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HTFP是WWW的核心，它是一个（）协议，当访问一个URL为http：//www.ccidedu.com.cn/index.htm的网页时，浏览器首先向（）请求解析http：//www.ccid...
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HTTP是WWW的核心它是一个16协议当访问一个URL为http://www.csai.cn/ind
TCP
IP
HTTP
UDP
HTFP是WWW的核心它是一个协议当访问一个URL为http//www.ccidedu.com
GET
POST
REQUST
SET
HTTP是WWW的核心它是一个31协议当访问一个URL为http//www.ccidedu.c
网关
DNS
ISP
Web服务器
访问www网时使用的应用层协议为______
HTML
HTFP
FTP
SMTP
HTTP是WWW的核心它是一个31协议当访问一个URL为http//www.ccidedu.c
80
23
25
21
HTTP协议是常用的应用层协议它通过25协议提供服务上下层协议默认时使用26端口进行服务识别H
同一个
顺序的
有关的
无关的
使用历史和书签是WWW浏览器的基本功能历史命令用于记录一个用户最新访问过的【8】
HTTP是WWW的核心它是一个31协议当访问一个URL为http//www.ccidedu.c
面向事务的客户
面向对象的服务器
面向事务的客户服务器
面向对象的客户服务器
PPPoE协议的核心仍是所以发现阶段的主要作用是从多点访问的以太网结构中挑选出一个服务器并建立
HTFP是WWW的核心它是一个协议当访问一个URL为http//www.ccidedu.com
80
23
25
21
HTFP是WWW的核心它是一个协议当访问一个URL为http//www.ccidedu.com
TCP
IP
HTFP
UDP
HTTP是WWW的核心它是一个31协议当访问一个URL为http//www.ccidedu.c
GET
POST
REQUST
SET
HTFP是WWW的核心它是一个协议当访问一个URL为http//www.ccidedu.com
面向事务的客户
面向对象的服务器
面向事务的客户服务器
面向对象的客户服务器
实现选择运算的最直接的方法是______扫描即依次访问表的每一个块对于块中的每一个元组测试它是否满足
HTTP是WWW的核心它是一个16协议当访问一个URL为http://www.csai.cn/ind
面向事务的客户
面向对象的服务器
面向事务的客户服务器
面向对象的客户服务器
HTTP是WWW的核心它是一个16协议当访问一个URL为http://www.csai.cn/ind
GET
POST
REQUST
SET
HTTP是WWW的核心它是一个31协议当访问一个URL为http//www.ccidedu.c
TCP
IP
HTTP
UDP
HTTP是WWW的核心它是一个16协议当访问一个URL为http://www.csai.cn/ind
80
23
25
21
从一个或多个基本表导出的表是一个【5】它是一个虚表
HTTP是WWW的核心它是一个16协议当访问一个URL为http://www.csai.cn/ind
网关
DNS
ISP
Web服务器
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Atransportlayerprotocolusuallyhasseveralresponsibilties.Oneistocreateaprocess-to-processcommunicationUDPuses1numberstoaccomplishthis.AnotherresponsibilityistoprovidecontrolmechanismsatthetransportlevelUDPdoesthistaskataveryminimallevel.Thereisnoflowcontrolmechanismandthereisno2forreceivedpacket.UDPhoweverdoesprovideerrorcontroltosomeextent.IfUDPdetectsanerrorinthereceivedpacketitwillsilentlydropit. Thetransportlayeralsoprovidesaconnectionmechanismfortheprocesses.The3mustbeabletosendstreamsofdatatothetransportlayer.Itistheresponsibilityofthetransportlayerat4stationtomaketheconnectionwiththereceiverchopthestreamintotransportableunitsnumberthemandsendthemonebyone.itistheresponsibilityofthetransportlayeratthereceivingendtowaituntilallthedifferentunitsbelongingtothesameprocesshavearrivedcheckandpassthosethatare5freeanddeliverthemtothereceivingprocessasastream. 3是
以下关于网络安全设计原则的说法错误的是
BorderGatewayProtocolBGPisinter-autonomoussystem1protocol.BGPisbasedonaroutingmethodcalledpathvectorrouting.Distancevectorroutingisnotagoodcandidateforinter-autonomoussystemroutingbecausethereareoccasionsonwhichtheroutewiththesmallest2countisnotthepreferredroute.Forexamplewemaynotwantapacketthroughanautonomoussystemthatisnotsecureeventhoughitisshortestroute.Alsodistancevectorroutingisunstableduetothefactthattheroutersannounceonlythenumberofhopcountstothedestinationwithoutdefiningthepaththatleadstothat3Arouterthatreceivesadistancevectoradvertisementpacketmaybefoolediftheshortestpathisactuallycalculatedthroughthereceivingrouteritself.Link4.routingisalsonotagoodcandidateforinner-autonomoussystemroutingbecauseaninternetisusuallytoobigforthisroutingmethod.Touselinkstateroutingforthewholeinternetwouldrequireeachroutertohaveahugelinkstatedatabase.Itwouldalsotakealongtimeforeachroutertocalculateitsrouting5usingtheDijkstraalgorism. 4是
