网络工程师英语复习练习题10套.docx

网络工程师英语复习练习题10套.docx

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网络工程师英语复习练习题10套

软件水平考试网络工程师英语复习练习题10套

第1套

ISDN,whichstandsforIntegratedServicesDigitalNetwork,isasystemofdigitalphoneconnections,whichhasbeenavailableforoveradecade.Thissystemallowsdatatobetransmittedsimultaneouslyacrosstheworldusing

（1）digitalconnectivity.WithISDN,voiceanddataarecarriedbybearerchannelsoccupyingabandwithof

（2）（bitspersecond）.SomeswitcheslimitBchannelstocapacityof56Kbps.Adatachannel（3）handlessignalingat16Kbpsor64Kbps,dependingon（4）.Notethat,inISDNterminology,”k”means（5）,andnot1024（2^10）asinmanycomputerapplications.therefore,a64Kbpschannelcarriesdataatarateof64000bps.Anewsetofstandardprefixeshasrecentlybeencreatedtohandlethis.Underthisscheme,”K”（Kilo）means1000（10^3）,”M”（Mega）means1000000（10^6）,andsoon,and“Ki”（Kibi）means1024（2^10）,”Mi”（Mebi）means1048576（2^20）.andsoon。

（1）.A.Multi-endsB.circleC.indirectD.end-to-end

（2）.A.34KbpsB.84KbpsC.64KbpsD.54Kbps

（3）.A.DchannelB.AchannelC.BchannelD.Cchannel

（4）.A.themethodB.thenumberC.theservicetypeD.theusertype

（5）.A.100000（10^5）B.1000（10^3）C.10000（10^4）D.100（10^2）

答案:

1:

D,2:

C,3:

A,4:

C,5:

B

第2套

Bluetoothisauniversalradiointerfaceinthe

（1）frequencybandthatenablesportablecelectronicdevices

（2）connectandcommunicate（3）viashortrange,adhocnetworks.Eachunitcansimultaneouslycommunicatewithupto（4）otherunitsperpiconet.Moreover,eachunitcansimultaneously（5）toseveralpiconets,BluetoothtechnologywhichapartfromEricsson,hasgainedthesupportofNokia,IBM,Toshiba,Intelandmanyothermanufactures,eliminatestheneedforwires,cablesandconnectorsforandbetweencordlessormobilephones,modems,headsets,PDAs,Computes,printers,progjectors,localaresnetworks,andsoon,andpavesthewayfornewandcompletelydifferentdevicesandapplications.

（1）.A.2.45GHzB.4.45GHzC.2.95GHzD.3.45GHz

（2）.A.inB.onC.toD.with

（3）.A.narrowlyB.wirelesslyC.freelyD.widely

（4）.A.useB.severC.hostD.base

（5）.A.relateB.addC.closeD.belong

答案:

1:

A,2:

C,3:

B,4:

B,5:

D

第3套

（1）isusedtoensuretheconfidentiality,integrityandauthenticityofthetwoendpointsintheprivatenetwork.the

（2）,anapplicationlayerprotocol,authenticateseachpeerinanIPsectransaction,IKEnegotiatessecuritypolicy,determiningwhichalgorithmmaybeusedtosetuptheRunnel.Italsohandlestheexchangofsessionkeysusedforthatonetransaction.Networksthatuse（3）tosecuredatatrafficcanautomaticallyauthenticatedevicesbyusing（4）whichVerifytheidentitiesofthetwouserswhoaresendinginformationbackandforth.IPseccanbeidealwaytosecuredatainlargenetworksthatrequire（5）connectionsamongmanydevices。

（1）A.EncryptionB.CodeC.CertificateD.Tunnel

（2）A.associatedlinksB.InternetKeyExchangeCIPsecD.encryption

（3）AauthenticityB.passwordC.IPsecD.InternetKeyExchange

（4）A.protocolsB.keywordsC.IKED.digitalcertificates

（5）A.freeB.strictC.secureD.remote

答案:

1:

A,2:

B,3:

C,4:

D,5:

C

第4套

LAPBisa

（1）protocolthatprovidescompletedatatransparencyina

（2）operation.Itsupportsapeer-to-peerlinkinthatneitherendofthelinkplaystheroleofthepermanentmasterstation.HDLCLAPBisthe（3）thatisusuallyusedby（4）,the（5）standardforPacketSwitchedNetworks.

