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.

  • H

    HDLC (High-level Data Link Control)

    HDLC (High-level Data Link Control) is a group of protocols or rules for transmitting data between network points (sometimes called nodes).

  • HDSL (High bit-rate Digital Subscriber Line)

    Also see our Fast guide to DSL. HDSL (High bit-rate Digital Subscriber Line), one of the earliest forms of DSL, is used for wideband digital transmission within a corporate site and between the telephone company and a customer.

  • HELLO packet

    In the Open Shortest Path First (OSPF) communications protocol - which enables network routers to share information with each other, a HELLO packet is a special packet (message) that is sent out periodically from a router to establish and confirm network adjacency relationships.

  • High-Speed Circuit-Switched Data (HSCSD)

    High-Speed Circuit-Switched Data (HSCSD) is circuit-switched wireless data transmission for mobile users at data rates up to 38.4 Kbps, four times faster than the standard data rates of the Global System for Mobile (GSM) communication standard in 1999. HSCSD is comparable to the speed of many computer modems that communicate with today's fixed telephone networks.

  • high-speed dialup

    High-speed dialup, sometimes advertised as broadband dialup, is an Internet service provider (ISP) feature that speeds up data transfer by using a special server, called an acceleration server, to act as a bridge between the user's dialup connection and a Web page.

  • High-Speed Serial Interface (HSSI)

    High-Speed Serial Interface (HSSI) is a short-distance communications interface that is commonly used to interconnect routing and switching devices on local area networks (LANs) with the higher-speed lines of a wide area network (WAN).

  • home address

    In the Mobile Internet Protocol (Mobile IP), a home address is the relatively permanent IP address given to a mobile node.

  • home agent

    In Mobile Internet Protocol (Mobile IP), a home agent is a router on a mobile node's home network that maintains information about the device's current location, as identified in its care-of address.

  • Home Location Register (HLR)

    The Home Location Register (HLR) is the main database of permanent subscriber information for a mobile network.

  • home network

    Using Mobile IP (Mobile Internet Protocol), the home network is where a mobile device has its permanent IP address.

  • Home Phoneline Networking Alliance (HPNA)

    The HPNA (Home Phoneline Networking Alliance) is an industry group that promotes standards for using existing phone lines and jacks to interconnect computers within a home.

  • home server

    A home server is a computer that functions as a server in a client-server home network.

  • HomeRF (home radio frequency)

    HomeRF (for home radio frequency) is a home networking standard developed by Proxim Inc.

  • hoot-n-holler

    In telecommunications, a hoot-n-holler is a dedicated "always on" connection used for two-way business-to-business voice communication.

  • host (in computing)

    A host (also known as "network host") is a computer or other device that communicates with other hosts on a network.

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