Themetricassignedtoeachnetworkdependsonthetypeofprotocol.SomesimpleprotocollikeRIPtreatseachnetworkasequals.The1ofpassingthrougheachnetworkisthesame;itisone2count.Soifapacketpassesthrough10networktoreachthedestinationthetotalcostis10hopcounts.OtherprotocolssuchasOSPFallowtheadministratortoassignacostforpassingthroughanetworkbasedonthetypeofservicerequired.A 3throughanetworkcanhavedifferentcostsmetrics.Forexampleifmaximum4isthedesiredtypeofserviceasatellitelinkhasalowermetricthanafiber-opticline.Ontheotherhandifminimum5isthedesiredtypeofserviceafiber-opticlinehasalowermetricthanasatelliteline.OSPFalloweachroutertohaveseveralroutingtablebasedontherequiredtypeofService. 1是
ThedefactostandardapplicationprograminterfaceAPIforTCP/IPapplicationsisthe"sockets"interface.AlthoughthisAPIwasdevelopedfor1intheearly1980s.ithasalsobeenimplementedonawidevarietyofnon-Unixsystems.TCP/IP2writtenusingthesocketsAPIhaveinthepastenjoyedahighdegreeofportabilityandwewouldlikethesame3withIPv6applications.ButchangesarerequiredtothesocketsAPItosupportIPv6andthismemodescribesthesechanges.TheseincludeanewsocketaddressstructuretocarryIPv64newaddressconversionfunctionsandsomenewsocketoptions.TheseextensionsaredesignedtoprovideAccesstothebasicIPv6featuresrequiredbyTCPandUDPapplicationsincludingmulticastingwhileintroducingaminimumofchangeintothesystemandprovidingcomplete5forexistingIPv4applications. 4是
TheTCPprotocolisa1layerprotocol.EachconnectionconnectstwoTCPsthatmaybejustonephysicalnetworkapartorlocatedonoppositesidesoftheglobe.Inotherwordseachconnectioncreatesa 2withalengththatmaybetotallydifferentfromanotherpathcreatedbyanotherconnection.ThismeansthatTCPcannotusethesameretransmissiontimeforallconnections.Selectingafixedretransnussiontimeforallconnectionscanresultinseriousconsequences.Iftheretransmissiontimedoesnotallowenoughtimefora 3toreachthedestinationandanacknowledgmenttoreachthesourceitcanresultinretransmissionofsegmentsthatarestillontheway.Converselyiftheretransmissiontimeislongerthannecessaryforashortpathitmayresultindelayfortheapplicationprograms.Evenforonesingleconnectiontheretransmissiontimeshouldnotbefixed.Aconnectionmaybeabletosendsegmentsandreceive 4fasterduringnontrafficperiodthanduringcongestedperiods.TCPusesthedynamicretransmissiontimeatransmissiontimeisdifferentforeachconnectionandwhichmaybechangedduringthesameconnection.Retransmissiontimecanbemade5bybasingitontheround-triptimeRTT.Severalformulasareusedforthispurpose. 1是
Themetricassignedtoeachnetworkdependsonthetypeofprotocol.SomesimpleprotocollikeRIPtreatseachnetworkasequals.The1ofpassingthrougheachnetworkisthesame;itisone2count.Soifapacketpassesthrough10networktoreachthedestinationthetotalcostis10hopcounts.OtherprotocolssuchasOSPFallowtheadministratortoassignacostforpassingthroughanetworkbasedonthetypeofservicerequired.A3throughanetworkcanhavedifferentcostsmetrics.Forexampleifmaximum4isthedesiredtypeofserviceasatellitelinkhasalowermetricthanafiber-opticline.Ontheotherhandifminimum5isthedesiredtypeofserviceafiber-opticlinehasalowermetricthanasatelliteline.OSPFalloweachroutertohaveseveralroutingtablebasedontherequiredtypeofService. 5是
