 11-10 on the next page.