（1）A．bit-orientedsynchronousB．byte-orientedsynchronous

C．bit-orientedasynchronousD．byte-orientedasynchronous

（2）A．half-duplexpoint-to-pointB．half-duplexpoint-to-points

C．full-duplexpoint-to-pointD．full-duplexpoint-to-points

（3）A．PhysicalLayerB．LinkLayer

C．NetworkLayerD．TransportLayer

（4）A．X.21B．X.25C．X.28D．X.29

（5）A．ITUB．IEEEC．OSID．ANSI

答案:

1:

A,2:

C,3:

B,4:

B,5:

A

第5套

Datacommunicationsequipment（DEC）

（1）theserialdatastreamfromtheDTEandconvertsittosomeformof

（2）suitableoftransmissiononvoicegradelines.Atthe（3）,theDCEperformsthereversefunctionofconveringthereceivedanalogsignaltoserialdigitaldatastream.ThesimplestformofDCEisa（4）ordataset.Atthetransmitend,themodemcanbeconsideredaformof（5）,whileatthereceiveend,itcanbeconsideredaformofanalogtodigitalconverter.Themostcommonformsofmodulationbymodemsarefrequencyshiftkeying（FSK）,phaseshiftkeying（PSK）,andquadratureamplitudemodulation（QAM）.IfthecablesandsignallevelsusedtointerconnecttheDTEandDCEwereleftunregulated,thevariationsgeneratedwouldprobablybeproporationtothenumberofmanufactures.ElectronicsIndustriesAssociation（EIA）,anorganizationofmanufactuuersconcernedwithestablishingindustrystandards,haveagreedontheRS-232CasthestandardinterfacebetweentheDTEandthemodem.Thisisa25pincablepinshavedesignatedfuntonsandspecifiedsignallevels.

（1）A.acceptsB.sendsC.deliversD.receives

（2）A.digitalsignalB.analogsignalC.lightsignalD.soundsignal

（3）A.backendB.frontendC.sendingendD.receiveend

（4）A.modemB.cpuC.demodulatorD.modulator.

（5）A.hostcomputerB.digitaltoanalogconverter

C.analogtodigitalconverterD.secondaries

答案:

1:

A,2:

B,3:

D,4:

A,5:

B

第6套

InATM,cellsserveasuniversalunitsforallinformationtypes:

data,voice,video,etc,Sinceswitchesknowbeforehandthesizeandformatofeachinformationunitsentthroughthenetwork,switcharchitecturescanbe1）,Futhermore,sincetheCMSdeterminestheconnectionpathduringconnectionsetup,switchesdonothavetomakecomplexroutingdecisionsona

（2）basis.Communiciationpathscanbe“hardwired”intotheswitch’scircuitstoenablefast,simpledecisions.Hardwaretechniques,usingVLSIbasedstatemachinesand,inthefuture,opticalswitchingtechniques,canbeappliedtoswitches.HardwareBasedswitchmatricestakeadvantageofallthese（3）characteristics.ThematrixapproachtoimplementingcellswitchinggreatlyincreasesthescalabilityofATMbasedsolutions,Onefundamentaladvantageofmatrixbasedswitchesisthat,asmoreportsareaddedtotheswitchingcomplex,theaggregateswitchingcapacityoftheswitchincreases.Inotherwords,as（4）areaddedtoaswitchednetwork,theytapintoanincreasingbandwidthpool-thecompleteoppositeofsharedmedianetworks,whereuserareforcedtosharesmallerandsmallerslicesofafixedamountof（5）.Simplyput,cellswitchingbasedonATMenablesextremelyfast,massivelyscalablenetwordks.

