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Ταξινομημένα προς το παρόν Όνομα (αύξουσα) Ταξινόμηση κατά: Επώνυμο | Όνομα

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datagram Logical grouping of information sent as a network layer unit over a transmission medium without prior establishment of a virtual circuit. IP datagrams are the primary information units in the Internet. The terms frame, message, packet, and segment are also used to describe logical information groupings at various layers of the OSI reference model and in various technology circles.

DCE Data communications equipment (EIA expansion) or data circuit-terminating equipment (ITU-T expansion). The devices and connections of a communications network that comprise the network end of the user-to-network interface. The DCE provides a physical connection to the network, forwards traffic, and provides a clocking signal used to synchronize data transmission between DCE and DTE devices. Modems and interface cards are examples of DCE.

decryption The reverse application of an encryption algorithm to encrypted data, thereby restoring that data to its original, unencrypted state.

default route Routing table entry that is used to direct frames for which a next hop is not explicitly listed in the routing table.

Λέξεις κλειδιά: gatewayrouting

delay The time between the initiation of a transaction by a sender and the first response received by the sender. Also, the time required to move a packet from source to destination over a given path.

demodulation Process of returning a modulated signal to its original form. Modems perform demodulation by taking an analog signal and returning it to its original (digital) form.

Λέξεις κλειδιά: modem

demultiplexing The separating of multiple input streams that have been multiplexed into a common physical signal back into multiple output streams.

Λέξεις κλειδιά: multiplexing

DES Data Encryption Standard. Standard cryptographic algorithm developed by the U.S. NBS.

Λέξεις κλειδιά: encryption

destination address Address of a network device that is receiving data.

destination port Number of the called port.

dial-up line Communications circuit that is established by a switched-circuit connection using the telephone company network.

Λέξεις κλειδιά: pstnmodem

digital signal Language of computers comprising only two states, on and off which are indicated by a series of voltage pulses.

DNS Domain Naming System. System used in the Internet for translating names of network nodes into addresses.

Λέξεις κλειδιά: domain

domain In the Internet, a portion of the naming hierarchy tree that refers to general groupings of networks based on organization-type or geography.

Λέξεις κλειδιά: resolve

DSR Data set ready. EIA/TIA-232 interface circuit that is activated when DCE is powered up and ready for use.

DSU Data service unit. Device used in digital transmission that adapts the physical interface on a DTE device to a transmission facility such as T1 or E1. The DSU is also responsible for such functions as signal timing. Often referred to together with CSU, as CSU/DSU.

DTE Data terminal equipment. Device at the user end of a user-network interface that serves as a data source, destination, or both. DTE connects to a data network through a DCE device (for example, a modem) and typically uses clocking signals generated by the DCE. DTE includes such devices as computers, protocol translators, and multiplexers.

DTFM Dual tone multifrequency. Use of two simultaneous voice-band tones for dialing (such as touch tone).

DTR Data terminal ready. EIA/TIA-232 circuit that is activated to let the DCE know when the DTE is ready to send and receive data.

dual homing Network topology in which a device is connected to the network by way of two independent access points (points of attachment). One access point is the primary connection, and the other is a standby connection that is activated in the event of a failure of the primary connection.

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