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逻辑文件存放在存储介质上时，采用的组织形式是与什么有关？（）
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中级软件设计师《单项选择》真题及答案
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任何程序和数据都是以文件的形式存放在计算机的外存储器上的
在下列各题的ABCD四个选项中只有一个选项是正确的 逻辑文件存放在存储介质上时采用
逻辑文件结构
存储介质特性
主存储器管理方式
分配外设方式
以一定的组织形式存放在计算机存储介质上的相互关联的数据集合称为
数据库
数据库管理系统
编译程序
操作系统
剪贴板中信息存放在什么存储介质上关机后信息还在吗
逻辑文件存放在到存储介质上时采用的组织形式是与有关的
逻辑文件结构
存储介质特性
主存储器管理方式
分配外设方式
逻辑文件存放在存储介质上时采用的组织形式是与什么有关
逻辑文件结构
存储介质特性
主存储器管理方式
分配外设方式
打开操作是指使用一个已经存放在存储介质上的文件
逻辑文件的组织形式是由决定的
存储介质特性
操作系统的管理方式
主存容量
用户
数据文件存放在到存储介质上时采用的逻辑组织形式是与有关的
文件逻辑结构
存储介质特性
主存储器管理方式
分配外设方式
逻辑文件是的文件组织形式
在外部设备上
从用户观点看
虚拟存储
目录
逻辑文件是的文件组织形式
在外部设备上
从用户观点看
虚拟存储
目录中
数据文件存放在到存储介质上时采用的逻辑组织形式是与有关的
文件逻辑结构
存储介质特性
主存储器管理方式
分配外设方式
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Microwavecommunicationuseshigh-frequency56wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot57withthecurvatureoftheearththeycanbe58onlyovershortdistance.Thusmicrowaveisagood59forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansofdishesor60.Thesecanbeinstalledontowershighbuildingsandmountaintops.
MultipurposeInternetMailExtensionMIMEisa76documentmessagingstandardintheInternetenvironment.WithMIMEuserscansend77E-mailmessagesthatincludeaudiovideographicesandtexttoanyotheruserofaTCP/IPnetwork.Richtextinformationcanalsobe78intomessages.Itdefinesthefontsformatsand79featuresofadocumentsothedocumentcanbeeasily80onmanydifferenttypesofsystems.
41isaprotocolthatahostusestoinformarouterwhenitjoinsorleavesanInternetmulticastgroup.42isanerrordetectioncodethatmostdatacommunicationnetworksuse.43isaninteriorgatewayprotocolthatusesadistancevectoralgorithmtopropagateroutinginformation.44isatransfermodeinwhichalltypesofinformationareorganizedintofixedformcellsonanasynchronousornon-periodicbasisoverarangeofmedia.45isanidentifierofawebpage.
51isasixbytesOSIlayer2addresswhichisburnedintoeverynetworkingdevicethatprovidesitsuniqueidentityforpointtopointcommunication.52isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols.53functionswithtwolayersofprotocols.Itcanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands.54isthepopularLANdevelopedunderthedirectionoftheIEEE802.5.55isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI.
Asocketisbasicallyanendpointofacommunicationlinkbetweentwoapplications.Socketsthatextendoveranetworkconnecttwoormoreapplicationsrunningoncomputersattachedtothenetwork.Asockettwoaddresses:.Socketsprovideacommunicationchannelbetweenoneormoresystems.TherearesocketsseparatelyusingTCPandUDP.
Networkscanbeinterconnectedbydifferentdevices.Inthephysicallayernetworkscanbeconnectedby31orhubswhichjustmovethebitsfromonenetworktoanidenticalnetwork.Onelayerupwefindbridgesandswitcheswhichoperateatdatalinklayer.Theycanaccept32examinetheMACaddressandforwardtheframestoadifferentnetworkwhiledoingminorprotocoltranslationintheprocess.Innetworklayerwehaveroutersthatcanconnecttwonetworks.Iftwonetworkshave33networklayerthemutermaybeabletotranslatebetweenthepackerformats.Inthetransportlayerwefindtransportgatewaywhichcaninterfacebetweentwotransportconnections.Finallyintheapplicationlayerapplicationgatewaystranslatemessage34.AsanexamplegatewaysbetweenInternete-mailandX.400e-mailmust35thee-mailmessageandchangevariousheaderfields.
Packet-switchingwirelessnetworksarepreferable71whentransmissionsare72becauseofthewaychargesare73perpacket.Circuit-switchednetworksarepreferablefortransferringlargefilesorforotherlengthytransmissionsbecausecustomersare74forthe75oftimetheyusethenetwork.
Microwavecommunicationuseshigh-frequency56wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot57withthecurvatureoftheearththeycanbe58onlyovershortdistance.Thusmicrowaveisagood59forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansofdishesor60.Thesecanbeinstalledontowershighbuildingsandmountaintops.