Atransportlayerprotocolusuallyhasseveralresponsibilties.Oneistocreateaprocess-to-processcommunicationUDPuses1numberstoaccomplishthis.AnotherresponsibilityistoprovidecontrolmechanismsatthetransportlevelUDPdoesthistaskataveryminimallevel.Thereisnoflowcontrolmechanismandthereisno2forreceivedpacket.UDPhoweverdoesprovideerrorcontroltosomeextent.IfUDPdetectsanerrorinthereceivedpacketitwillsilentlydropit. Thetransportlayeralsoprovidesaconnectionmechanismfortheprocesses.The3mustbeabletosendstreamsofdatatothetransportlayer.Itistheresponsibilityofthetransportlayerat4stationtomaketheconnectionwiththereceiverchopthestreamintotransportableunitsnumberthemandsendthemonebyone.itistheresponsibilityofthetransportlayeratthereceivingendtowaituntilallthedifferentunitsbelongingtothesameprocesshavearrivedcheckandpassthosethatare5freeanddeliverthemtothereceivingprocessasastream. 5是
InClanguagethereareseveralmethodsofcommunicatingdatabetweenfunctionsoneofwhichisby
TheTCPprotocolisa1layerprotocol.EachconnectionconnectstwoTCPsthatmaybejustonephysicalnetworkapartorlocatedonoppositesidesoftheglobe.Inotherwordseachconnectioncreatesa2withalengththatmaybetotallydifferentfromanotherpathcreatedbyanotherconnection.ThismeansthatTCPcannotusethesameretransmissiontimeforallconnections.Selectingafixedretransnussiontimeforallconnectionscanresultinseriousconsequences.Iftheretransmissiontimedoesnotallowenoughtimefora3toreachthedestinationandanacknowledgmenttoreachthesourceitcanresultinretransmissionofsegmentsthatarestillontheway.Converselyiftheretransmissiontimeislongerthannecessaryforashortpathitmayresultindelayfortheapplicationprograms.Evenforonesingleconnectiontheretransmissiontimeshouldnotbefixed.Aconnectionmaybeabletosendsegmentsandreceive4fasterduringnontrafficperiodthanduringcongestedperiods.TCPusesthedynamicretransmissiontimeatransmissiontimeisdifferentforeachconnectionandwhichmaybechangedduringthesameconnection.Retransmissiontimecanbemade5bybasingitontheround-triptimeRTT.Severalformulasareusedforthispurpose. 5是
由多个源文件组成的C程序经过编辑预处理编译链接等阶段才能生成最终的可执行程序此过程中在阶段可以发现被调用的函数未定义
Themetricassignedtoeachnetworkdependsonthetypeofprotocol.SomesimpleprotocollikeRIPtreatseachnetworkasequals.The1ofpassingthrougheachnetworkisthesame;itisone2count.Soifapacketpassesthrough10networktoreachthedestinationthetotalcostis10hopcounts.OtherprotocolssuchasOSPFallowtheadministratortoassignacostforpassingthroughanetworkbasedonthetypeofservicerequired.A3throughanetworkcanhavedifferentcostsmetrics.Forexampleifmaximum4isthedesiredtypeofserviceasatellitelinkhasalowermetricthanafiber-opticline.Ontheotherhandifminimum5isthedesiredtypeofserviceafiber-opticlinehasalowermetricthanasatelliteline.OSPFalloweachroutertohaveseveralroutingtablebasedontherequiredtypeofService. 3是
Althoughagivenwaveformmaycontainfrequenciesoveraverybroadrangeasapracticalmatteranytransmissionsystemwillbeabletoaccommodateonlyalimitedbandof1.Thisinturnlimitsthedataratethatcanbecarriedonthetransmission2.Asquarewavehasaninfinitenumberoffrequencycomponentsandhenceaninfinite3.Howeverthepeakamplitudeofthekthfrequencycomponentkfisonlyl/ksomostofthe4inthiswaveformisinthefirstfewfrequencycomponents.Ingeneralanydigitalwaveformwillhave5bandwidth.Ifweattempttotransmitthiswaveformasasignaloveranymediumthetransmissionsystemwilllimitthebandwidththatcanbetransmitted. 4是
有关集成测试的描述中______是错误的
TCP/IP在多个层次引入了安全机制其中TLS协议位于