（1）A.optimizedB.increasedC.decreasedD.fixed

（2）A.cellbycellB.objectorientedC.bit-by-bitD.LAN

（3）A.VLSIB.OSIC.CMSD.ATM

（4）A.cellsB.switchesC.usersD.approaches

（5）A.dataB.mediaC.bandwidthD.information

答案:

1:

A,2:

A,3:

D,4:

C,5:

C

第7套

Adigitalwalletis

（1）thatenablesuserstopayforgoodsontheweb.Itholdscreditcardnumbersandother

（2）suchasshippingaddress.Onceentered,thedataautomaticallypopulatesorderfieldsatmerchantsites.Whenusingadigitalwallet,consumersdon’tneedtofilloutorderformsoneachsitewhentheypurchaseanitembecausetheinformationhasalreadybeen（3）andisautomatically（4）andenteredintotheorderfieldsacrossmerchantsites.Consumersalsobenefitwhenusingdigitalwalletsbecausetheirinformationis（5）orprotechtedaprivatesoftwarecode.Andmerchantsbenefitbyreceivingprotectionagainstfraud.

（1）A.softwareB.hardwareC.deviceD.document

（2）A.cardsB.secretsC.publicinformationD.personinformation

（3）A.distributedB.storedC.addressedD.registered

（4）A.codedB.0updatedC.correctedD.named

（5）A.encryptedB.0updatedC.securedD.undiscovered

答案:

1:

A,2:

D,3:

B,4:

B,5:

A

第8套

Therouterinspectersthepacket’sIPaddressandperforms

（1）lookuptoseeifthedestinationendstationresidesonthelocal（physicallyconnected）network,typicallycalledanIPsubber

（2）usuallyisassigntedtoeachoftherouter’snetworkinterface.IfthedestinationIPaddressislocal,theroutersearchesaninternalstoreofIPaddressandlocal-deviceMediaAcessControl（MAC）address.Thisstoreisknownasthe（3）cache.AddressResolutionProtocol（ARP）istheuniversaltoolformatchingIPaddressestoMACaddress.Ifthedestination’sMACaddressappears,therouterinstallsthatMACaddressinthepachetheader（removingitsownMACaddressbecausethat’snolongerneeded）andsendsthepackettothedestionalendstation.IntheeventthatthedestionalMACaddressdoesnotappearintheARPcache-itmighthavetimedout,forinstance-theroutermustbroadcastanARPrequesttothesubnetreferencedbythepacket’sdestionalIPaddress.TheendstationwiththatIPaddressresponds,sendingbackitsMACaddress.Therouter0updatesitscache,installsthenewMACaddressintothe（4）andlaunchesthepacket.Iftheroutertablelookupshowsthatthepacketisdestinedforanonlocalsubnet,therouterforwardsthepackettothenext-hoprouterusingthe-hoprouter’sMACaddress.Routingtablesarecontinuouslybuiltandrebuiltbyintelligentdiscoveryprotocols,suchasRoutingInformationProtocolorOpenShortestPathFirst（OSPF）.Eachrouter’sroutingtableshowsthebestroutetothedestinationaddress:

foraddressthatmaybeseverdhopsaway,itshows（5）next-hoprouter.

（1）A.aroutertableB.asignalC.ane-mailD.afile

（2）A.ATCPsubnetB.IPheaderC.AnIPsubnetD.TCP/IP

（3）A.OSPFB.AddressResolutionProtocol（ARP）C.MACD.RIP

（4）A.smallpacketB.spaceC.packetheaderD.packettailor

（5）A.thefewestB.theworstC.theleastD.thebest

答案:

1:

A,2:

C,3:

B,4:

C,5:

D

第9套

_

（1）__isusedtoensuretheconfidentiality,integrityandauthenticityofthetwoendpointsintheprivateetwork.the__

（2）__,anapplicationlayerprotocol,authenticateseachpeerinanIPsectransaction,IKEnegotiatessecuritypolicy,determiningwhichalgorithmmaybeusedtosetuptheRunnel.Itals