Digium Certified Asterisk Administrator by Asterisk

Digium Certified Asterisk Professional by Asterisk

A magazine that is delivered in digital (electronic form) on an electronic medium, such as a CD-ROM. A digizine can be stand-alone or used as a supplement to printed information or information on a Web site.

Dimensional modeling (DM) is the name of a set of techniques and concepts used in data warehouse design. It is considered to be different from entity-relationship modeling (ER).

A table in a star schema of a data warehouse. A dimension table stores attributes, or dimensions, that describe the objects in a fact table. In data warehousing, a dimension is a collection of reference information about a measurable event. 

The ability to obtain data from a storage device by going directly to where it is physically located on the device rather than by having to sequentially look for the data at one physical location after another. 

A network file system, similar to NFS and CIFS, that allows applications to transfer data while bypassing operating system control, buffering, and network protocol operations that can bottleneck throughput. 

A general term for magnetic disk storage devices. The term has historically been used in the mainframe and minicomputer (mid-range computer) environments and is sometimes used to refer to hard disk drives for personal computers. 

A communications specification that defines a format for attaching files (called payloads) to Simple Object Access Protocol (SOAP) messages between application programs over the Internet. 

A capability provided by some computer bus architectures that allows data to be sent directly from an attached device (such as a disk drive) to the memory on the computer's motherboard. 

A method of paying for merchandise by charging the purchase to a cellular telephone (mobile phone) account. At the time of checkout, the customer selects the mobile billing option on a smartphone and follows a two-factor authentication procedure.

An approach to spread spectrum modulation for digital signal transmission over the airwaves. The stream of information to be transmitted is divided into small pieces, each of which is allocated across to a frequency channel across the spectrum. 

Direct2D is a hardware-accelerated, immediate-mode, 2-D and vector graphics application programming interface (API) that provides high performance and high-quality rendering for 2-D geometry, bitmaps, and text. It is designed by Microsoft and implemented in Windows 8, Windows 7 and Windows Server 2008 R2, and also Windows Vista and Windows Server 2008.

Direct3D is a graphics application programming interface (API) for Microsoft Windows and is part of Windows operating system. Direct3D is used to render three-dimensional graphics in applications where performance is important, such as games.

Microsoft DirectComposition is a Windows component that enables high-performance bitmap composition with transforms, effects, and animations. Application developers can use the DirectComposition API to create visually engaging user interfaces that feature rich and fluid animated transitions from one visual to another.

An attempt to determine the valid e-mail addresses associated with an e-mail server in order to harvest and add them to a spam database. A DHA can use either of two methods - brute force approach and sending a message to the most likely usernames.