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SpreadspectrumsimplymeansthatdataissentinsmallpiecesOveranumberofthe46frequenciesavailableforuseatanytimeinthespecifiedrange.Devicesusing47spreadspectrumDSSScommunicateby48eachbyteofdataintoseveralpartsandsendingthemconcurrentlyondifferent49.DSSSusesalotoftheavailable50about22megahertzMHz.
OpenShortestPathFirstOSPFisa66routingalgorithmthat67workdoneontheOSIIS-ISintradomainroutingprotocol.Thisroutingascomparedtodistance-vectorroutingrequires68processingpower.The69algorithmisusedtocalculateroutes.OSPFroutingtableupdatesonlytakeplacewhennecessary70atregularintervals.
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DOMisaplatform-andlanguage-21APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented22.DOMisa23-basedAP1todocumentswhichrequiresthewholedocumenttoberepresentedin24whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge25documentsthatdonotfitinfothememoryavailableforprocessing.
OpenShortestPathFirstOSPFisa66routingalgorithmthat67workdoneontheOSIIS-ISintradomainroutingprotocol.Thisroutingascomparedtodistance-vectorroutingrequires68processingpower.The69algorithmisusedtocalculateroutes.OSPFroutingtableupdatesonlytakeplacewhennecessary70atregularintervals.
41isaprotocolthatahostusestoinformarouterwhenitjoinsorleavesanInternetmulticastgroup.42isanerrordetectioncodethatmostdatacommunicationnetworksuse.43isaninteriorgatewayprotocolthatusesadistancevectoralgorithmtopropagateroutinginformation.44isatransfermodeinwhichalltypesofinformationareorganizedintofixedformcellsonanasynchronousornon-periodicbasisoverarangeofmedia.45isanidentifierofawebpage.
Thepurposeoftherequirementsdefinitionphaseistoproduceaclearcompleteconsistentandtestable36ofthetechnicalrequirementsforthesoftwareproduct.Duringtherequirementsdefinitionphasetherequirementsdefinitionteamusesaninterativeprocesstoexpandabroadstatementofthesystemrequirementsintoacompleteanddetailedspecificationofeachfunctionthatthesoftwaremustperformandeach37thatitmustmeet.Thestartingpointisusuallyasetofhighlevelrequirementsfromthe38thatdescribetheprojectorproblem.Ineithercasetherequirementsdefinitionteamformulatesanoverallconceptfor’thesystemandthendefines39showinghowthesystemwillbeoperatedpublishesthesystemandoperationsconceptdocumentandconductsasystemconceptreviewSCR.FollowingtheSCRtheteamderives40requirementsforthesystemfromthehighlevelrequirementsandthesystemandoperationsconceptusingstructuredorobject-orientedanalysis.Theteamspecifiesthesoftwarefunctionsandalgorithmsneededtosatisfyeachdetailedrequirement.
Networkscanbeinterconnectedbydifferentdevices.Inthephysicallayernetworkscanbeconnectedby31orhubswhichjustmovethebitsfromonenetworktoanidenticalnetwork.Onelayerupwefindbridgesandswitcheswhichoperateatdatalinklayer.Theycanaccept32examinetheMACaddressandforwardtheframestoadifferentnetworkwhiledoingminorprotocoltranslationintheprocess.Innetworklayerwehaveroutersthatcanconnecttwonetworks.Iftwonetworkshave33networklayerthemutermaybeabletotranslatebetweenthepackerformats.Inthetransportlayerwefindtransportgatewaywhichcaninterfacebetweentwotransportconnections.Finallyintheapplicationlayerapplicationgatewaystranslatemessage34.AsanexamplegatewaysbetweenInternete-mailandX.400e-mailmust35thee-mailmessageandchangevariousheaderfields.
Asocketisbasicallyanendpointofacommunicationlinkbetweentwoapplications.Socketsthatextendoveranetworkconnecttwoormoreapplicationsrunningoncomputersattachedtothenetwork.Asockettwoaddresses:.Socketsprovideacommunicationchannelbetweenoneormoresystems.TherearesocketsseparatelyusingTCPandUDP.
Microwavecommunicationuseshigh-frequency56wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot57withthecurvatureoftheearththeycanbe58onlyovershortdistance.Thusmicrowaveisagood59forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansofdishesor60.Thesecanbeinstalledontowershighbuildingsandmountaintops.
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MultipurposeInternetMailExtensionMIMEisa76documentmessagingstandardintheInternetenvironment.WithMIMEuserscansend77E-mailmessagesthatincludeaudiovideographicesandtexttoanyotheruserofaTCP/IPnetwork.Richtextinformationcanalsobe78intomessages.Itdefinesthefontsformatsand79featuresofadocumentsothedocumentcanbeeasily80onmanydifferenttypesofsystems.
OpenShortestPathFirstOSPFisa66routingalgorithmthat67workdoneontheOSIIS-ISintradomainroutingprotocol.Thisroutingascomparedtodistance-vectorroutingrequires68processingpower.The69algorithmisusedtocalculateroutes.OSPFroutingtableupdatesonlytakeplacewhennecessary70atregularintervals.
