CCNA题库150题.docx
《CCNA题库150题.docx》由会员分享，可在线阅读，更多相关《CCNA题库150题.docx（24页珍藏版）》请在冰豆网上搜索。
CCNA题库150题
1.Whataretworeasonsthatanetworkadministratorwoulduseaccesslists?
（Choosetwo.）
A.tocontrolvtyaccessintoarouter
B.tocontrolbroadcasttrafficthrougharouter
C.tofiltertrafficasitpassesthrougharouter
D.tofiltertrafficthatoriginatesfromtherouter
E.toreplacepasswordsasalineofdefenseagainstsecurityincursions
2.AdefaultFrameRelayWANisclassifiedaswhattypeofphysicalnetwork?
A.point-to-point
B.broadcastmulti-access
C.nonbroadcastmulti-access
D.nonbroadcastmultipoint
E.broadcastpoint-to-multipoint
3.Refertotheexhibit.Howmanybroadcastdomainsexistintheexhibitedtopology?
A.one
B.two
C.three
D.four
E.five
F.six
4.Asingle802.11gaccesspointhasbeenconfiguredandinstalledinthecenterofasquareoffice.Afewwirelessusersareexperiencingslowperformanceanddropswhilemostusersareoperatingatpeakefficiency.Whatarethreelikelycausesofthisproblem?
（Choosethree.）
A.mismatchedTKIPencryption
B.nullSSID
C.cordlessphones
D.mismatchedSSID
E.metalfilecabinets
F.antennatypeordirection
5.Refertotheexhibit.WhattwofactscanbedeterminedfromtheWLANdiagram?
（Choosetwo.）
A.Theareaofoverlapofthetwocellsrepresentsabasicserviceset（BSS）.
B.Thenetworkdiagramrepresentsanextendedserviceset（ESS）.
C.Accesspointsineachcellmustbeconfiguredtousechannel1.
D.Theareaofoverlapmustbelessthan10%oftheareatoensureconnectivity.
E.ThetwoAPsshouldbeconfiguredtooperateondifferentchannels.
6.Thecommandframe-relaymapip10.121.16.8102broadcastwasenteredontherouter.Whichofthefollowingstatementsistrueconcerningthiscommand?
A.Thiscommandshouldbeexecutedfromtheglobalconfigurationmode.
B.TheIPaddress10.121.16.8isthelocalrouterportusedtoforwarddata.
C.102istheremoteDLCIthatwillreceivetheinformation.
D.ThiscommandisrequiredforallFrameRelayconfigurations.
E.Thebroadcastoptionallowspackets,suchasRIPupdates,tobeforwardedacrossthePVC.
7.WhichtypeofattackischaracterizedbyafloodofpacketsthatarerequestingaTCPconnectiontoaserver?
A.denialofservice
B.bruteforce
C.reconnaissance
D.Trojanhorse
8.WhichofthefollowingareassociatedwiththeapplicationlayeroftheOSImodel?
（Choosetwo.）
A.ping
B.Telnet
C.FTP
D.TCP
E.IP
9.Forsecurityreasons,thenetworkadministratorneedstopreventpingsintothecorporatenetworksfromhostsoutsidetheinternetwork.Whichprotocolshouldbeblockedwithaccesscontrollists?
A.IP
B.ICMP
C.TCP
D.UDP
10.Refertotheexhibit.ThenetworkadministratorhascreatedanewVLANonSwitch1andaddedhostCandhostD.TheadministratorhasproperlyconfiguredswitchinterfacesFastEthernet0/13throughFastEthernet0/24tobemembersofthenewVLAN.However,afterthenetworkadministratorcompletedtheconfiguration,hostAcouldcommunicatewithhostB,buthostAcouldnotcommunicatewithhostCorhostD.Whichcommandsarerequiredtoresolvethisproblem?
A.Router（config）#interfacefastethernet0/1.3
Router（config-if）#encapsulationdot1q3
Router（config-if）#ipaddress192.168.3.1255.255.255.0
B.Router（config）#routerrip
Router（config-router）#network192.168.1.0
Router（config-router）#network192.168.2.0
Router（config-router）#network192.168.3.0
C.Switch1#vlandatabase
Switch1（vlan）#vtpv2-mode
Switch1（vlan）#vtpdomaincisco
Switch1（vlan）#vtpserver
D.Switch1（config）#interfacefastethernet0/1
Switch1（config-if）#switchportmodetrunk
Switch1（config-if）#switchporttrunkencapsulationisl
11.Whataretworecommendedwaysofprotectingnetworkdeviceconfigurationfilesfromoutsidenetworksecuritythreats?
（Choosetwo.）
A.AllowunrestrictedaccesstotheconsoleorVTYports.
B.Useafirewalltorestrictaccessfromtheoutsidetothenetworkdevices.
C.AlwaysuseTelnettoaccessthedevicecommandlinebecauseitsdataisautomaticallyencrypted.
D.UseSSHoranotherencryptedandauthenticatedtransporttoaccessdeviceconfigurations.
E.Preventthelossofpasswordsbydisablingpasswordencryption.
12.Refertotheexhibit.TheaccesslisthasbeenconfiguredontheS0/0interfaceofrouterRTBintheoutbounddirection.Whichtwopackets,ifroutedtotheinterface,willbedenied?
