计算机专业英语影印版(computing essentials 2008)课后答案大全——第九单元communications and networks

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1、ComputingEssentials2008Chapter9:CommunicationsandNetworksKeyTermsKeyTermDefinition3Gcellularnetwork(249)AcomputernetworkthatallowsuserstodownloaddatafromtheInternetat400to700Kbpsusingcellphonetechnology.analogsignal(247)Continuouselectronicwaves.asymmetricdigitalsubscriber

2、line(ADSL)(248)ThemostwidelyusedtypesofDSL.backbone(258)Acommonconnectingcableonwhichallcommunicationstravelalong.(seealsobus)bandwidth(249)Ameasurementofthewidthorcapacityofthecommunicationchannel.basestation(254)Anetwork’scentrallylocatedreceiverthatinterpretsincomingrad

3、iofrequenciesandroutescommunicationstotheappropriatedevices.(seealsowirelessreceiver)bitspersecond(bps)(247)HowtransferspeedismeasuredBluetooth(245)Ashort-rangewirelesscommunicationstandardthatusesmicrowavestotransmitdataovershortdistancesbroadband(250)Thebandwidthusedforh

4、igh-capacitytransmissions.broadcastradio(245)Usesradiosignalstosendandreceivesignalsfromwirelessdevices.bus(258)Acommonconnectingcableonwhichallcommunicationstravelalong.(seealsobackbone)busnetwork(258)Eachdeviceinthenetworkhandlesitsowncommunicationscontrol.cablemodem(249

5、)Useexistingtelevisioncablestoprovidehigh-speedconnectionstotheInternet.cellularservice(249)Offeranalternativeformobiledevicesandlaptops.client(251)Anodethatrequestsandusesresourcesavailablefromothernodes.client/servernetworksystem(260)Acomputernetworkwhereonecomputercoord

6、inatesandsuppliesservicestoothernodesonthenetwork.coaxialcable(244)Ahigh-frequencytransmissioncablewithasinglesolid-coppercore.Communicationchannel(244)Theactualconnectingortransmissionmediumthatcarriesthemessage.Communicationsystem(243)Anelectronicsystemthattransmitdatafr

7、omonelocationtoanothercomputernetwork(251)Acommunicationsystemthatconnectstwoormorecomputerssothattheycanexchangeinformationandshareresources.connectivity(242)Usingcomputernetworkstolinkpeopleandresources.demodulation(247)Theprocessofconvertingfromanalogtodigital.dial-upse

8、rvice(248)UsingstandardtelephonelinesandconventionalmodemstolinktotheInternetorothercompu