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cyclic redundancy check (CRC) A highly accurate error-detection method based on interpreting a pattern of bits as a polynomial
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data element The smallest entity that can represent a piece of information A bit data encryption standard (DES) The US government standard encryption method for
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nonmilitary and nonclassified use
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data link connection identifier (DLCI) A number that identifies the virtual circuit in
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data link control The responsibilities of the data link layer: flow control and error control data link layer The second layer in the Internet model It is responsible for node-to-node delivery Data Over Cable System Interface Specifications (DOCSIS)
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transmission over an HFC network A standard for data
data rate The number of data elements sent in one second data transfer phase The intermediate phase in circuit-switched or virtual-circuit network in
which data transfer takes place
data transparency The ability to send any bit pattern as data without it being mistaken for
datagram In packet switching, an independent data unit datagram network A packet-switched network in which packets are independent from each
dataword The smallest block of data in block coding de facto standard
A protocol that has not been approved by an organized body but adopted as a standard through widespread use
de jure standard A protocol that has been legislated by an officially recognized body deadlock A situation in which a task cannot proceed because it is waiting for an even that will
A measure of the relative strength of two signal points
decryption Recovery of the original message from the encrypted data default mask The mask for a network that is not subnetted default routing A routing method in which a router is assigned to receive all packets with no match in the routing table Defense Advanced Research Projects Agency (DARPA) A government organization,
which, under the name of ARPA funded ARPANET and the Internet
delta modulation An analog-to-digital conversion technique in which the value of the digital
signal is based on the difference between the current and the previous sample values
demodulation The process of separating the carrier signal from the information-bearing signal demultiplexer (DEMUX) A device that separates a multiplexed signal into its original
denial of service attack A form of attack in which the site is flooded with so many phony
requests that is eventually forced to deny service
dense wave-division multiplexing (DWDM)
A WDM method that can multiplex a very large number of channels by spacing channels closer together
differential Manchester encoding A digital-to-digital polar encoding method that features a
transition at the middle of the bit interval as well as an inversion at the beginning of each 1 bit
Differentiated Services (DS or Diffserv) A class-based QoS model designed for IF Diffie-Hellman protocol A key management protocol that provides a one-time session key
for two parties
digest A condensed version of a document digital AMPS (D-AMPS) A second-generation cellular phone system that is a digital version
digital data digital signal
Data represented by discrete values or conditions A digital version of an analog leased line with a rate of 64 Kbps A telephone company service featuring a hierarchy of digital A discrete signal with a limited number of values
digital data service (DDS) digital signal (DS) service signals digital signature
A method to authenticate the sender of a message
digital subscriber line (DSL) A technology using existing telecommunication networks to accomplish high-speed delivery of data, voice, video, and multimedia digital subscriber line access multiplexer (DSLAM) that functions like an ADSL modem digital-to-analog conversion digital-to-digital conversion digitization Dijkstra's algorithm routers direct current (DC) A telephone company site device
The representation of digital information by an analog signal The representation of digital information by a digital signal
Conversion of analog information to digital information In link state routing, an algorithm that finds the shortest path to other A zero-frequency signal with a constant amplitude
direct delivery A delivery in which the final destination of the packet is a host connected to c the same physical network as the sender direct sequence spread spectrum (DSSS) A wireless transmission method in which each bit to be sent by the sender is replaced by a sequence of bits called a chip code discard eligibility (DE) congestion in the network A bit that identifies a packet that can be discarded if there is
discrete cosine transform (DCT) A JPEG phase in which a transformation changes the 64 values so that the relative relationships between pixels are kept but the redundancies are revealed discrete multitone technique (DMT) andFDM A modulation method combining elements of QAM
Distance Vector Multicast Routing Protocol (DVMRP) A protocol based on distance vector routing that handles multicast routing in conjunction with IGMP distance vector routing A routing method in which each router sends its neighbors a list of networks it can reach and the distance to that network distortion Any change in a signal due to noise, attenuation, or other influences distributed coordination function (DCF) The basic access method in wireless LANs; stations contend with each other to get access to the channel distributed database Information stored in many locations