（Choosetwo.）
access-list101denytcp192.168.15.320.0.0.15anyeqtelnet
access-list101permitipanyany
A.sourceipaddress:
192.168.15.5;destinationport:
21
B.sourceipaddress:
192.168.15.37destinationport:
21
C.sourceipaddress:
192.168.15.41destinationport:
21
D.sourceipaddress:
192.168.15.36destinationport:
23
E.sourceipaddress:
192.168.15.46;destinationport:
23
F.sourceipaddress:
192.168.15.49destinationport:
23
13.Refertotheexhibit.Switch1hasjustbeenrestartedandhaspassedthePOSTroutine.HostAsendsitsinitialframetoHostC.Whatisthefirstthingtheswitchwilldoasregardspopulatingtheswitchingtable?
A.Switch1willadd192.168.23.4totheswitchingtable.
B.Switch1willadd192.168.23.12totheswitchingtable.
C.Switch1willadd000A.8A47.E612totheswitchingtable.
D.Switch1willadd000B.DB95.2EE9totheswitchingtable.
14.TheuserofHost1wantstopingtheDSLmodem/routerat192.168.1.254.BasedontheHost1ARPtablethatisshownintheexhibit,whatwillHost1do?
A.sendaunicastARPpackettotheDSLmodem/router
B.sendunicastICMPpacketstotheDSLmodem/router
C.sendLayer3broadcastpacketstowhichtheDSLmodem/routerresponds
D.sendaLayer2broadcastthatisreceivedbyHost2,theswitch,andtheDSLmodem/router
15.Whataretwosecurityappliancesthatcanbeinstalledinanetwork?
（Choosetwo.）
A.ATM
B.IDS
C.IOS
D.IOX
E.IPS
F.SDM
16.Refertotheexhibit.WhatisthemostefficientsummarizationthatR1canusetoadvertiseitsnetworkstoR2?
A.172.1.0.0/22
B.172.1.0.0/21
C.172.1.4.0/22
D.172.1.4.0/24
172.1.5.0/24
172.1.6.0/24
172.1.7.0/24
E.172.1.4.0/25
172.1.4.128/25
172.1.5.0/24
172.1.6.0/24
172.1.7.0/24
17.Whichspreadspectrumtechnologydoesthe802.11bstandarddefineforoperation?
A.IR
B.DSSS
C.FHSS
D.DSSSandFHSS
E.IR,FHSS,andDSSS
18.Refertotheexhibit.Assumethatallrouterinterfacesareoperationalandcorrectlyconfigured.Inaddition,assumethatOSPFhasbeencorrectlyconfiguredonrouterR2.HowwillthedefaultrouteconfiguredonR1affecttheoperationofR2?
A.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR1willbedropped.
B.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR2willbedroppedimmediately.
C.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR2willbedroppedimmediatelybecauseofthelackofagatewayonR1.
D.ThenetworksdirectlyconnectedtorouterR2willnotbeabletocommunicatewiththe172.16.100.0,172.16.100.128,and172.16.100.64subnetworks.
E.AnypacketdestinedforanetworkthatisnotreferencedintheroutingtableofrouterR2willbedirectedtoR1.R1willthensendthatpacketbacktoR2andaroutingloopwilloccur.
19.Anetworkinterfaceporthascollisiondetectionandcarriersensingenabledonasharedtwistedpairnetwork.Fromthisstatement,whatisknownaboutthenetworkinterfaceport?
A.Thisisa10Mb/sswitchport.
B.Thisisa100Mb/sswitchport.
C.ThisisanEthernetportoperatingathalfduplex.
D.ThisisanEthernetportoperatingatfullduplex.
E.ThisisaportonanetworkinterfacecardinaPC.
20.Refertothetopologyandrouterconfigurationshowninthegraphic.AhostontheLANisaccessinganFTPserveracrosstheInternet.Whichofthefollowingaddressescouldappearasasourceaddressforthepacketsforwardedbytheroutertothedestinationserver?
A.10.10.0.1
B.10.10.0.2
C.199.99.9.33
D.199.99.9.57
E.200.2.2.17
F.200.2.2.18
21.AcompanyisinstallingIPphones.Thephonesandofficecomputersconnecttothesamedevice.Toensuremaximumthroughputforthephonedata,thecompanyneedstomakesurethatthephonetrafficisonadifferentnetworkfromthatoftheofficecomputerdatatraffic.Whatisthebestnetworkdevicetowhichtodirectlyconnectthephonesandcomputers,andwhattechnologyshouldbeimplementedonthisdevice?
（Choosetwo.）
A.hub
B.router
C.switch
D.STP
E.subinterfaces
F.VLAN
22.Refertotheexhibit.WhichstatementdescribesDLCI17?
A.DLCI17describestheISDNcircuitbetweenR2andR3.
B.DLCI17describesaPVConR2.ItcannotbeusedonR3orR1.
C.DLCI17istheLayer2addressusedbyR2todescribeaPVCtoR3.
D.DLCI17describesthedial-upcircuitfromR2andR3totheserviceprovider.
23.Whichroutingprotocolbydefaultusesbandwidthanddelayasmetrics?
A.RIP
B.BGP
C.OSPF
D.EIGRP
24.Refertotheoutputfromtheshowrunning-configcommandintheexhibit.WhatshouldtheadministratordotoallowtheworkstationsconnectedtotheFastEthernet0/0interfacetoobtainanIPaddress?
A.Applyaccess-group14tointerfaceFastEthernet0/0.
B.Addaccess-list14permitanyanytotheaccesslistconfiguration.
C.ConfiguretheIPaddressoftheFastEtherent0/0interfaceto10.90.201.1.
D.AddaninterfacedescriptiontotheFastEthernet0/0interfaceconfiguration.
25.IntheimplementationofVLSMtechniquesonanetworkusingasingleClassCIPaddress,whichsubnetmaskisthemostefficientforpoint-to-pointseriallinks?
A.255.255.255.0
B.255.255.255.240
C.255.255.255.248
D.255.255.255.252
E.2
升级会员 