() switching was invented in the late 1960s for data communications.A．Frame B．Link C．Packet D．Line
() switching was invented in the late 1960s for data communications.
A．Frame B．Link C．Packet D．Line
相关考题：
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
In most wide area networks, the communication subnet consists of two distinct components：transmission lines andA．networtsB．switching elementsC．computersD．data terminal equipment
In the open systems interconnection (OSI) reference model, "layer" means one of seven conceptually complete,(71) arranged groups of services, functions, and protocols, that extend across all open systems.Application layer provides means for the application(72) to access the OSI environment. Presentation layer provides for the selection of a common syntax for representing data.(73) layer provides the means necessary for cooperating presentation entities to organize and synchronize their dialog and to manage their data exchange. Transport layer provides a reliable end-to-end data transfer service. Network layer provides for the entities in the transport layer the means for transferring blocks of data, by(74) and switching through the network between the open systems in which those entities reside. Data link layer provides services to transfer data between network layer entities. Physical layer provides the mechanical, electrical, functional, and procedural means to establish, maintain and(75) physical connections for transfer of bits over a transmission medium.A．ranklyB．levellyC．layeredD．hierarchically
In data communication, data link is those parts of two data terminal equipments that are controlled by a protocol along with the(71) data circuit, which together enable data(72). So-called protocol means, in short, a set of rules that determines the behavior. of functional units in achieving communication.Data circuit, however, consists of a pair of(73) transmission channels that provides a means of two-way data transmission. Between data switching exchanges, the data circuit may or may not include data circuit-terminating equipment (DCE), depending on the type of(74) used at the data switching exchange. Between a data station and a data switching exchange or data concentrator, the data circuit includes the DCE at the data station end, and may include equipment(75) to a DCE at the data switching exchange or dam concentrator location.A．handshakingB．interconnectingC．linkageD．joining
How does late arriving data affect dimensions and facts? Share techniques for handling each.迟到的数据对事实表和维度表有什么影响？怎样来处理这个问题？
ATM when referring to computers is a dedicated, connection switching technology that organizes digital data into 53-byte(69)units and transmits them over a physical(70)using digital signal technology. ATM is capable oftransniitfing at speeds of 155 or 622 MBit/s and faster.A．minutenessB．toothfulC．cellD．spot
Asynchronous Transfer Mode(ATM)is a(16)that promises to change the fabric of local and wide area communications.The key advantage of ATM is the capability to move voice, data, graphics and(17)at speeds of up to 2 gigabits per second.An ATM switch allows you to create a(18)network that is completely independent from the(19)configuration of the network.ATM uses a(20)called cell switching to convert data into fixed length cells of 53 bytes each, so they can be switched very quickly and efficiently.A．technologyB．video imagesC．logicalD．physical
Theabilitytostoreknowledgemakescomputersdifferentformeveryothermachine_______invented.A)everB)thusC)yetD)as
Which of the following WAN protocols is a packet switching technology?() A.Frame RelayB.POTSC.PSTND.ISDN
一条router－LSA可以描述多条连接,每条连接由Link ID,Data,Type和Metirc描述,下面关于Link ID,Data,Type和Metric的讨论错误的是() A.Type表示连接的类型B.Link ID表示此连接的本地标识，不同的链接类型Link ID表示的意义也不相同C.Data用于描述此连接的附加信息，不同的连接类型所描述的信息也不同D.Metric描述此连接的开销
Circuit Switching is problematic because data communications is（），that is， it is typically dominated by short bursts of activity with long periods of（）.A．reliable B．bursty C．digital D．continuous A．latency B．transmission C．delay D．inactivity
Why did the professor study the Brazilian students' behavior?A. He felt puzzled at the students' being late.B. He felt angry at the students' rudeness.C. He wanted to make the students come on time later.D. He wanted to collect data for one of his studies.
ATM（Asynchronous Transfer Mode）technology combines connection oriented mechanism and （ ） mechanism.ATM（异步传输模式）技术结合了面向连接机制和（ ）分组交换机制。A.circuit switching电路转接B.packet switching分组交换C.message switching信息转换D.voice switching声音转换
According to the passage, which aspect of skyscrapers was some residents of Boston con-cerned with in the late 1960s?__________A.The poor reception of radio and TV signalsB.The removal of trees and grass from building sitesC.The harmful effects on the city's plantsD.The obstruction of air traffic
You want your Catalyst switch to implement a switching method that holds a packet in its memory until the data portion of the respected packet reaches the switch.Which method should you employ on your Catalyst switch?（）A、Fast ForwardB、Store and forwardC、Frag-freeD、None of the above
1850 TSS-320数据业务的传送方式有（）A、数据到数据的交换（Pure Data Switching）B、SDH承载数据（Data over SDH）C、波分承载数据（Data ove rWDM）
In Cisco Nexus 1000V deployments which two statements are true?（）A、Vmware provides the VNIC and driversB、Vmware provides the VNIC and Cisco provides the driversC、Cisco provides the switching and management of switchingD、Cisco provides the switching and Vmware provides the management of switching
In which three network technologies is traffic shaping used to prevent and manage congestion？ （）A、Asynchronous Transfer Mode （ATM）B、data-link switching （DLSw）C、Route Processor Redundancy （RPR）D、Frame Relay （FR）E、Metro EthernetF、Multiprotocol Label Switching （MPLS）
For best packet switching performance with crypto, what is the recommend packet switching path in a Cisco Teleworker Router?（）A、Process SwitchingB、Silicon Switching C、Cisco Express Forwarding (CEF) SwitchingD、Autonomous Switching
单选题Ten o’clock is a very late hour for a boy of his age to stay up.Atoo late an hourBa too late hour Cvery much late an hourDa so late hour
单选题Although Allen popularized the use of angst- ridden monologue in film, the device was not invented by him.Athe device was not invented by himBthe device had not been invented by himChe was not the inventor of the particular deviceDhe would not have invented the deviceEhe did not invent the device
单选题Which option correctly identifies the Cisco IOS switching methods in descending order from the fastest method to the slowest method？（）ACEF， distributed CEF （dCEF）， fast switching， process switchingBdistributed CEF （dCEF）， CEF， fast switching， process switchingCfast switching， process switching， distributed CEF （dCEF）， CEFDprocess switching， fast switching， distributed CEF （dCEF）， CEFEprocess switching， distributed CEF （dCEF）， CEF， fast switchingFprocess switching， CEF， distributed CEF （dCEF）， fast switching
单选题Which of the following is not a characteristic of fast switching？（）AFast switching reducesa routers CPU utilization， compared to process switchingBAll packets of a flow， except for the first packet， use the information in the fast cacheCIt can be enabled with the interface command ip route-cacheDFast switching uses a fast cache maintained in a router’s control planeEThe fast cache contains information about how traffic from different data flows should beforwardedFEven though the fast switching is enabled， the first packet of a flow is still process switched