计算机网络教程自顶向下方法选择题及答案-Chapt-4-Network-Layer-QUIZZ.docx

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1、Chapter4NetworkLayer.PacketizingatthenetworklayerinvolvesA) EncapsulatingthepayloadatthesourceB) AddsaheaderthatcontainsthesourceanddestinationinformationC) DecapsulatingthepayloadatthedestinationD) Allofthechoicesarecorrect2.Routersinthepatharenotallowedto.A) fragmentthepackettheyreceiveB) decapsul

2、atethepacketC) changesourceordestinationaddressD) Allofthechoicesarecorrectl l J VH/ ABCDThenetworklayerintheIprehensiveerrorandflowcontrol,limitederrorcontrol,butnoflowcontrol,comprehensiveerrorcontrolbutlimitedflowcontrol.Allofthechoicesarecorrect4.Inavirtual-circuitapproach,theforwardingdecisioni

3、sbasedonthevalueofthefieldinthepacketheader.a)b)qd)sourceaddressdestinationaddresslabelNoneofthechoicesarecorrect5.Inadatagramapproach,theforwardingdecisionisbasedonthevalueofthefieldinthepacketheader.A)B)QD)sourceaddressdestinationaddresslabelNoneofthechoicesarecorrect6.Theperformanceofanetworkcanb

4、emeasuredintermsof.A)B)QD)delaythroughputpacketlossallofthechoicesarecorrect7.Transmissiondelay(time)istheratioof.A) transmissionratetopacketlengthB) transmissionratetodistanceC) packetlengthtotransmissionrateD) processingtimetotransmissionrate8.l ) n IHf ABCDPropagationdelay(time)istheratioof.trans

5、missionratetopropagationspeedpropagationspeedtodistancepacketlengthtopropagationspeeddistancetopropagationspeed9.Whentheloadinthenetworkreachesthenetworkcapacity,thepacketdelayandtheA)B)QD)networkthroughputreaches.increasessharply;itsminimumincreasessharply;itsmaximumdecreasessharply;itsminimumdecre

6、asessharply;itsmaximum10.Inopen-loopcongestioncontrol,policiesareapplied.A) topreventcongestionbeforeithappensB) toalleviatecongestionafterithappensC) toeitherpreventcongestionbeforeithappensortoalleviatecongestionafterithappensD) Noneofthechoicesarecorrect11.Thetechniqueisoneoftheopen-loopcongestio

7、npolicyA) backpressureB) chokepacketC) implicitsignaling- a12.heA)B)QD)13.lplA)B)QD)D) Noneofthechoicesarecorrecttechniqueisoneoftheclose-loopcongestionpolicyacknowledgmentpolicychokepacketdiscardingpolicyNoneofthechoicesarecorrectprotocol.connection-orientedunreliableconnection-orientedreliableconn

8、ectionlessunreliableconnectionlessreliable14.AnHLENvalueofdecimal10means.A) thereare10bytesofoptionsB) thereare10bytesintheheaderC) thereare40bytesofoptionsD) thereare40bytesintheheader15.Ifthefragmentoffsethasavalueof100,itmeansthat.A) thedatagramhasnotbeenfragmentedB) thedatagramis100bytesinsizeC)

9、 thefirstbyteofthedatagramisbyte800D) Noneofthechoicesarecorrect16.Whatisneededtodeterminethenumberofthelastbyteofafragment?A) offsetnumberB) totallengthC) bothoffsetnumberandthetotallengthD) Noneofthechoicesarecorrect17.TheIPheadersizeisbyteslong.A) 20to60B) 20C) 60D) Noneofthechoicesarecorrect18.A

10、)B)0D)PacketsintheIPlayerarecalled.segmentsdatagramsframesNoneofthechoicesarecorrect19.Thetotallengthfielddefinesthetotallengthofthedatagram.A) includingtheheaderB) excludingtheheaderC) excludingtheoptionlengthD) Noneofthechoicesarecorrect20.Whenadatagramisencapsulatedinaframe,thetotalsizeofthedatag

11、rammustbelessthanthel %)/ 1 H ABCDMUTMATMTUNoneofthechoicesarecorrect21.AnIPv4addressisnormallyrepresentedinbaseindotted-decimalnotation.A) 16B) 256C) 10D) Noneofthechoicesarecorrectintoclasses.5Noneofthechoicesarecorrect23.ThenumberofaddressesassignedtoanorganizationinclasslessaddressingA) canbeany

12、numberB) mustbeamultipleof256C) mustbeapowerof2D) Noneofthechoicesarecorrect24.Thefirstaddressassignedtoanorganizationinclasslessaddressing.A) mustbeevenlydivisiblebythenumberofaddressesintheorganizationB) mustbedivisibleby128C) mustbelongtooneoftheA,B,orCclassesD) Noneofthechoicesarecorrect25lnA)B)

13、QD)subnetting,thenumberofaddressesineachsubnetmust.beapowerof2beamultipleof128bedivisibleby128Noneofthechoicesarecorrect26.WhatisthedefaultprefixlengthforclassAinCIDRnotation?9816NoneofthechoicesarecorrectA)B)Q627.WhatisthedefaultprefixlengthforclassBinCIDRnotation?9816Noneofthechoicesarecorrecta)b)

14、qd)28.WhatA)B)QisthedefaultprefixlengthforclassCinCIDRnotation?24816D)Noneofthechoicesarecorrect29.DHCPisa(an)layerprotocol,applicationtransportnetworkdata-linkA)B)QD)30.InDHCBtheclientusesportandtheserverusesport,anephemeral;awell-knownawell-known;awell-knownawell-known;anephemeralNoneofthechoicesa

15、recorrectA)B)QD)31.DHCPusestheservicesof.UDPTCPIPNoneofthechoicesarecorrecta)b)c)d32.allowsasitetouseasetofprivateaddressesforinternalcommunicationandasetofglobalInternetaddressesforcommunicationwiththerestoftheworld.A) DHCPB) NAC) IMCPD) Noneofthechoicesarecorrect33.Theideaofaddressaggregationwasdesignedtoalleviatetheincr