CCNA考试题库中英文翻译版及标准答案.docx
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CCNA考试题库中英文翻译版及标准答案
CCNA考试题库中英文翻译版及答案
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CCNA考试题库中英文翻译版及答案1[1]
1.Whataretworeasonsthatanetworkadministratorwoulduseaccesslists?
（Choosetwo.）
1.出于哪两种理由，网络管理员会使用访问列表?
A.tocontrolvtyaccessintoarouter
A.控制通过VTY访问路由器
B.tocontrolbroadcasttrafficthrougharouter
B.控制广播流量穿越路由器
2.一个默认的帧中继WAN被分类为哪种物理网络类型?
A.point-to-point
A.点到点
B.broadcastmulti-access
B.广播多路访问
C.nonbroadcastmulti-access
C.非广播多路访问
D.nonbroadcastmultipoint
D.非广播多点
E.broadcastpoint-to-multipoint
E.广播点到多点
Answer:
C
3.Asingle802.11gaccesspointhasbeenconfiguredandinstalledinthecenterofasquar
Afewwirelessusersareexperiencingslowperformanceanddropswhilemostusersareo
atpeakefficiency.Whatarethreelikelycausesofthisproblem?
（Choosethree.）
3.一个802.11接入点被部署在一个方形办公室的中央，当大多数用户在大流量传输数
一些无线用户发现无线网络变得缓慢和出现丢包
A.mismatchedTKIPencryption
B.nullSSID
C.cordlessphones
D.mismatchedSSID
E.metalfilecabinets
F.antennatypeordirection
Answer:
CEF
4.Refertotheexhibit.Howmanybroadcastdomainsexistintheexhibitedtopology?
根据下图，图中的拓扑中存在多少个广播域?
A.one A.1
B.two B.2
C.three C.3
D.four D.4
E.five E.5
F.six F.6
Answer:
C
5.Refertotheexhibit.WhattwofactscanbedeterminedfromtheWLANdiagram?
（Choosetwo.）
5.根据下图，WLANdiagram决定了哪两个事实
A.Theareaofoverlapofthetwocellsrepresentsabasicserviceset（BSS）.
A.两个cells的overlap的区域描述了一个basicserviceset
B.Thenetworkdiagramrepresentsanextendedserviceset（ESS）.
B.网络描述了一个extendedserviceset
C.Accesspointsineachcellmustbeconfiguredtousechannel1.
C.再每个CELL中的AP必须被配置成使用channel1
D.Theareaofoverlapmustbelessthan10%oftheareatoensureconnectivity.
D.为了确保连通性,重叠区域必须小于10%
E.ThetwoAPsshouldbeconfiguredtooperateondifferentchannels.
E.两个访问点应该被配置成工作在不同的频道
Answer:
BE
6.Thecommandframe-relaymapip10.121.16.8102broadcastwasenteredontherouter.Whichofthefollowingstatementsistrueconcerningthiscommand?
6.路由器上输入命令frame-relaymapip10.121.16.8102broadcast，以下选项正确的是?
A.Thiscommandshouldbeexecutedfromtheglobalconfigurationmode.
A.该命令应该在全局配置模式下被执行
B.TheIPaddress10.121.16.8isthelocalrouterportusedtoforwarddata.
B.IP地址10.121.16.8是本地路由器用来转发数据的接口
C.102istheremoteDLCIthatwillreceivetheinformation.
C.102是远端的DLCI它将接受信息。
D.ThiscommandisrequiredforallFrameRelayconfigurations.
D.这个命令要求被配置为所有的帧中继配置。
E.Thebroadcastoptionallowspackets,suchasRIPupdates,tobeforwardedacrossthePVC.
E.这个广播选项允许数据包，例如rip更新信息，将会被转发通过PVC.
Answer:
E
7.WhichtypeofattackischaracterizedbyafloodofpacketsthatarerequestingaTCPconnection
toaserver?
7.哪种类型的攻击的特点是发大量的TCP请求连接数据包到服务器?
A.denialofservice A.拒绝服务
B.bruteforce B.强制叠加
C.reconnaissance C.监听
D.Trojanhorse D.木马
Answer:
A
8.WhichofthefollowingareassociatedwiththeapplicationlayeroftheOSImodel?
（Choose
two.）
8.以下两个选项是工作在OSI模型的应用层的?
A.ping B.Telnet
C.FTP D.TCP E.IP
Answer:
BC
9.Refertotheexhibit.ThenetworkadministratorhascreatedanewVLANonSwitch1andaddedhostCandhostD.TheadministratorhasproperlyconfiguredswitchinterfacesFastEthernet0/13throughFastEthernet0/24tobemembersofthenewVLAN.However,afterthenetworkadministratorcompletedtheconfiguration,hostAcouldcommunicatewithhostB,buthostAcouldnotcommunicatewithhostCorhostD.Whichcommandsarerequiredtoresolvethisproblem?
