Networking Definitions

  • D

    dynamic port numbers (private port numbers)

    The dynamic port numbers (also known as the private port numbers) are the port numbers that are available for use by any application to use in communicating with any other application, using the Internet's Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP).

  • Dynamic Source Routing (DSR)

    Dynamic Source Routing (DSR) is a self-maintaining routing protocol for wireless networks. The protocol can also function with cellular telephone systems and mobile networks with up to about 200 nodes. A Dynamic Source Routing network can configure and organize itself independently of oversight by human administrators.

  • E

    E-carrier system

    To see the relationship between the E-carrier system, the T-carrier system, and DS0 multiples, see digital signal X. E1 (or E- is a European digital transmission format devised by the ITU-TS and given the name by the Conference of European Postal and Telecommunication Administration (CEPT).

  • E-ZPass

    E-ZPass is a toll collection system in the northeastern U.S. that uses RFID technology to allow a driver to pass through a tollbooth and pay the toll without stopping the vehicle.

  • E.164

    E.164 is an international numbering plan for public telephone systems in which each assigned number contains a country code (CC), a national destination code (NDC), and a subscriber number (SN).

  • ECC (error correction code or error checking and correcting)

    ECC (either "error correction [or correcting] code" or "error checking and correcting") allows data that is being read or transmitted to be checked for errors and, when necessary, corrected on the fly.

  • edge device

    An edge device is a physical device that can pass packets between a legacy network, such as an Ethernet network, and an ATM network, using Data Link layer and Network layer information.

  • egress

    Egress (pronounced EE-grehs, from Latin egressus, or going out) is the act of going out of something.

  • egress filtering

    Egress filtering is a process in which outbound data is monitored or restricted, usually by means of a firewall that blocks packets that fail to meet certain security requirements.

  • EIGRP (Enhanced Interior Gateway Routing Protocol)

    EIGRP (Enhanced Interior Gateway Routing Protocol) is a network protocol that lets routers exchange information more efficiently than with earlier network protocols.

  • electronic program guide (EPG)

    An electronic program guide (EPG) is an application used with digital set-top boxes and newer television sets to list current and scheduled programs that are or will be available on each channel and a short summary or commentary for each program.

  • ELF (extremely low frequency)

    ELF (extremely low frequency) refers to an electromagnetic field having a frequency much lower than the frequencies of signals typically used in communications.

  • email response management service (ERMS)

    An email response management service (ERMS) is a set of programs that automatically handles email messages and attachments according to user-defined rules... (Continued)

  • encapsulation

    In general, encapsulation is the inclusion of one thing within another thing so that the included thing is not apparent.

  • encoder

    In digital audio technology, an encoder is a program that converts an audio WAV file into an MP3 file, a highly-compressed sound file that preserves the quality of a CD recording.

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