四川大学期末SSD2考试试题B卷.docx
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四川大学期末SSD2考试试题B卷.docx
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四川大学期末SSD2考试试题B卷
四川大学期末考试试题(闭卷)
(2008-2009学年第1学期)
课程号:
311016040课序号:
课程名称:
计算机系统导论(B卷)任课教师:
张磊尹皓吴琼
适用专业年级:
软件工程2008级学生人数:
印题份数:
学号:
姓名:
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一、单项选择题(在每小题的四个备选答案中,选出一个正确的答案。
每小题1分,共40分)
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1.Howmanybitsarerequiredtostoreanygivennumberintherange0to255?
(a)16(b)32(c)8(d)4
2.Whatisthebinaryequivalentofthedecimalnumber123?
(a)1111111(b)1111011(c)1101110(d)1111101
3.AnArithmetic/LogicUnittypicallyperformswhichofthefollowingoperations?
I.RetrievalofinstructionsfromRAM
II.Performanceofgreater-thanandless-thancomparisons
(a)IIonly(b)Ionly(c)None(d)IandII
4.WhichofthefollowingkindsofprojectstypicallyrequiresaspecialtypeofCPUthatwouldnotbefoundinadesktopormainframecomputer?
a.Monitoringtheoperationofanautomobileengine
b.Performingbusinesscalculationsforafinancialreport
c.Lookingupandstoringinformationoncustomeraccounts
d.Processingrequeststosendandreceiveemail
5.Computeroutputdevicesincludewhichofthefollowing?
I.ProjectorII.MicrophoneIII.Printer
(a)I,II,andIII(b)IIandIIIonly(c)IandIIonly(d)IandIIIonly
6.Ofthefollowingtypesofstorage,whichprovidesthefastestaccesstodata?
(a)RAM(b)CD-ROM(c)harddisk(d)cache
7.Floppydiskstypicallyholdabout_____ofdata,whileharddiskdrivestypicallyholdseveral_____ofdata
(a)100KB,GBs(b)10MB,TBs(c)1MB,GBs(d)1MB,TBs
8.WhyisitimportanttohavelargeamountsofRAMinacomputersystem?
(a)ProgramscannotaccessfilesunlesstheentirefileisfirstloadedintoRAM.
(b)RAMcontinuestobelessexpensivethanharddiskmemory.
(c)YoucannotloadandexecuteaprogramunlessthereissufficientRAMtoholdallofaprogram'sCPUinstructions.
(d)MultitaskingandlargeprogramsrunslowlyifthereisinsufficientRAM.
9.Inacomputer,mostprocessingtakesplaceinthe
(a)RAM(b)CPU(c)ROM(d)LAN
10.Whichofthefollowingstatementsis(are)true?
I.CD-ROMdrivesuselasertechnology.
II.CD-ROMdrivestypicallycannotbeusedtowritedataontodisks.
(a)IIonly(b)None(c)Ionly(d)IandII
11.Inatypicalcomputer,whensavingdatatotheharddisk,thechipsetsendsthedatatothediskcontrollerviathe
(a)AGPbus(b)parallelports(c)serialports(d)PCIbus
12.Inatypicalcomputer,datafromstoragedevicesispassedtothechipsetthroughthe
(a)diskcontroller(b)PCIexpansionslots(c)AGPexpansionslots(d)PS-2ports
13.Computersthatoperateinessentiallythesamewayaresaidtobe
(a)Integrated(b)user-friendly(c)compound(d)compatible
14.Whichofthefollowingsoftwarelayersequencescorrectlyrepresentsthetaskofsavingafilewithatexteditor?
(a)application,operatingsystem,devicedriver,hardware
(b)operatingsystem,application,hardware,devicedriver
(c)application,operatingsystem,hardware,devicedriver
(d)operatingsystem,devicedriver,application,hardware
15.Akeyboardinterruptoccurs:
(a)eachtimeakeyispressed
(b)onlywhentheESCkeyispressed
(c)onlywhentheENTERkeyispressed
(d)whenthepowersupplyisdisconnected
16.Whichofthefollowingis(are)trueregardingtheclustersizeofadiskdrive?
I.Aclusteristhesmallestamountofspacethatafilecanoccupyinadisk.
II.Theclustersizewilldecreaseasthesizeofthediskincreases.
(a)IandII(b)IIonly(c)None(d)Ionly
17.Applicationsthataredesignedtoworktogethertocreatecomplexdocumentscontainingdifferenttypesofdataarereferredtoas
(a)groupware(b)consolidated(c)utilities(d)anofficesuite
18.ThetypeofdatacontainedwithinafileinWindowsisindicatedbythe_____ofthefile.
(a)parentfolder(b)extension(c)attributes(d)content
19.Whichofthefollowingaretrueregardingtheuseofvirtualmemoryinacomputersystem?
I.VirtualmemoryprovidestheillusionofmoreRAMthanactuallyexists.
II.Excessiveuseofvirtualmemorybyacomputersystemcanslowoverallperformance.
III.TheCPUexecutesinstructionsdirectlyfromvirtualmemory.
(a)IandIIIonly(b)I,II,andIII(c)IandIIonly(d)IIandIIIonly
20.Whichofthefollowingis(are)trueofadatabase?
I.Adatabasecancontainavarietyofdifferentrecordformats.
II.Eachdatabasecanhaveonlyonerecordformat.
