计算机网络原理期末试卷2012级Word文档下载推荐.docx
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计算机网络原理期末试卷2012级Word文档下载推荐.docx
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4.(D)isthesubnetmaskoftheIPaddressblockof192.169.15.136/29.
A.255.255.255.192 B.255.255.255.240 C.255.255.255.224D.255.255.255.248
5.(A)shouldbeusedforenablingahosttocommunicatewithanotherhostonadifferentIPnetwork.
A.switch B.hub C.router D.host
6.InCSMA/CD,afterthethirdcollision,theprobabilityis(D)thatthevalueofKthatanodechoosesis2.
A.0 B.0.33 C.0.25 D.0.125
7.Ifthesequencenumberhaskbits,whatthemaximumofslidewindowis(C)inSelectiveRepeatprotocol.
A.2k B.2k-1 C.2k-1 D.2k+1
8.Theretransmissiontimeout(超时)interval(间隔)inTCPexpressedbyTimeoutInterval,whichsatisfiestheequationof‘TimeoutInterval=EstimatedRTT+4*DevRTT’.Themeaningof‘EstimatedRTT’is(c).
A.ThepredictedvalueofRTToflasttransferredpacket
B.SAMPLERTT
C.ThepredictedvalueofRTTofpackettobeimmediatelysent
D.TheaveragevalueofallRTT
9.AnEthernetswitchreadstheentiredataframe,completesthedataframeerrorcheckingandthenforwards,thisswitchmethodiscalled(A).
A.store-and-forwardswitchB.cut-throughswitch
C.No-fragmentswitchD.No-errorswitch
10.(B)isanclassBIPaddressinfollowingIPaddresses?
()
A. 223.1.1.1 B.191.1.1.1 C.192.1.1.1 D.228.1.1.1
Ⅱ、Fillinblanks(1pointseachblank,total5points)
1.Coaxialcable,光纤andradioarethephysicalmediathatnetworkcanrunover.
2.IPaddressand端口号areusedbyaprocessrunningononehosttoidentifyaprocessrunningonanotherhost。
3.Considersendinga3000bytedatagramintoalinkthathasanMTUof500bytes.Howmanyfragmentsaregenerated7.
4.Therearetwobroadclassesofpacket-switchednetworks:
virtualcircuitand数据报network.
5.Abittimeisequalto1/10^7secondsfora10MbpsEthernet.
Ⅲ、Trueorfalse(1pointsforeachitem,total10points)
1.TheData:
headerintheHTTPresponsemessageindicateswhentheobjectintheresponsewaslastmodified. (F)
2.ThereceivewindowsizeofGBNprotocolisgreaterthan1. (F)
3.LinklayerprotocolisimplementedbyEthernetAdapter(书上写的是Networkinformationcard,NetworkAdapter)(以太网适配器,网卡)inEthernetNetwork.(T)
4.ARPtablesinnodesareestablishedbyself-learningthemselves(不是self-learning). (F)
5.TheslottedALOHAprotocolmakesmoreefficientinusingofthenetworkbandwidththanthepureALOHAprotocol. (T)
6.TheOSPFisarouteprotocolrelatedtodistancevectorroutingalgorithm. (F)
7.ThePPPoEisaPPP(PtoPProtocol)protocolthatitrunsoverEthernet. (T)
8.TheUDPheaderchecksumisrecomputedateveryrouters. (F)
9.TherearenocollisionsinCSMAprotocolbecauseithasdetectedthatthechannelisidlebeforetransmitsframe. (F)
10.Ingeneral,efficiency(效率)oftheCSMAprotocolchannelisbetterthantheSlottedALOHA.
(T)
Ⅳ、Pleaseanswerfollowingquestion(total30points)
1.WhatarethefivelayersintheInternetprotocolstack?
Whataretheprincipalresponsibilitiesforeachoftheselayers?
(5points)
1.应用层:
应用层是网络应用程序及其应用程协议停留的地方;
2.运输层:
运输层提供了在应用程序端点之间传送应用层报文的服务;
3.网络层:
因特网的网络层负责将称为数据报的网络层分组从一台主机移动到另一台主机;
4.链路层:
链路层将网络层传来的数据报沿着路径将数据传递给下一个结点;
5.物理层:
物理层的任务是将链路层传来的帧中的数据一个比特一个比特从一个节点移动到下一个结点;
2.Whichprotocolsareinter-ASsandintra-ASsprotocolsrespectively(各自的)usedintheInternet(5points)
Inter-ASs:
OSPF,BGP
Intra-Ass:
RIP,OSPF,IGRP
3.Considerthegenerator,G=1001,andsupposethatDhasthevalueof11001001.WhatarethebitsofCRCR?
WhatisthedatafortransferringwithCRCcode?
(5points).
011,11001001011
4.UDPandTCPuse1scomplementfortheirchecksums.Supposeyouhavethefollowingthree8-bitbytes01101010,01001111,01110011.Whatisthechecksumofthese8-bitbytes?
01101010
01001111
--------------------
10111001
01110011
---------------------
100101100
1
----------------------
00101101
5.WhatisthedifferentbetweenMACaddressandIPaddress?
mac是在在生产是就确认的,由网卡生产厂家烧入网卡的EPROM(一种闪存芯片,通常可以通过程序擦写),它存储的是传输数据时真正赖以标识发出数据的电脑和接收数据的主机的地址。
IP地址就是给每个连接在Internet上的主机分配的一个32bit地址。
32-bitIPaddress:
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