计算机网络与通信期末考试B精选答案0001Word格式文档下载.docx
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计算机网络与通信期末考试B精选答案0001Word格式文档下载.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分组父换
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.transportlayer
C・networklayer
D.
linklayer
3.AisaCircuit-switchednetwork.
circuitnetwork
protocols?
6.Whatisusedtospecifyplacementoftext,filesandobjectsthat
aretobetransferredfromthewebservertothedient?
B
above
7•bandwidthisdescribedin_B—
C)
D)centimeters
megabitspermillisecond
8.)_BIsaprotocolfortransferringafilefromonehosttoanother
host.
D.UDP
A.SMTP;
B.FTP;
C.TCP;
InTCP/IPstack,thetransportlayersflowcontrolmechanismuses
C)threehand-shaking
D)slidingwindow
10•Comparedwithrdt2・0,thenewservicein:
rdt3・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一to一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
16•Theoutputportofarouterdon'
tperform_C_functions.
B)thedatalinklayer
A)thephysicallayerfunctions
functions
17•Therearetwobroadclassesofpacket-switchednetworks:
datagram
networksandvirtual-circuit
networks・datagramnetworksforwardpackets
intheirswitchesuseB
A)MACaddresses
B)IPaddresses
C)e-mailaddresses
D)virtual-circuitnumbers
18..asshowbelow,whichtechnologyisn,ttypicalaccessnetworks
technongy.C
A)
digitalsubscriberline
B)hybrid
fiber-coaxialcable
C)circuitswitching
D)wireless
access
19•Whichlayer-functionismostlyimplementedinanadapter
(NIC)
A)physicallayerandlinklayer
B)networklayerandtransportlayer
C)physicallayerandnetworklayerD)
transport
layerand
applicationlayer
collision
20•AWhichdevicecantisolatethedepartmentaldomains.
A)Hub;
B)switch;
C)router;
D)AandB
注:
1试题字迹务必清晰,书写工整。
第1页
2题间不留空,一般应题卷分幵
3务必用A4纸打印
本题4页,本页为
教务处试题编号:
三、填空题(每空1分,共20分?
)
1.・protocolsdefineformat,orderofmessagessentandreceived
amongnetworkentities,andactionstakenonmessagetransmission,receipt.
2.Thetimerequiredtoexaminethepacketsheaderanddeterminewhere
todirectthepacketispartofthe_processingdelay.
3.
thatforwardspacketsaccordingtohostdestination
Anynetworkaddresses
a.datagramnetwork.
4.WithintheInternetthemostimportantdelaysthatpacketsufferedare
.processingdelay,queuingdelay,__ropagation
delay,and-transmissiondelay.
5.forwarding
Twoimportantnetwork-layerfunctioncanbeidentified:
routing
6.Alink-layer
calledaaddress,or
addressisvariously
.physicaladdress,or_MACaddress.
7・Twogenericformsofpipelinedreliabledatetransferprotocolsare_
go-Back-Nand_selectiverepeat
8.10.AWebcachealsocalleda
_proxy_server
11・Supposeausersitting
inahomenetworkbehindhost10.0.0.1requests
attheNAT:
router.Fillindatagramthatineludeportnumbersaswellas
IPaddresses.(WIP缺端口号—个扣0.5分)
andcongestioncontrol(F)
3.AnARPresponsesentwithina
framewithaspecificdestinationIPaddress
(F)
4.linklayeraddressisLANaddress(T)
5.Socketistheprogramminginterfacebetweentheapplicationlayerand
thenetworklayer(F)
6.Routinginvolvesallofanetworksrouters(T)
7.ForwardingtableisconfiguredbybothIntraandInter~ASrouting
algorithm(X)
8.Anynetworkthatforwardspacketsaccordingtohostdestination
addressesisaVCnetwork(F)
9.
10.
HTTPismainlyapushprotocolandSMTPismainlyapullprotocol(N)
Thebasicserviceoflinklayeristomoveanetwork-layer
datagramfrom
onenode\routerorhost)toanadjacentnode.(N)
第2页
2题间不留空,一般应题卷分幵
whatistheCRCbits?
Pleasewritethewholecomputecourse・10
答案:
ThegeneratorbitsG二1001,r=3
r
R=remainder[D*2/G]
CRCbitsisOil
第4页
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