D

DAV

See Distributed Authoring and Versioning (DAV).

Deployment Tools

A set of documentation that guides you through the Exchange Server 2003 installation process and provides checklists to help you ensure successful installation.

digest authentication

A form of authentication in Microsoft Internet Information Services (IIS) in which the password is sent as a hashed value that works through proxies and firewalls. This method works with all HTTP 1.1–compliant browsers, but the password is unencrypted in the Microsoft Windows 2003 domain controller.

dismount

See mount.

distinguished name

A name assigned to every object in Active Directory that identifies where the object resides in the overall object hierarchy.

Distributed Authoring and Versioning (DAV)

An extension to HTTP 1.1 that allows for the manipulation (reading and writing) of objects and attributes on a Web server. Also known as WebDAV. Exchange natively supports WebDAV. Although not specifically designed for the purpose, DAV allows for the control of data using a filing system–like protocol. DAV commands include PROPFIND and PROPPATCH.

DNS

See Domain Name System (DNS).

domain

The core unit in Active Directory. A domain is made up of a collection of computers that share a common directory database.

domain controller

A server running Windows 2000 Server or Windows Server 2003 that has Active Directory installed. Each domain controller is able to authenticate users for its own domain. It holds a complete replica of the domain naming partition for the domain to which it belongs and a complete replica of the configuration and schema naming partitions for the forest.

Domain Name System (DNS)

A widely used standards-based protocol that allows clients and servers to resolve names into IP addresses and vice versa. Windows Server 2003 extends this concept even further by supplying a dynamic DNS (DDNS) service that enables clients and servers to automatically register themselves in the database without needing administrators to manually define records.

domain naming partition

A partition of Active Directory that stores all domain objects for Exchange Server 2003 and replicates the objects to every domain controller in the domain. Recipient objects, including users, contacts, and groups, are stored in this partition. See also configuration naming partition and schema naming partition.

domain tree

A collection of domains that have a contiguous namespace, such as microsoft.com, dog.microsoft.com, and cat.microsoft.com. Domains within the forest that do not have the same hierarchical domain name are located in a different domain tree. When different domain trees exist in a forest, the domain tree is referred to as a disjointed namespace.

DSAccess

The Exchange component that provides directory lookup services for components such as SMTP and MTA. Client requests use the DSProxy service for directory access.

DSProxy

The Exchange component that can proxy (and refer) MAPI directory service requests from Microsoft Outlook clients to Active Directory for address book lookup and name resolution.