51isasixbytesOSIlayer2addresswhichisburnedintoeverynetworkingdevicethatprovidesitsuniqueidentityforpointtopointcommunication.52isaprofessionalorganizationofindividualsinmultipleprofessionswhichfocusesoneffortonlower-layerprotocols.53functionswithtwolayersofprotocols.Itcanconnectnetworksofdifferentspeedsandcanbeadaptedtoanenvironmentasitexpands.54isthepopularLANdevelopedunderthedirectionoftheIEEE802.5.55isthepopularbackbonetechnologyfortransmittinginformationathighspeedwithahighleveloffaulttolerancewhichisdevelopedunderthedirectionofANSI.
MultipurposeInternetMailExtensionMIMEisa76documentmessagingstandardintheInternetenvironment.WithMIMEuserscansend77E-mailmessagesthatincludeaudiovideographicesandtexttoanyotheruserofaTCP/IPnetwork.Richtextinformationcanalsobe78intomessages.Itdefinesthefontsformatsand79featuresofadocumentsothedocumentcanbeeasily80onmanydifferenttypesofsystems.
SpreadspectrumsimplymeansthatdataissentinsmallpiecesOveranumberofthe46frequenciesavailableforuseatanytimeinthespecifiedrange.Devicesusing47spreadspectrumDSSScommunicateby48eachbyteofdataintoseveralpartsandsendingthemconcurrentlyondifferent49.DSSSusesalotoftheavailable50about22megahertzMHz.
Thepurposeoftherequirementsdefinitionphaseistoproduceaclearcompleteconsistentandtestable36ofthetechnicalrequirementsforthesoftwareproduct.Duringtherequirementsdefinitionphasetherequirementsdefinitionteamusesaninterativeprocesstoexpandabroadstatementofthesystemrequirementsintoacompleteanddetailedspecificationofeachfunctionthatthesoftwaremustperformandeach37thatitmustmeet.Thestartingpointisusuallyasetofhighlevelrequirementsfromthe38thatdescribetheprojectorproblem.Ineithercasetherequirementsdefinitionteamformulatesanoverallconceptfor’thesystemandthendefines39showinghowthesystemwillbeoperatedpublishesthesystemandoperationsconceptdocumentandconductsasystemconceptreviewSCR.FollowingtheSCRtheteamderives40requirementsforthesystemfromthehighlevelrequirementsandthesystemandoperationsconceptusingstructuredorobject-orientedanalysis.Theteamspecifiesthesoftwarefunctionsandalgorithmsneededtosatisfyeachdetailedrequirement.
DOMisaplatform-andlanguage-21APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented22.DOMisa23-basedAP1todocumentswhichrequiresthewholedocumenttoberepresentedin24whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge25documentsthatdonotfitinfothememoryavailableforprocessing.
Thepurposeoftherequirementsdefinitionphaseistoproduceaclearcompleteconsistentandtestable36ofthetechnicalrequirementsforthesoftwareproduct.Duringtherequirementsdefinitionphasetherequirementsdefinitionteamusesaninterativeprocesstoexpandabroadstatementofthesystemrequirementsintoacompleteanddetailedspecificationofeachfunctionthatthesoftwaremustperformandeach37thatitmustmeet.Thestartingpointisusuallyasetofhighlevelrequirementsfromthe38thatdescribetheprojectorproblem.Ineithercasetherequirementsdefinitionteamformulatesanoverallconceptfor’thesystemandthendefines39showinghowthesystemwillbeoperatedpublishesthesystemandoperationsconceptdocumentandconductsasystemconceptreviewSCR.FollowingtheSCRtheteamderives40requirementsforthesystemfromthehighlevelrequirementsandthesystemandoperationsconceptusingstructuredorobject-orientedanalysis.Theteamspecifiesthesoftwarefunctionsandalgorithmsneededtosatisfyeachdetailedrequirement.
MelissaandLoveLettermadeuseofthetrustthatexistsbetweenfriendsorcolleagues.Imaginereceivingan26fromafriendwhoasksyoutoopenit.ThisiswhathappenswithMelissaandseveralothersimilaremail27.Uponrunningsuchwormsusuallyproceedtosendthemselvesouttoemailaddressesfromthevictim’saddressbookpreviousemailswebpages28.Asadministratorsseektoblockdangerousemailattachmentsthroughtherecognitionofwell-known29viruswritersuseotherextensionstocircumventsuchprotection.Executable.exefilesarerenamedto.batand.cmdplusawholelistofotherextensionsandwillstillrunandsuccessfullyinfecttargetusers.Frequentlyhackerstrytopenetratenetworksbysendinganattachmentthatlookslikeaflashmoviewhichwhiledisplayingsomecuteanimationsimultaneouslyrunscommandsinthebackgroundtostealyourpasswordsandgivethe30accesstoyournetwork.
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