“路由和交换”自我水平测试评估1.WANsfunctionatwhichtwolayersoftheOSImodel?(Choosetwo.)sessionnetworkphysicaltransportdatalink1.广域网在OSI模型的哪两层上发挥作用?(选择两项。)会话层网络层物理层传输层数据链路层2.Whichprotocolroutesbetweendifferentautonomoussystems?EGPIGPIPPIPXTCP2.哪一协议能够在不同的自治系统之间进行路由?EGPIGPIPPIPXTCP3.Howmanytwistedpairsofwiresaretypicallyusedinaleasedlinebetweentworouters?twopairsthreepairsfivepairsfourpairs3.两台路由器直接用双绞线直连时,需要多少对线缆传输数据?两对三对五对四对4.WhichtwolayersoftheOSImodeldotheTCP/IPprotocolsoperateat?(Choosetwo.)networkphysicaltransportdatalink4.TCP/IP协议运行在OSI模型上的哪两层?(选择两项。)网络层物理层传输层数据链路层5.YourcompanyhasroutersinSanJoseandRaleigh.Whattypeofnetworkwouldconnecttheserouters?WANLANEPASAN5.您的公司在圣何塞和罗利部署有路由器。使用哪种网络才能够将这些路由器连接在一起?广域网局域网EPASAN6.Whichapproacheliminatesloopswhenmultipleswitchesareimplementedinanetwork?MicrosegmentationSpanningTreeProtocolinstallingarouterbetweenswitchesonlyuseoneswitchwheneveraloopispossible6.当一个网络中部署了多台交换机时,哪一种方法能够消除循环?微分段生成树协议在交换机间安装路由器在可能出现循环时,仅使用一个交换机7.WhichlayeroftheOSImodelprovidestranslationofdata?ApplicationPresentationSessionTransportdatalink7.OSI模型的哪一层负责数据转换工作?应用层表示层会话层传输层数据链路层8.AllhostsonaparticularLANsegmentuseIPaddressesthatbeginwith150.1.1.Subnettingisbeingused,andtreatsthefirstthreeoctetsasthesubnet.Whichsubnetnumberisusedtorepresentthesubnet?192.168.10.60192.168.10.47150.1.1.0192.168.10.548.一个特定局域网段上的所有主机均使用了150.1.1开头的IP地址,并启用了子网划分功能,将前三个八位位组视为子网。哪一个子网编号将用于代表这一子网?192.168.10.60192.168.10.47150.1.1.0192.168.10.549.Whatisthehigh-orderbitpatternforaClassBnetwork?01xxxxxx0xxxxxxx10xxxxxx110xxxxx9.ClassB网络的高位模式是什么?01xxxxxx0xxxxxxx10xxxxxx110xxxxx10.WhichoftheseisalayerintheOSImodelbutisnotpartoftheTCP/IPprotocolstack?physicallayerdatalinklayernetworklayertransportlayerpresentationlayer10.以下哪一个是OSI模型中的一层,但不是TCP/IP协议堆栈的一部分?物理层数据链路层网络层传输层表示层11.WhichtwoofthesearepartoftheTCP/IPprotocolstack?(Choosetwo.)applicationlayersessionlayerInternetlayerpresentationlayernetworkaccesslayer11.以下哪两项是TCP/IP协议堆栈的一部分?(选择两项。)应用层会话层互联网层表示层网络接入层12.Duringpathselection,whichthreeofthesemetricsmaybeusedbyroutingprotocols?(Choosethree.)DelayWeightDirectionhopcountBandwidthMED12.在路径选择过程中,路由协议可能会使用这些标准中的哪三个?(选择三项。)延迟权重方向跳数带宽MED13.Whatisthehigh-orderbitpatternforaClassAnetwork?01xxxxxx111xxxxx10xxxxxx0xxxxxxx13.ClassA网络的高位模式是什么?01xxxxxx111xxxxx10xxxxxx0xxxxxxx14.Whichofthesebestdescribes“flooding”asitreferstoswitches?Iftheswitchdoesnothaveanentryforthedestinationaddress,itwilltransmittheframeoutofallportsexcepttheportonwhichitreceivedtheframe.IftheswitchdeterminesthatthedestinationMACaddressoftheframeresidesonthesamenetworksegmentasthesource,itdoesnotforwardtheframe.IftheswitchdeterminesthatthedestinationMACaddressoftheframeisnotfromthesamenetworkasthesource,ittransmitstheframetotheappropriatesegment.Whenadenialofserviceattackoccurs,itcausesaswitch’sCAMtabletobecomefullypopulated.14.