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管道命令的作用是允许数据流从较低安全级别的接口流向较高安全级别的接口。解释或完成以下配置命令。 firewall(config)#conduit permit tcp host 61.144.51....
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CiscoPIX525防火墙用于允许数据流从具有较低安全级别的接口流向具有较高安全级别的接口的配置命
global
conduit
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nat
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CiscoPIX525防火墙用来允许数据流从具有较低安全级接口流向较高安全级接VJ的配置命令是
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在Windows操作系统下通过运行______命令可以打开Windows管理控制台
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BorderGatewayProtocolBGPisinter-autonomoussystem96protocol.BGPisbasedonaroutingmethodcalledpathvectorrouting.Distancevectorroutingisnotagoodcandidateforinter-autonomoussystemroutingbecausethereareoccasionsonwhichtheroutewiththesmallest97countisnotthepreferredroute.Forexamplewemaynotwantapacketthroughannotsecureeventhoughitistheshortestroute.Alsodistancevectorroutingisunstableduetothefactthattheroutersannounceonlythenumberofhopcountstothedestinationwithoutactuallydefiningthepaththatleadstothat98.Arouterthatreceivesadistancevectoradvertisementpacketmaybefoolediftheshortestpathisactuallycalculatedthroughthereceivingrouteritself.Link99routingisalsonotagoodcandidateforinter-autonomoussystemroutingbecauseanInternetisusuallytoobigforthisroutingmethod.Touselinkstateroutingforthewholeinternetwouldrequireeachroutertohaveahugelinkstatedatabase.Itwouldalsotakealongtimeforeachroutertocalculateitsrousting100usingtheDijkstraalgorism. 98是
Routingprotocolsusedifferenttechniquesforassigning81toindividualnetworks.Furthereachroutingprotocolformsametricaggregationinadifferentway.Mostroutingprotocolscanusemultiplepathsifthepathshaveanequal82.Someroutingprotocolscanevenusemultiplepathswhenpathshaveanunequalcost.Ineithercaseload83canimproveoverallallocationofnetworkbandwidth.Whenmultiplepathsareusedthereareseveralwaystodistributethepackets.Thetwomostcommonmechanismsareper-packetloadbalancingandper-destinationloadbalancing.Per-packetloadbalancingdistributesthe84acrossthepossibleroutesinamannerproportionaltotheroutemetrics.Per-destinationloadbalancingdistributespacketsacrossthepossibleroutesbasedon85. 84是
Althoughagivenwaveformmaycontainfrequenciesoveraverybroadrangeasapracticalmatteranytransmissionsystemwillbeabletoaccommodateonlyalimitedbandof86.Thisinturnlimitsthedataratethatcanbecarriedonthetransmission87Asquarewavehasaninfinitenumberoffrequencycomponentsandhenceaninfinite88Howeverthepeakamplitudeofthekthfrequencycomponentkfisonlyl/ksomostofthe89inthiswaveformisinthefirstfewfrequencycomponents.Ingeneralanydigitalwaveformwillhave90bandwidth.Ifweattempttotransmitthiswaveformasasignaloveranymediumthetransmissionsystemwilllimitthebandwidththatcanbetransmitted. 86处是
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Althoughagivenwaveformmaycontainfrequenciesoveraverybroadrangeasapracticalmatteranytransmissionsystemwillbeabletoaccommodateonlyalimitedbandof86.Thisinturnlimitsthedataratethatcanbecarriedonthetransmission87Asquarewavehasaninfinitenumberoffrequencycomponentsandhenceaninfinite88Howeverthepeakamplitudeofthekthfrequencycomponentkfisonlyl/ksomostofthe89inthiswaveformisinthefirstfewfrequencycomponents.Ingeneralanydigitalwaveformwillhave90bandwidth.Ifweattempttotransmitthiswaveformasasignaloveranymediumthetransmissionsystemwilllimitthebandwidththatcanbetransmitted. 88是
