新版CCNA题库640802例题分析完整版V13四Word格式.docx
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A
171.Refertotheexhibit.Atechnicianistroubleshootingahostconnectivityproblem.ThehostisunabletopingaserverconnectedtoSwitch_A.Basedontheresultsofthetesting,whatcouldbetheproblem?
A.Aremotephysicallayerproblemexists.B.ThehostNICisnotfunctioning.
C.TCP/IPhasnotbeencorrectlyinstalledonthehost.D.Alocalphysicallayerproblemexists.
D主机ping自己能够ping通自己，但是包无法发送出去，表明自己的物理层有问题存在。
而因为能够ping通自己，表明TCP/IP的协议栈运行是良好的。
172.Aroutingprotocolisrequiredthatsupports:
1）routingupdateauthentication
2）anaddressingschemethatconservesIPaddresses
3）multiplevendors
4）anetworkwithover50routers
Whichroutingprotocolfulfillstheserequirements?
A.RIPv1B.RIPv2C.EIGRPD.OSPF
D首先RIPv1是不支持认证的，因此答案A我们可以排除。
是支持多厂商的，因此是一个开放的标准的协议，可以排除EIGPR，因为这是个CISCO私有的协议。
网络的大小可以超过50台路由器，那RIPv2就不满足了，因为RIP最大支持16跳。
那么答案就是OSPF了。
173.Refertotheexhibit.WhatisthecorrectaddressingforaframeandpacketreceivedbyHostBfromHostA?
A.DestinationMAC:
0011.43da.2c98
SourceMAC:
0070.0e8f.088a
DestinationIP:
192.168.60.5
SourceIP:
192.168.24.5
B.DestinationMAC:
00b0.d0ef.5f6a
C.DestinationMAC:
192.168.60.1
D.DestinationMAC:
0070.0e97.af4e
192.168.60.2
A我们来看一下包发送的过程：
HostA发送的：
sourceip:
192.168.24.5,destinationip:
192.168.60.5Sourcemac:
00b0.doef.5f6a,destinationmac:
0007.0e56.ab2eSwitch1收到后经过查找mactable,不做任何修改发往Router1Router1发送的：
sourceip192.168.24.5destinationip:
192.168.60.5Sourcemac:
0007.0e8f.088a,destinationmac:
0011.43da.2c98
174.Refertotheexhibit.ThenetworkadministratorhasverifiedthatafunctioningcableconnectsSwitch1andSwitch2.Fromtheoutputthatisshown,whattwopiecesofinformationcantheadministratorvalidlyconclude?
（Choosetwo.）
A.UsingasourceMACaddressof0009.11f3.8848,Switch2issendingframestoSwitch1.
B.Interfacefa0/1onSwitch1isinashutdownstate.
C.Thestatusoffa0/2shouldbecheckedonSwitch2.
D.ThereislikelytobeanIPaddressissueonSwitch1fa0/1.
E.TheinterfaceisfunctionalatOSILayer1.
CE接口显示的notconnect，当然需要检查对端的接口的状态了，一般来说交换机的接口显示为一up一down，是物理链路出现了问题。
因为他只有物理层是up的，所以我们只能说他工作在OSI的第一层。
175.WhichwirelessLANdesignensuresthatamobilewirelessclientwillnotloseconnectivitywhenmovingfromoneaccesspointtoanother?
A.usingadaptersandaccesspointsmanufacturedbythesamecompany
B.overlappingthewirelesscellcoveragebyatleast10%
C.configuringallaccesspointstousethesamechannel
D.utilizingMACaddressfilteringtoallowtheclientMACaddresstoauthenticatewiththesurroundingAPs
B
176.Refertotheexhibit.TwobuildingsontheSanJosecampusofasmallcompanymustbeconnectedtouseEthernetwithabandwidthofatleast100Mbps.Thecompanyisconcernedaboutpossibleproblemsfromvoltagepotentialdifferencesbetweenthetwobuildings.Whichmediatypeshouldbeusedfortheconnection?
A.UTPcableB.STPcableC.coaxialcableD.fiberopticcable
D电压不同，而且两个公司的距离不是很远，当然可以考虑光纤了。
177.AnetworkadministratorisconfiguringtheroutersinthegraphicforOSPF.TheOSPFprocesshasbeenstartedandthenetworkshavebeenconfiguredforArea0asshowninthediagram.ThenetworkadministratorhasseveraloptionsforconfiguringRouterBtoensurethatitwillbepreferredasthedesignatedrouter（DR）forthe172.16.1.0/24LANsegment.Whatconfigurationtaskscouldbeusedtoestablishthispreference?
（Choosethree.）
A.ConfigurethepriorityvalueoftheFa0/0interfaceofRouterBtoahighervaluethananyotherinterfaceontheEthernetnetwork.
B.ChangetherouteridofRouterBbyassigningtheIPaddress172.16.1.130/24totheFa0/0interfaceofRouterB.
C.ConfigurealoopbackinterfaceonRouterBwithanIPaddresshigherthananyIPaddressontheotherrouters.
D.ChangethepriorityvalueoftheFa0/0interfaceofRouterBtozero.
E.ChangethepriorityvaluesoftheFa0/0interfacesofRouterAandRouterCtozero.
F.Nofurtherconfigurationisnecessary.
