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

    Hot Standby Router Protocol (HSRP)

    Hot Standby Router Protocol (HSRP) is a routing protocol that allows host computers on the Internet to use multiple routers that act as a single virtual router, maintaining connectivity even if the first hop router fails, because other routers are on "hot standby" - ready to go.

  • How do I...choose a VPN for my small business?

    A virtual private network (VPN)is a way to use a public telecommunication infrastructure, such as the Internet,to provide remote offices or individual users with secure access to their organization's network.

  • htaccess

    .htaccess is the default name for a file that is used to indicate who can or cannot access the contents of a specific file directory from the Internet or an intranet.

  • HTTP/2 protocol

    HTTP/2 protocol is the second version of HTTP, a network protocol used to define the format and transmission of data.

  • hybrid fiber coaxial network (HFC network)

    A hybrid fiber coaxial (HFC) network is a telecommunication technology in which optical fiber cable and coaxial cable are used in different portions of a network to carry broadband content (such as video, data, and voice).

  • hybrid SDN

    A hybrid SDN (software-defined network) is a network where both traditional networking and SDN protocols operate in the same environment.

  • hybrid WAN

    A hybrid WAN is a wide area network that sends traffic over two or more connection types. Hybrid WANs permit dynamic traffic engineering across both private and public domains, using a variety of connectivity options to make the best use of network resources.

  • network hub

    A network hub is a node that broadcasts data to every computer or Ethernet-based device connected to it.

  • I

    i-Mode

    i-Mode is the packet-based service for mobile phones offered by Japan's leader in wireless technology, NTT DoCoMo.

  • ICMP (Internet Control Message Protocol)

    ICMP (Internet Control Message Protocol) is an error-reporting and message-control protocol that network devices use to report problems in IP packet delivery.

  • iDEN (Integrated Digital Enhanced Network)

    iDEN (Integrated Digital Enhanced Network) is a wireless technology from Motorola combining the capabilities of a digital cellular telephone, two-way radio, alphanumeric pager and data/fax modem in a single network.

  • IDSL

    IDSL is a system in which digital data is transmitted at 128 Kbps on a regular copper telephone line (twisted pair) from a user to a destination using digital (rather than analog or voice) transmission, bypassing the telephone company's central office equipment that handles analog signals.

  • in-band signaling

    In the public switched telephone network, (PSTN), in-band signaling is the exchange of signaling (call control) information on the same channel that the telephone call itself is using.

  • iNet

    An iNet (pronounced AI-neht) is any network that uses the Internet Protocol (IP).

  • information theory

    Information theory is a branch of mathematics that overlaps into communications engineering, biology, medical science, sociology, and psychology.

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