Networking Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing networking and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

  • D

    DHCP (Dynamic Host Configuration Protocol)

    DHCP (Dynamic Host Configuration Protocol) is a network management protocol used to dynamically assign an Internet Protocol (IP) address to any device, or node, on a network so they can communicate using IP.

  • dial-up

    Dial-up pertains to a telephone connection in a system of many lines shared by many users.

  • Dialed Number Identification Service (DNIS)

    DNIS (Dialed Number Identification Service) is a telephone service that identifies for the receiver of a call the number that the caller dialed.

  • digital loop carrier (DLC)

    DLC also is an abbreviation for Data Link Control.

  • Digital Powerline (DPL)

    Digital Powerline (DPL) technology provides the transmission of data to users over the same lines that bring electric power to homes and businesses.

  • digital switch

    A digital switch is a device that handles digital signals generated at or passed through a telephone company central office and forwards them across the company's backbone network.

  • Direct Access File System (DAFS)

    Direct Access File System (DAFS) is a network file system, similar to Network File System (NFS) and Common Internet File System (CIFS), that allows applications to transfer data while bypassing operating system control, buffering, and network protocol operations that can bottleneck throughput.

  • Direct Outward Dialing (DOD)

    Direct Outward Dialing (DOD) is a service of a local phone company (or local exchange carrier) that allows subscribers within a company's private branch exchange (PBX) system to connect to outside lines directly.

  • direct sequence spread spectrum (DSSS) or direct sequence code division multiple access (DS-CDMA)

    Direct sequence spread spectrum, also known as direct sequence code division multiple access (DS-CDMA), is one of two approaches to spread spectrum modulation for digital signal transmission over the airwaves.

  • discrete multitone (DMT)

    Discrete multitone (DMT) is a method of separating a Digital Subscriber Line (DSL) signal so that the usable frequency range is separated into 256 frequency bands (or channels) of 4.3125 KHz each.

  • disruption-tolerant network (DTN)

    A disruption-tolerant network (DTN) is a network designed so that temporary or intermittent communications problems, limitations and anomalies have the least possible adverse impact... (Continued)

  • Distributed Control Plane Architecture (DCPA)

    A Distributed Control Plane Architecture (DCPA) is a network architecture that makes it possible to allocate control protocol functions across multiple processor levels in the network system.

  • distributed virtual switch

    A distributed virtual switch is an abstract representation of multiple hosts defining the same name, network policy and port group.

  • distributive numerical control (DNC)

    Distributive numerical control (DNC) is a technology that allows a single computer to be networked with one or more machines that use computer numerical control (CNC).

  • DOCSIS (Data Over Cable Service Interface Specifications)

    Now known as CableLabs Certified Cable Modems, DOCSIS (Data Over Cable Service Interface Specifications) is a standard interface for cable modems, the devices that handle incoming and outgoing data signals between a cable TV operator and a personal or business computer or television set.

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