NAC’sNetworkAccessControlroleistorestrictnetworkaccesstoonlycompliantendpointsand66users.HoweverNACisnotacompleteLAN67solution;additionalproactiveand68securitymeasuresmustbeimplemented.NevisisthefirstandonlycomprehensiveLANsecuritysolutionthatcombinesdeepsecurityprocessingofeverypacketat100Gbpsensuringahighlevelofsecurityplusapplicationavailabilityandperformance.NevisintegratesNACasthefirstlineofLANsecurity69InadditiontoNACenterprisesneedtoimplementrole-basednetworkaccesscontrolaswellascriticalproactivesecuritymeasures-real-timemultilevel70inspectionandmicrosecondthreatcontainment. 68是
某网络结构如图6-3所示在Windows操作系统中Server1通过安装51组件创建Web站点PC1的用户在浏览器地址栏中输入www.abc.com后无法获取响应页面管理人员在Windows操作系统下可以使用52判断故障发生在网络A内还是网络A外如果使用ping61.102.58.77命令对服务器Server1进行测试响应正常则可能出现的问题是53 51为
某网络结构如图6-3所示在Windows操作系统中Server1通过安装51组件创建Web站点PC1的用户在浏览器地址栏中输入www.abc.com后无法获取响应页面管理人员在Windows操作系统下可以使用52判断故障发生在网络A内还是网络A外如果使用ping61.102.58.77命令对服务器Server1进行测试响应正常则可能出现的问题是53 53为
若在Windows运行窗口中输入______命令可以查看和修改注册表
Inthefollowingessayeachblankhasfourchoices.Choosethebestanswerandwritedownontheanswersheet. Microwavecommunicationuseshigh-frequency26wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot27withthecurvatureoftheearththeycanbe28onlyovershortdistance.Thusmicrowaveisagood29forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansof"dishes"or30.Thesecanbeinstalledontowershighbuildingsandmountaintops. 26是
BorderGatewayProtocolBGPisinter-autonomoussystem96protocol.BGPisbasedonaroutingmethodcalledpathvectorrouting.Distancevectorroutingisnotagoodcandidateforinter-autonomoussystemroutingbecausethereareoccasionsonwhichtheroutewiththesmallest97countisnotthepreferredroute.Forexamplewemaynotwantapacketthroughannotsecureeventhoughitistheshortestroute.Alsodistancevectorroutingisunstableduetothefactthattheroutersannounceonlythenumberofhopcountstothedestinationwithoutactuallydefiningthepaththatleadstothat98.Arouterthatreceivesadistancevectoradvertisementpacketmaybefoolediftheshortestpathisactuallycalculatedthroughthereceivingrouteritself.Link99routingisalsonotagoodcandidateforinter-autonomoussystemroutingbecauseanInternetisusuallytoobigforthisroutingmethod.Touselinkstateroutingforthewholeinternetwouldrequireeachroutertohaveahugelinkstatedatabase.Itwouldalsotakealongtimeforeachroutertocalculateitsrousting100usingtheDijkstraalgorism. 96是
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DOMisaplatform-andlanguage-41APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented42.DOMisa43-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin44whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge.45documentsthatdonotfitinfothememoryavailableforprocessing. 44是
Inthefollowingessayeachblankhasfourchoices.Choosethebestanswerandwritedownontheanswersheet. Microwavecommunicationuseshigh-frequency26wavesthattravelinstraightlinesthroughtheair.Becausethewavescannot27withthecurvatureoftheearththeycanbe28onlyovershortdistance.Thusmicrowaveisagood29forsendingdatabetweenbuildingsinacityoronalargecollegecampus.Forlongerdistancesthewavesmustberelayedbymeansof"dishes"or30.Thesecanbeinstalledontowershighbuildingsandmountaintops. 28是