TraditionalIPpacketforwardinganalyzesthe1IPaddresscontainedinthenetworklayerheaderofeachpacketasthepackettravelsfromitssourcetoitsfinaldestination.ArouteranalyzesthedestinationIPaddressindependentlyateachhopinthenetwork.Dynamic2protocolsorstaticconfigurationbuildsthedatabaseneededtoanalyzethedestinationIPaddresstheroutingtable.TheprocessofimplementingtraditionalIProutingalsoiscalledhop-by-hopdestination-based3routing.Althoughsuccessfulandobviouslywidelydeployedcertainrestrictionswhichhavebeenrealizedforsometimeexistforthismethodofpacketforwardingthatdiminishits4.NewtechniquesarethereforerequiredtoaddressandexpandthefunctionalityofanIP-basednetworkinfrastructure.Thisfirstchapterconcentrateonidentifyingtheserestrictionsandpresentsanewarchitectureknownasmultipleprotocol5switchingthatprovidessolutionstosomeoftheserestrictions. 3是
要想成功地运转数据库就要在数据处理部门配备______
SNMP采用UDP提供的数据报服务传递信息这是由于______
TheTCPprotocolisa1layerprotocol.EachconnectionconnectstwoTCPsthatmaybejustonephysicalnetworkapartorlocatedonoppositesidesoftheglobe.Inotherwordseachconnectioncreatesa2withalengththatmaybetotallydifferentfromanotherpathcreatedbyanotherconnection.ThismeansthatTCPcannotusethesameretransmissiontimeforallconnections.Selectingafixedretransnussiontimeforallconnectionscanresultinseriousconsequences.Iftheretransmissiontimedoesnotallowenoughtimefora3toreachthedestinationandanacknowledgmenttoreachthesourceitcanresultinretransmissionofsegmentsthatarestillontheway.Converselyiftheretransmissiontimeislongerthannecessaryforashortpathitmayresultindelayfortheapplicationprograms.Evenforonesingleconnectiontheretransmissiontimeshouldnotbefixed.Aconnectionmaybeabletosendsegmentsandreceive4fasterduringnontrafficperiodthanduringcongestedperiods.TCPusesthedynamicretransmissiontimeatransmissiontimeisdifferentforeachconnectionandwhichmaybechangedduringthesameconnection.Retransmissiontimecanbemade5bybasingitontheround-triptimeRTT.Severalformulasareusedforthispurpose. 3是
PC机不能接入因特网这时采用抓包工具捕获的以太网接口发出的信息如下图所示 可以看出该PC机的IP地址为1默认网关的IP地址为2PC不能接入Internet的原因可能是3 1处填
甲软件公司将其开发的商业软件著作权经约定合法转让给乙股份有限公司随后自行对原软件作品提高和改善形成新版本后进行销售甲软件公司的行为______
TraditionalIPpacketforwardinganalyzesthe1IPaddresscontainedinthenetworklayerheaderofeachpacketasthepackettravelsfromitssourcetoitsfinaldestination.ArouteranalyzesthedestinationIPaddressindependentlyateachhopinthenetwork.Dynamic2protocolsorstaticconfigurationbuildsthedatabaseneededtoanalyzethedestinationIPaddresstheroutingtable.TheprocessofimplementingtraditionalIProutingalsoiscalledhop-by-hopdestination-based3routing.Althoughsuccessfulandobviouslywidelydeployedcertainrestrictionswhichhavebeenrealizedforsometimeexistforthismethodofpacketforwardingthatdiminishits4.NewtechniquesarethereforerequiredtoaddressandexpandthefunctionalityofanIP-basednetworkinfrastructure.Thisfirstchapterconcentrateonidentifyingtheserestrictionsandpresentsanewarchitectureknownasmultipleprotocol5switchingthatprovidessolutionstosomeoftheserestrictions. 5是
ThedefactostandardapplicationprograminterfaceAPIforTCP/IPapplicationsisthe"sockets"interface.AlthoughthisAPIwasdevelopedfor1intheearly1980s.ithasalsobeenimplementedonawidevarietyofnon-Unixsystems.TCP/IP2writtenusingthesocketsAPIhaveinthepastenjoyedahighdegreeofportabilityandwewouldlikethesame3withIPv6applications.ButchangesarerequiredtothesocketsAPItosupportIPv6andthismemodescribesthesechanges.TheseincludeanewsocketaddressstructuretocarryIPv64newaddressconversionfunctionsandsomenewsocketoptions.TheseextensionsaredesignedtoprovideAccesstothebasicIPv6featuresrequiredbyTCPandUDPapplicationsincludingmulticastingwhileintroducingaminimumofchangeintothesystemandprovidingcomplete5forexistingIPv4applications. 2是
两个主机通过电缆直接相连主机A的IP地址为220.17.33.24/28而主机B的IP地址为220.17.33.100/28两个主机互相ping不通这时应该______