III.Adatabaseconsolidatesflatfilesintoasinglecollectionofdiverseinformation.
(a)IIandIIIonly(b)IandIIIonly(c)Ionly(d)IIonly
21.Whoofthefollowingfocusesonthesoftwarecomponentofaninformationsystem,includingsoftwaredesign,programming,andtesting?
(a)Systemsanalyst(b)Softwareengineer(c)Databaseadministrator(d)Systemsadministrator
22.Software_____referstotheprocessofdevelopingsoftwareusingsystematicmathematical,engineering,andmanagementtechniques.
(a)programming(b)design(c)algorithmcreation(d)engineering
23.VirtualmemoryinvolvestemporarilymovingunneededinstructionsordatafromRAMto
(a)cachememory(b)acomputeronthenetwork(c)aharddisk(d)theCPU
24.Virtualmemoryaccomplisheswhichofthefollowing?
(a)RequiresprogramstoknowwhatareasofRAMareavailabletobeused
(b)Allowsprogramstoexecutefaster
(c)Operatesintheprocessor'srealaddressmode
(d)Allowslargeprogramstoexecute
25.Inthesoftwaredevelopmentprocess,whichofthefollowingmethodsareusedtoassistprogrammersinfinding"bugs"intheirsoftware?
i.I.Debugging
ii.II.Testing
iii.III.CodeReviews
(a)IandIIIonly(b)IandIIonly(c)I,II,andIII(d)IIandIIIonly
26.Devicedriversfacilitatecommunicationbetweenwhichlayersofthesystem?
(a)Theoperatingsystemandapplicationsusinghardwaredevices
(b)Theoperatingsystemandhardwaredevices
(c)Applicationsandhardwaredevices
(d)Differenthardwaredevices
27.WhichofthefollowingareprogramscontainingsoftwareinstructionstobeexecutedbytheCPU?
I.BIOS
II.Devicedriver
III.Operatingsystem
(a)IandIIIonly(b)IandIIonly(c)IIandIIIonly(d)I,II,andIII
28.Networkstypicallyuse_____cable.
(a)NIC(b)coaxial(c)twistedpair(d)wireless
29.Whichofthefollowingcomponentsarerequiredforanemailsystem?
I.Emailserversoftware
II.Postofficesoftware
III.Emailclientsoftware
(a)IIandIIIonly(b)I,II,andIII(c)IandIIIonly(d)IandIIonly
30.WebpageURLsbeginwith
(a)http:
//(b)url:
//(c)www:
//(d)page:
//
31.WhichofthefollowingaretasksperformedbyaWebbrowser?
I.Sendingarequestforaspecificfiletoaserver
II.Formattinganddisplayingafilereceivedfromaserver
III.Sendingadditionalrequeststotheservertoretrieveanygraphicselementssuchasiconsorimagesforarequestedfile(a)I,II,andIII(b)IIandIIIonly(c)IandIIonly(d)IandIIIonly
32.WhichofthefollowingsymbolsisusedtoseparatedirectorypathsinaURL?
(a).(b)//(c)/(d):
33.Whichofthefollowingcanhelptopreventport-scanningattacks?
I.Destroyorlockupsensitiveinformation
II.Closeunusedports
III.Monitornetworkusageandinvestigatesuspiciousactivities
(a)IIandIIIonly(b)I,II,andIII(c)IandIIIonly(d)IandIIonly
34.Whichofthefollowingmustbeincludedonadigitalcertificate?
I.Thenameoftheentityandtheexpirationdate
II.Thenumberoftimesthecertificatehasbeenviewed
III.Thedigitalsignatureofthecertificateauthority
(a)I,andIII(b)IIandIIIonly(c)IandIIonly(d)I,II,andIII
35.Whichofthefollowingcanhelppreventdenialofserviceattacks?
I.Defragmentharddrivesfrequently.
II.Disableorblockanyunusednetworkservices.
(a)Ionly(b)None(c)IandII(d)IIonly
36.OneofthemostcommonapplicationsofencryptionistransmittingdatasecurelyovertheWebvia
(a)asimplesubstitutioncode(b)aTrojanhorse(c)e-mail(d)theSecureSocketLayer(SSL)
37.Whichofthefollowingcorrectlycharacterizesthepartoftheemailaddressafterthe@(the"at"sign)?
(a)TheIPaddressoftherecipient'scomputer
(b)TheWebserveroftherecipient
(c)Thecomputernameoftherecipient'scomputer
(d)Theemailservernameonwhichtherecipienthasanaccount
38.Whichofthefollowingarecommonlyusednetworktopologies?
I.Star
II.Ring
III.Modems
(a)IIandIIIonly
(b)IandIIonly
(c)IIIonly
(d)IandIIIonly
39.WhenconnectingtoanISPusingastandardphoneline,whichofthefollowingis(are)required?
I.AphonenumbertoaccesstheISP'sInternetservercomputer
II.Accountnameandpassword
III.Aninternalorexternalmodem
(a)IandIIIonly(b)IandIIonly(c)IIandIIIonly(d)I,II,andIII
40.Thebandwidthofa(n)_____signalisusuallymeasuredinbitspersecond.
(a)satellite
(b)video
(c)digital
(d)analog
二、问答题(6道题,共60分)
1.Dictionary-basedCompression(10分)
Considerthemessagebelow:
exam1,exam2,andexam3arerequiredexams.
a.Howmanybytesdoesthemessagecontain(eachcharacteri
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