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

    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.

  • domain name system (DNS)

    The domain name system (DNS) maps internet domain names to the internet protocol network addresses they represent and allows websites to use names, rather than difficult-to-remember IP addresses.

  • DoPa (DoCoMo Packet Transmission)

    DoPa (DoCoMo Packet Transmission) is a packet-switched network service developed by NTT DoCoMo in Japan for Internet connection from mobile devices.

  • downloading

    Downloading is the transmission of a file from one computer system to another, usually smaller computer system.

  • downstream

    This term should not be confused with downlink.

  • DTE (Data Terminal Equipment)

    In computer data transmission, DTE (Data Terminal Equipment) is the RS-232C interface that a computer uses to exchange data with a modem or other serial device.

  • DTMF (dual tone multi frequency)

    DTMF (dual tone multi frequency) is the signal to the phone company that you generate when you press an ordinary telephone's touch keys.

  • DTTV (digital terrestrial television)

    DTTV (digital terrestrial television, sometimes also abbreviated DTT) is digital television (DTV) broadcast entirely over earthbound circuits.

  • dumb network

    A dumb network is one that provides the physical interconnection between nodes but not much processing to support signaling.

  • duplex

    In telecommunication, duplex communication means that both ends of the communication can send and receive signals at the same time.

  • DVMRP (Distance Vector Multicast Routing Protocol)

    DVMRP (Distance Vector Multicast Routing Protocol) is the oldest routing protocol that has been used to support multicast data transmission over networks.

  • dynamic and static

    In general, dynamic means energetic, capable of action and/or change, or forceful, while static means stationary or fixed.

  • Dynamic ARP Inspection (DAI)

    Dynamic ARP Inspection (DAI) is a security feature that verifies address resolution protocol (ARP) requests and responses in a network.

  • dynamic packet filter

    A dynamic packet filter is a firewall facility that can monitor the state of active connections and use this information to determine which network packets to allow through the firewall.

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