计算机网络与通信期末考试B精选答案0001Word下载.docx
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计算机网络与通信期末考试B精选答案0001Word下载.docx
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办法》、《四川大学考场规则》和《四川大学监考人员职责》。
有违反学校有关规定
的,严格按照《四川大学教学事故认定及处理办法》进行处理。
第一题
第二题
第三题
第四题
第五题
总分
一、英译汉(10分)
1.ISPINTERT服务供应商2.NIC网络接口卡3.DNS域名服务系
统4.MA(介质接入控制5BGP边界网关协议
6.MSS最大数据段尺寸7.FTP文件传输协议8MPLS多协议标签交
换9AS自治系统10.packetswitching分组交换
二、单项选择题(每小题1.5分,共30分)
1.Werefertothelink-layerpacketsasD
A.messagesB.segmentsC.datagramsD.frames
2.TheIPprotocolliesinC
A.applicationlayer
B.transportlayerC.networklayerD.
linklayer
3.AisaCircuit-switchednetwork.
A.TDMB.DatagramnetworkC.InternetD.virtual
circuitnetwork
4.Thepacketexperiences
aBdelayasitwaitstobetransmitted
ontothelink.
A.processingdelay
B.queuingdelayCpropagationdelay
D.transmissiondelay
5.DWhichthefollowingprotocolsdoesnotuseTCP/IPasitsunderlying
protocols?
A.SMTP;
B.FTP;
C.TELNET;
D.TFTP
6.Whatisusedtospecifyplacementoftext,filesandobjectsthat
aretobetransferredfromthewebservertotheclient?
B
A.HTTPB.HTML
C.HDLCD.Allofthe
above
7.bandwidthisdescribedin
_B__
A)Bytespersecond
B)Bitspersecond
C)megabitspermillisecondD)centimeters
8.)_BIsaprotocolfortransferringafilefromonehosttoanother
host.
9.InTCP/IPstack,thetransportlayer'
sflowcontrolmechanismuses
A)slowstartB)congestionavoidanee
C)threehand-shakingD)slidingwindow
10.Comparedwithrdt2.0,thenewserviceinrdt3.0istoimplementthe
reliabledatatransferoverthechannelwithB
A)biterrorB)datalossC)datatransferdelayD)
congestion
11.ICMPcontrolmessagesaretransferredinDdataunit.
A)TCPB).UDPC).ARPD).IP
12.Thereliabledatadeliverybetweenendsystemsisprovidedinthe
ClayerofTCP/IParchitecture.
A)networklayerB)datalinklayerC)transportlayerD)
sessionlayer
13.Whatisthemainfunctionofthenetworklayer?
A
A.node-to-nodedelivery;
B.process-to-process
messagedelivery
Csynchronization;
D.updatingand
maintenanceofroutingtables
14.WhichIPaddressisineffectiveD.
A)202.131.45.61B)127.0.0.1
C)192.168.0.2
15.IfIPaddressis198.108.126.66224,thensubnetprefixis_C.
A)198.108.126.60B)198.108.126.0
C)198.108.126.64D)198.108.126.224
16.Theoutputportofarouterdon'
tperform_C__functions.
A)thephysicallayerfunctionsB)thedatalinklayer
functions
C)networkmanagement
D)buffermanagement
17.Therearetwobroadclassesofpacket-switchednetworks:
datagram
networksandvirtual-circuit
networks.datagramnetworksforwardpackets
intheirswitchesuse__B
A)MACaddresses
B)IPaddresses
C)e-mailaddresses
D)virtual-circuitnumbers
18..asshowbelow,whichtechnologyisn'
ttypicalaccessnetworks
technongy.C
A)digitalsubscriberlineB)hybrid
fiber-coaxialcable
C)circuitswitchingD)wireless
access
19.Whichlayer-functionismostlyimplementedinanadapter(NIC)
A
A)physicallayerandlinklayerB)networklayerandtransportlayer
C)physicallayerandnetworklayerD)transportlayerand
applicationlayer
20.AWhichdevicecan'
tisolatethedepartmentalcollision
domains.
A)Hub;
B)switch;
C)router;
D)AandB
注:
1试题字迹务必清晰,书写工整。
本题4页,本页为
第1页
2题间不留空,一般应题卷分幵教务处试题编号:
3务必用A4纸打印
三、填空题(每空1分,共20分?
)
1..protocolsdefineformat,orderofmessagessentandreceived
amongnetworkentities,andactionstakenonmessagetransmission,receipt.
2.Thetimerequiredtoexaminethepacket'
sheaderanddeterminewhere
todirectthepacketispartofthe__processingdelay.
3.Anynetworkthatforwardspacketsaccordingtohostdestinationaddresses
a.datagramnetwork.
4.WithintheInternetthemostimportantdelaysthatpacketsufferedare
.processingdelay,queuingdelay,__propagation
delay,and_transmissiondelay.
5.Twoimportantnetwork-layerfunctioncanbeidentified:
forwarding
routing_.
6.Alink-layeraddressisvariouslycalleda_lan_address,or
_physical__address,or_MACaddress.
7.Twogenericformsofpipelinedreliabledatetransferprotocolsare_
go-Back-Nand_selectiverepeat_
8.10.AWebcachealsocalleda_proxy__server._
11.Supposeausersittinginahomenetworkbehindhost10.0.0.1requests
aWebpageonsomeWebserverPleaseaccordingtheNATtranslationtable
attheNATrouter.Fillindatagramthatincludeportnumbersaswellas
IPaddresses.(有IP缺端口号一个扣0.5分)
NATtranstationtable
sconnectionle4sservicemakesprovisionforflowcontrol
andcongestioncontrol(F)
3.AnARPresponsesentwithinaframewithaspecificdestinationIPaddress
(F)
4.linklayeraddressisLANaddress(T)
5.Socketistheprogramminginterfacebetweentheapplicationlayerand
thenetworklayer(F)
6.Routinginvolvesallofanetwork'
srouters(T)
7.ForwardingtableisconfiguredbybothIntraandInter-ASrouting
algorithm(N)
8.Anynetworkthatforwardspacketsaccordingtohostdestination
addressesisaVCnetwork(F)
9.HTTPismainlyapushprotocolandSMTPismainlyapullprotocol(N)
10.Thebasicserviceoflinklayeristomoveanetwork-layerdatagramfrom
onenode(routerorhost)toanadjacentnode.(N)
第2页
2题间不留空,一般应题卷分幵教务处试题编号:
2题间不留空,一般应题卷分幵教务处试题编号:
3务必用A4纸打印
3
3.Supposethegeneratorpolynomialisx+1,databitstobesentDis,
whatistheCRCbits?
Pleasewritethewholecomputecourse.10
答案:
ThegeneratorbitsG=1001,r=3
r
R=remainder[D*2/G]
CRCbitsis011
本题4页,本页为
教务处试题编号:
第4页
2题间不留空,一般应题卷分幵
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