Routingprotocolsusedifferenttechniquesforassigning81toindividualnetworks.Furthereachroutingprotocolformsametricaggregationinadifferentway.Mostroutingprotocolscanusemultiplepathsifthepathshaveanequal82.Someroutingprotocolscanevenusemultiplepathswhenpathshaveanunequalcost.Ineithercaseload83canimproveoverallallocationofnetworkbandwidth.Whenmultiplepathsareusedthereareseveralwaystodistributethepackets.Thetwomostcommonmechanismsareper-packetloadbalancingandper-destinationloadbalancing.Per-packetloadbalancingdistributesthe84acrossthepossibleroutesinamannerproportionaltotheroutemetrics.Per-destinationloadbalancingdistributespacketsacrossthepossibleroutesbasedon85. 82是
DOMisaplatform-andlanguage-41APIthatallowsprogramsandscriptstodynamicallyaccessandupdatethecontentstructureandstyleofWWWdocumentscurrentlydefinitionsforHTMLandXMLdocumentsarepartofthespecification.Thedocumentcanbefurtherprocessedandtheresultsofthatprocessingcanbeincorporatedbackintothepresented42.DOMisa43-basedAPItodocumentswhichrequiresthewholedocumenttoberepresentedin44whileprocessingit.AsimpleralternativetoDOMistheevent-basedSAXwhichcanbeusedtoprocessverylarge.45documentsthatdonotfitinfothememoryavailableforprocessing. 42是
Althoughagivenwaveformmaycontainfrequenciesoveraverybroadrangeasapracticalmatteranytransmissionsystemwillbeabletoaccommodateonlyalimitedbandof86.Thisinturnlimitsthedataratethatcanbecarriedonthetransmission87Asquarewavehasaninfinitenumberoffrequencycomponentsandhenceaninfinite88Howeverthepeakamplitudeofthekthfrequencycomponentkfisonlyl/ksomostofthe89inthiswaveformisinthefirstfewfrequencycomponents.Ingeneralanydigitalwaveformwillhave90bandwidth.Ifweattempttotransmitthiswaveformasasignaloveranymediumthetransmissionsystemwilllimitthebandwidththatcanbetransmitted. 90是
NAC’sNetworkAccessControlroleistorestrictnetworkaccesstoonlycompliantendpointsand66users.HoweverNACisnotacompleteLAN67solution;additionalproactiveand68securitymeasuresmustbeimplemented.NevisisthefirstandonlycomprehensiveLANsecuritysolutionthatcombinesdeepsecurityprocessingofeverypacketat100Gbpsensuringahighlevelofsecurityplusapplicationavailabilityandperformance.NevisintegratesNACasthefirstlineofLANsecurity69InadditiontoNACenterprisesneedtoimplementrole-basednetworkaccesscontrolaswellascriticalproactivesecuritymeasures-real-timemultilevel70inspectionandmicrosecondthreatcontainment. 66是
TheBorderGatewayProtocolBGPisaninterautonomoussystem76protocol.TheprimaryfunctionofaBGPspeakingsystemistoexchangenetwork77informationwithotherBGPsystem.ThisnetworkreachabilityinformationincludesinformationonthelistofAutonomousSystemASsthatreachabilityinformationtraverses.BGP-4providesanewsetofmechanismsforsupporting78interdomainrouting.ThesemechanismsincludesupportforadvertisinganIP79andeliminatetheconceptofnetworkclasswithinBGRBGP-4alsointroducesmechanismsthatallowaggregationofroutesincluding.80ofASpaths.Thesechangesprovidesupportfortheproposedsupernetttingscheme. 77是
TheBorderGatewayProtocolBGPisaninterautonomoussystem76protocol.TheprimaryfunctionofaBGPspeakingsystemistoexchangenetwork77informationwithotherBGPsystem.ThisnetworkreachabilityinformationincludesinformationonthelistofAutonomousSystemASsthatreachabilityinformationtraverses.BGP-4providesanewsetofmechanismsforsupporting78interdomainrouting.ThesemechanismsincludesupportforadvertisinganIP79andeliminatetheconceptofnetworkclasswithinBGRBGP-4alsointroducesmechanismsthatallowaggregationofroutesincluding.80ofASpaths.Thesechangesprovidesupportfortheproposedsupernetttingscheme. 79是
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