Networking Definitions

  • 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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