以下那一项恰当地描述了交换机“泛洪”(flooding)操作?如果交换机中没有针对目标地址的记录,它将向所有端口传输该数据帧,数据帧的来源端口除外。如果交换机确定数据帧的目标MAC地址位于同来源端口相同的网段,它不会转发数据帧。如果交换机确定数据帧的目标MAC地址与来源端口的网络不同,它将向相关网段传输该数据帧。当拒绝服务攻击发生时,它会导致交换机的CAM表被写满。15.Howmanyframescanpassthrougha24-portswitchsimultaneously,withoutcausingacollisionandwithfullduplexusedonallports?181624326415.在一个24端口交换机上,当所有端口均启用全双工支持时,在不产生冲突的情况下最多可以同时通过多少个帧?181624326416.Howmanyframescanpassthrougha24-porthubsimultaneously,withoutcausingacollision?OneTwoFourEight16.在不产生冲突的情况下,一个24端口集线器能够同时通过多少个帧?124817.AccordingtoRFC1918,whichtwooftheseaddressesareconsideredprivateaddresses?(Choosetwo.)10.12.21.118.24.7.245172.16.34.18172.47.88.89212.45.22.1217.根据RFC1918,以下哪两个地址属于私有地址?(选择两项。)10.12.21.118.24.7.245172.16.34.18172.47.88.89212.45.22.1218.WhatkindofphysicalinterfacedoesarouterusetoconnecttoaWANlink?Ethernethostbusadapterparallelinterfaceserialinterface18.路由器使用哪一类物理接口与广域网链路进行连接?以太网主机总线适配器并行接口串行接口19.HowmanyTCPsegmentsflowbetweentwocomputerstoestablishaTCPconnection?OneTwoThreeFivedependsonwhattheTCPwindowsizeissetto19.两台计算机之间需要传输多少TCP段才能建立一个TCP连接?一个两个三个五个取决于设定的TCP窗口大小20.Imaginethatyouvisitawebsiteanddownloadagraphicimagecalledlogo.gif.Thelogois4000bytes.AssuminganMSSof1480bytes,howmanysegmentswilltheserversendbacktoyourbrowsertosendyouthelogo?2segments3segments4segments5segments10segments20.假设您正在访问一个网站,要下载一个名为logo.gif的图片。该标识的大小为4,000字节。假定MSS值为1480字节,服务器需要向您的浏览器返回多少个片段以向您发送该标识?2个片段3个片段4个片段5个片段10个片段21.RouterR4hastwoworkingEthernetinterfaces,andeachinterfacehasbeenconfiguredwithanIPaddress.WhatistheminimumnumberofroutesthatR4shouldhaveinitsroutingtable?oneroutesplitbetweeneachdirectlyconnectedsubnettworoutesforeachdirectlyconnectedsubnettworoutes,oneforeachdirectlyconnectedsubnetfourroutes,twoforeachdirectlyconnectedsubnetsixroutes,twoforeachdirectlyconnectedsubnet21.路由器R4有两个以太网接口正在工作,每一个接口均配置有IP地址。R4在其路由表中至少需具备多少个路由?一个路由,针对每一个直接连接的子网进行拆分两个路由,用于支持所有直接连接的子网两个路由,每一个直接连接的子网一个四个路由,每一个直接连接的子网两个六个路由,每一个直接连接的子网两个22.WhichofthesecommandscanbeusedtoloadanewversionofCiscoIOSsoftwareontoarouter?copytftpflashcopyftpflashloadflashtftpcopyflashftpcopytftpstartup-config22.以下哪一命令可用于在路由器上加载新版本的CiscoIOS软件?copytftpflashcopyftpflashloadflashtftpcopyflashftpcopytftpstartup-config23.Howmanywi