Network Administration Definitions

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    6to4

    6to4 is a tunneling mechanism used to transfer IPv6 (Internet Protocol version 6) packets over an IPv4 infrastructure, typically the IPv4 Internet. The 6to4 mechanism was created to support coexistence of both versions during the transition to IPv6, which is expected to take years. (Continued)

  • A

    AARP (AppleTalk Address Resolution Protocol)

    AARP (AppleTalk Address Resolution Protocol) is a way to map between the physical hardware addresses of computers, such as those known to an Ethernet or token ring local area network, and their temporarily assigned AppleTalk network addresses.

  • acoustic coupler

    An acoustic coupler is a hardware device that enables a modem (a device that converts signals from analog to digital and from digital back to analog) to connect to a voice circuit.

  • active network

    An active network is a network in which the nodes are programmed to perform custom operations on the messages that pass through the node.

  • address

    An address can mean the unique location of either ( an Internet server, (2) a specific file (for example, a Web page), or (3) an e-mail user. It is also used to specify the location of data within computer storage.

  • ADSL (Asymmetric Digital Subscriber Line)

    Also see Fast Guide to DSL. ADSL (Asymmetric Digital Subscriber Line) is a technology for transmitting digital information at a high bandwidth on existing phone lines to homes and businesses.

  • aggregator

    Like its synonym concentrator, an aggregator is any device that serves multiple other devices or users either with its own capabilities or by forwarding transmissions in a more concentrated and economical way.

  • Aloha (Aloha method)

    Aloha, also called the Aloha method, refers toa simple communications scheme in which each source (transmitter) in a network sends data wheneverthere is a frame to send.

  • AMTOR (amateur teleprinting over radio)

    AMTOR (amateur teleprinting over radio) is a digital communications method used by radio amateurs, in which the frequency of errors is reduced by handshaking or character repetition.

  • anycast

    In Internet Protocol Version 6 (IPv6), anycast is communication between a single sender and the nearest of several receivers in a group. The term exists in contradistinction to multicast, communication between a single sender and multiple receivers, and unicast, communication between a single sender and a single receiver in a network.

  • AppleTalk

    AppleTalk is a set of local area network communication protocols originally created for Apple computers.

  • ARPA (Advanced Research Projects Agency)

    An agency of the United States Department of Defense, ARPA (Advanced Research Projects Agency) underwrote development for the precursor of the Internet, known as ARPANET. Initially a modest network of four interconnected university computers, ARPANET's initial purpose was to enable mainly scientific users at the connected institutions to communicate and share resources.

  • ARPANET

    ARPANET was the network that became the basis for the Internet. Based on a concept first published in 1967, ARPANET was developed under the direction of the U.S. Advanced Research Projects Agency (ARPA). In 1969, the idea became a modest reality with the interconnection of four university computers.

  • asynchronous

    In general, asynchronous (pronounced "ay-SIHN-kro-nuhs," from Greek "asyn," meaning "not with," and "chronos," meaning "time") is an adjective describing objects or events that are not coordinated in time.

  • ATM (asynchronous transfer mode)

    ATM (asynchronous transfer mode) is a dedicated-connection switching technology that organizes digital data into 53-byte cell units and transmits them over a physical medium using digital signal technology.

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