Atransportlayerprotocolusuallyhasseveralresponsibilties.Oneistocreateaprocess-to-processcommunicationUDPuses1numberstoaccomplishthis.AnotherresponsibilityistoprovidecontrolmechanismsatthetransportlevelUDPdoesthistaskataveryminimallevel.Thereisnoflowcontrolmechanismandthereisno2forreceivedpacket.UDPhoweverdoesprovideerrorcontroltosomeextent.IfUDPdetectsanerrorinthereceivedpacketitwillsilentlydropit. Thetransportlayeralsoprovidesaconnectionmechanismfortheprocesses.The3mustbeabletosendstreamsofdatatothetransportlayer.Itistheresponsibilityofthetransportlayerat4stationtomaketheconnectionwiththereceiverchopthestreamintotransportableunitsnumberthemandsendthemonebyone.itistheresponsibilityofthetransportlayeratthereceivingendtowaituntilallthedifferentunitsbelongingtothesameprocesshavearrivedcheckandpassthosethatare 5freeanddeliverthemtothereceivingprocessasastream. 1是
信息是客观世界各种事物变化和特征的反映下述说法正确的是
BorderGatewayProtocolBGPisinter-autonomoussystem1protocol.BGPisbasedonaroutingmethodcalledpathvectorrouting.Distancevectorroutingisnotagoodcandidateforinter-autonomoussystemroutingbecausethereareoccasionsonwhichtheroutewiththesmallest2countisnotthepreferredroute.Forexamplewemaynotwantapacketthroughanautonomoussystemthatisnotsecureeventhoughitisshortestroute.Alsodistancevectorroutingisunstableduetothefactthattheroutersannounceonlythenumberofhopcountstothedestinationwithoutdefiningthepaththatleadstothat3Arouterthatreceivesadistancevectoradvertisementpacketmaybefoolediftheshortestpathisactuallycalculatedthroughthereceivingrouteritself.Link4.routingisalsonotagoodcandidateforinner-autonomoussystemroutingbecauseaninternetisusuallytoobigforthisroutingmethod.Touselinkstateroutingforthewholeinternetwouldrequireeachroutertohaveahugelinkstatedatabase.Itwouldalsotakealongtimeforeachroutertocalculateitsrouting5usingtheDijkstraalgorism. 2是
PC机不能接入因特网这时采用抓包工具捕获的以太网接口发出的信息如下图所示 可以看出该PC机的IP地址为1默认网关的IP地址为2PC不能接入Internet的原因可能是3 3处填
Althoughagivenwaveformmaycontainfrequenciesoveraverybroadrangeasapracticalmatteranytransmissionsystemwillbeabletoaccommodateonlyalimitedbandof1.Thisinturnlimitsthedataratethatcanbecarriedonthetransmission2.Asquarewavehasaninfinitenumberoffrequencycomponentsandhenceaninfinite3.Howeverthepeakamplitudeofthekthfrequencycomponentkfisonlyl/ksomostofthe4inthiswaveformisinthefirstfewfrequencycomponents.Ingeneralanydigitalwaveformwillhave5bandwidth.Ifweattempttotransmitthiswaveformasasignaloveranymediumthetransmissionsystemwilllimitthebandwidththatcanbetransmitted. 2是
TraditionalIPpacketforwardinganalyzesthe1IPaddresscontainedinthenetworklayerheaderofeachpacketasthepackettravelsfromitssourcetoitsfinaldestination.ArouteranalyzesthedestinationIPaddressindependentlyateachhopinthenetwork.Dynamic 2protocolsorstaticconfigurationbuildsthedatabaseneededtoanalyzethedestinationIPaddresstheroutingtable.TheprocessofimplementingtraditionalIProutingalsoiscalledhop-by-hopdestination-based3routing.Althoughsuccessfulandobviouslywidelydeployedcertainrestrictionswhichhavebeenrealizedforsometimeexistforthismethodofpacketforwardingthatdiminishits4.NewtechniquesarethereforerequiredtoaddressandexpandthefunctionalityofanIP-basednetworkinfrastructure.Thisfirstchapterconcentrateonidentifyingtheserestrictionsandpresentsanewarchitectureknownasmultipleprotocol5switchingthatprovidessolutionstosomeoftheserestrictions. 1是
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