数字数据网络（Digital Data Network DDN）是一个传输速率高、质量好、网络时延小和全透明的数字数据网络。
数字数据网络（Digital Data Network DDN）是一个传输速率高、质量好、网络时延小和全透明的数字数据网络。
相关考题：
在通信专业中，DSP的英文全称是（91），“自适应的“通常翻译为英文是（92）。A.Data Signal PulseB.Digital Signal ProcessingC.Data Stream PropertyD.Digital Spectrum Programming
All traffic, be it e-mail or streaming video, travels via a method called packet switching, (97)parcels out digital data into small chunks, or packets, and sends them over a network shared bycountless users.A.soB.whichC.andD.who
数字摄影(DR)表示的英文单词是()。A.data recognizerB.dynamic rangeC.digital radiographyD.data readerE.degree of radiation
网络接入方法有哪几种()? A.拨号接入B.综合业务数字网(ISDN)C.数字用户线路(xDSL)D.数字数据网络(DDN)E.混合光纤电缆(HFC)F.光纤到用户(FTTC)G.GSM/GPRS接入H.CDMA接入
Rapid advances in computer and communication technologies have resulted in the(71) merger of these two fields. The lines have bluned among computing, switching, and digital transmission equipment, and the same digital techniques are being used for data, voice, and image transmission. Merging and evolving technologies, coupled with increasing demands for efficient and timely collection, processing, and(72) of information, are leading to the development of(73) that transmit and process all types of data. The ultimate goal of this evolution is something its proponents-some of the most powerful forces in the computing and telecommunications industries-call the (74) .The (74) will be a worldwide public telecommunications network that will deliver a wide variety of services. The (74) will be defined by the standardization of user interfaces, and will be implemented as a set of digital switches and paths supporting a broad range of traffic types and providing (75) processing services. Inpractice, there will be multiple networks, implemented within national boundaries, but from the user's point of view there will be a single, uniformly accessible worldwide network.A．decreasingB．increasingC．collectiveD．single
Digital computer is controlled by internally stored programs and(66) of using common storage for all or part of a program and also for all or part of the data necessary for the execution of the programs; executing user-written or user-designated programs; performing user-designated manipulation of digitally represented discrete data, including.(67) operations and logic operations; and executing programs that(68) themselves during their execution.Analog computer's operations are analogous to the(69) of another system and that accepts, processes, and produces analog data.(70) computer integrates analog computer components and digital computer components by interconnection of digital-to-analog converters and analog-to-digital converters.A．qualifiedB．competentC．capableD．able
The(66)is a channel's capacity which directly reflects the data transfer rate of the channel.(67)functions in a NetWare network which is used to define addressing schemes.The(68)is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.(69)is the popular LAN developed under the direction of the IEEE802.3.The(70 is a device which enables digital microcomputers to communicate across analog telephone lines.A．volumeB．bandwidthC．noiseD．delay
Digital data can also be represented by (71)signals by use ofa modem. The modem converts a series of binary voltage (72) into an analog signal by encoding the digital data ontoa carrier frequency. The resulting signal occupies a certam spectrum of (73) centered about the carTier and may be propagated acrossa medium suitable for that carrier. The most common modems represent digital data in the voice(74)and hence allow those datato be propagated over ordinary voice-grade (75 )lines At the other end of the line, another modem demodulates the signal to recover the original data(71)A.analogB.digitalC.ModemD.electric
You are the Cisco Network Designer in Cisco.com. Which of these is a Layer 2 transport architecture that provides packet－based transmission optimized for data based on a dual ring topology?() A. DynamicTrunking ProtocolB. Resilient Packet RingC. Synchronous Digital HierarchyD. Coarse Wave Division Multiplexing
ISDN（Integrated Service Digital Network）中文名称是综合业务数字网，通俗称为“一线通”，它采用数字传输和数字交换技术，将电话、传真、数据、图像等多种业务综合在一个统一的数字网络中进行传输和处理。
数字摄影（DR）是哪两个英文单词的缩写（）A、data recognizerB、dynamic rangeC、digital radiographyD、data readerE、degree of radiation
You are the Cisco Network Designer in Cisco.com. Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual ring topology?（）A、DynamicTrunking ProtocolB、Resilient Packet RingC、Synchronous Digital HierarchyD、Coarse Wave Division Multiplexing
Which two statements are true about the digital audio in a VoIP network？ （）A、 Standard encoding techniques create an uncompressed digital data rate of 4000 bps.B、 Standard encoding techniques create an uncompressed digital data rate of 8000 bps.C、 Standard encoding techniques create an uncompressed digital data rate of 64，000 bps.D、 Voice quality is not a concern if compression is not used.E、 Two methods of quantization are linear and logarithmic.F、 Two methods of compression are u-law and a-law.
Which benefit does digital subscriber line (DSL) systems for broadband access provide to the user?（）A、Secure access to company extranetB、Dedicated lines for high security data transferC、Simple solution for high-quality digital video using coaxial cableD、Data and audio signals that share the same communications infrastructure
Which test checks the transmitter and receiver of a local modem？（）A、data parityB、analog loop backC、local digital loop backD、remote digital loop back
多选题Which two statements are true about the digital audio in a VoIP network？ （）AStandard encoding techniques create an uncompressed digital data rate of 4000 bps.BStandard encoding techniques create an uncompressed digital data rate of 8000 bps.CStandard encoding techniques create an uncompressed digital data rate of 64，000 bps.DVoice quality is not a concern if compression is not used.ETwo methods of quantization are linear and logarithmic.FTwo methods of compression are u-law and a-law.
单选题You are the Cisco Network Designer in Cisco.com. Which of these is a Layer 2 transport architecture that provides packet-based transmission optimized for data based on a dual ringtopology？（）A Dynamic Trunking ProtocolB Resilient Packet RingC Synchronous Digital HierarchyD Coarse Wave Division Multiplexing
判断题DDN（Digital data network）就是数字数据网，是利用数字信道来传输数据信号的数字数据网。A对B错