ACEOSPF中的共享介质下是需要选举DR和BDR的，而这个选举的过程是通过比较优先级和RID来实现的。
优先级越高的越优先选举成为DR，优先级为0的接口是不参加DR的选举的，如果优先级相同就比较他们的RID,RID越大的越优先。
RID的选举过程是：
手工指定的最为优先，如果没有手工指定RID，则比较路由器上活动接口的IP地址，如果有回环口就选用回环口IP地址最大的地址作为RID,如果没有回环口，就选用物理接口地址中最大的IP地址为RID这个题中需要确保RouterB成为网络172.16.1.0/24的DR，根据上面的解释可以看出，让他成为DR的方式有：
改RouterB的f0/0的优先级为最大的；
改172.16.1.0/24网段上的其他接口的优先级为0;
设置RouterB的RID最大。
178Refertotheoutputofthetwoshowcommandsintheexhibit.Ifanadministratortriestopinghost10.1.8.5fromhost10.1.6.100,howwilltheICMPpacketsbeprocessedbyRouterA?
A.Thepacketswillbediscarded.B.ThepacketswillberoutedouttheS0/0interface.
C.ThepacketswillberoutedouttheS0/1interface.
D.ThepacketswillberoutedouttheFa0/0interface.
C可以看到10.1.8.5的网段不在路由表中，但是在RouterA的路由表中有一条RIP的缺省路由，因此可以收到的ICMP的报文是从s0/1来的。
179.Refertotheexhibit.TheBranchrouterdisplaysknowledgeofaroutetonetwork172.16.0.0/16.Theactualnetworknumberatheadquartersis172.16.1.0/24.Whydoesthenetworknumberappearasitdoesintheroutingtable?
A.TheBranchrouterhasastaticrouteconfiguredforthe172.16.0.0/16network.
B.TheroutingprotocolontheHQrouterisusingautomaticroutesummarization.
C.TheBranchrouterisconfiguredtosummarizetoclassfulboundaries.
D.TheroutingprotocolontheBranchrouterhasbeenmisconfigured.
E.Theroutingprotocolthatisforwardingthisrouteonlysendsclassfulupdates.
180.IPaddressesandroutingforthenetworkareconfiguredasshownintheexhibit.ThenetworkadministratorissuestheshowipeigrpneighborscommandfromRouter1andreceivestheoutputshownbelowthetopology.Whichstatementistrue?
A.ItisnormalforRouter1toshowoneactiveneighboratatimetopreventroutingloops.
B.RoutingisnotcompletelyconfiguredonRouter3.
C.TheIPaddressesarenotconfiguredproperlyontheRouter1andRouter3interfaces.
D.Thenoauto-summarycommandconfiguredontherouterspreventsRouter1andRouter2fromforminganeighborrelationship.
B在R3上只公告了192.168.2.0和10.0.0.0的网段，也只激活了接口S1和10.0.4.0的接口，而接口s0没有激活，因此R3与R1之间是无法建立邻居的。
虽然R1会向R3的S0口发EIGRP的Hello包，但是R3是无法回复的。
所以在R1上看到的EIGRP的邻居只有192.168.1.2。
181.Refertotheexhibit.WhyisflashmemoryerasedpriortoupgradingtheIOSimagefromtheTFTPserver?
A.TheroutercannotverifythattheCiscoIOSimagecurrentlyinflashisvalid.
B.FlashmemoryonCiscorouterscancontainonlyasingleIOSimage.
C.Erasingcurrentflashcontentisrequestedduringthecopydialog.
D.Inorderfortheroutertousethenewimageasthedefault,itmustbetheonlyIOSimageinflash.
C
182.Refertotheexhibit.Whichtwostatementsaretruebasedtheoutputoftheshowframe-relaylmicommandissuedontheBranchrouter?
A.LMImessagesarebeingsentonDLCI0.
B.LMImessagesarebeingsentonDLCI1023.
C.InterfaceSerial0/0isnotconfiguredtoencapsulateFrameRelay.
D.TheFrameRelayswitchisnotrespondingtoLMIrequestsfromtherouter.
E.TheLMIexchangebetweentherouterandFrameRelayswitchisfunctioningproperly.
F.TherouterisprovidingaclocksignalonSerial0/0onthecircuittotheFrameRelayswitch.
AD
183.Hotspot
184.LAB
Router>
en
Router#configterminal
Router（config）#hostnameWeaver
Router（config）#ipnatpoolnametest198.18.184.105198.18.184.110netmask255.255.255.248
Router（config）#ipnatinsidesourcelist1pooltest
Router（config）#access-list1permit192.168.100.160.0.0.15
Router（config）#ints0/0
Router（config-if）#ipnatoutside
Router（config-if）#exit
Router（config-if）#intfa0/0
Router（config-if）#ipnatinside
185.Refertotheexhibit.Thepartialframeshownintheexhibitdisplaysselectheaderinformationasitarrivesatthedestinationhost.Whichgraphicrepresentsthecorrectheaderinformationintherespondingframereturnedtotheremotehost?
D
186.Adentalfirmisredesigningthenetworkthatconnectsitsthreelocations.Theadministratorgavethenetworkingteam192.168.164.0touseforaddressingtheentirenetwok.Aftersubnettingtheaddress,theteamisreadytoassigntheaddresses.Theadministratorplanstoconfigureipsubnet-zeroanduseRIPv2astheroutingprotocol.Asamemberofthenetworkingteam,you
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