9.网络管理员在交换机1上创建一个新VLAN并且将主机C和主机D加入到此VLAN中.管理员配置交换机接口FastEthernet0/13到FastEthernet0/24成为新VLAN成员.但是网络管理员完成配置以后,主机A可以和主机B通信,但是主机A不能和主机C或者主机D通信.哪个命令可以用来解决这个问题
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
Answer:
A
10.Forsecurityreasons,thenetworkadministratorneedstopreventpingsintothecorporatenetworksfromhostsoutsidetheinternetwork.Whichprotocolshouldbeblockedwithaccesscontrollists?
10.出于安全考虑，网络管理员需要去防止外网主机PING内网，下面那个协议应该用accesscontrollists限制掉
A.IP B.ICMP
C.TCP D.UDP
Answer:
B
11.Whataretworecommendedwaysofprotectingnetworkdeviceconfigurationfilesfromoutsidenetworksecuritythreats?
（Choosetwo.）
11.哪两种方法被推荐用来保守网络设备的配置文件不受外网的威胁
A.AllowunrestrictedaccesstotheconsoleorVTYports.
A.允许unrestricted访问到console或VTY口
B.Useafirewalltorestrictaccessfromtheoutsidetothenetworkdevices.
B.用防火墙去限制外网的网络设备访问
C.AlwaysuseTelnettoaccessthedevicecommandlinebecauseitsdataisautomaticallyencrypted.
C.因为数据被自动加密，所以总是允许使用TELNET命令访问网络设备的命令行，
D.UseSSHoranotherencryptedandauthenticatedtransporttoaccessdeviceconfigurations.
D.使用SSH或其他加密、认证机制去访问设备的配置
E.Preventthelossofpasswordsbydisablingpasswordencryption.
E.为了避免丢失密码，所以不对密码进行加密（明文）
Answer:
BD
12.Refertotheexhibit.TheaccesslisthasbeenconfiguredontheS0/0interfaceofrouterRTBintheoutbounddirection.Whichtwopackets,ifroutedtotheinterface,willbedenied?
（Choosetwo.）
12.根据下图，该accesslist被配置在路由器RTB的S0/0接口上的OUT方向，哪两个数据包会被DENY，如果被路由到该接口上的话?
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
Answer:
DE
13.Whataretwosecurityappliancesthatcanbeinstalledinanetwork?
（Choosetwo.）
13.以下哪两个安全工具能被安装在一个网络里
A.ATM B.IDS
C.IOS D.IOX
E.IPS F.SDM
Answer:
BE
14.Refertotheexhibit.Switch1hasjustbeenrestartedandhaspassedthePOSTroutine.HostAsendsitsinitialframetoHostC.Whatisthefirstthingtheswitchwilldoasregardspopulatingtheswitchingtable?
14.根据下图，Switch1刚刚完成重启，并完成上电自检。
HostA发送它的第一个侦到HostC，交换机首先会对switchingtable做什么操作
A.Switch1willadd192.168.23.4totheswitchingtable.
A.Switch1会添加192.168.23.4到switchingtable.
B.Switch1willadd192.168.23.12totheswitchingtable.
B.Switch1添加192.168.23.12到switchingtable.
C.Switch1willadd000A.8A47.E612totheswitchingtable.
C.Switch1添加000A.8A47.E612到switchingtable.
D.Switch1willadd000B.DB95.2EE9totheswitchingtable.
D.Switch1添加000B.DB95.2EE9到switchingtable.
Answer:
C
15.TheuserofHost1wantstopingtheDSLmodem/routerat192.168.1.254.BasedontheHost1ARPtablethatisshownintheexhibit,whatwillHost1do?
15.Host1的用户想PINGDSL调制解调器/路由器的192.168.1.254，ARP表如下图，Host1会怎么操作?
A.sendaunicastARPpackettotheDSLmodem/router
A.发送一个单播ARP包到DSL调制解调器/路由器
B.sendunicastICMPpacketstotheDSLmodem/router
B.发送一个单播ICMP包到DSL调制解调器/路由器
C.sendLayer3broadcastpacketstowhichtheDSLmodem/routerresponds
C.发送三层广播包到响应的DSL调制解调器/路由器
D.sendaLayer2broadcastthatisreceivedbyHost2,theswitch,andtheDSLmodem/router
D.发送一个可以被Host2,theswitch,andtheDSLmodem/router受到的2层广播帧
Answer:
B
16.Refertotheexhibit.WhatisthemostefficientsummarizationthatR1canusetoadvertiseitsnetworkstoR2?
16.根据下图，R1能通告给R2的最有效的汇总是?
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
Answer:
C
17.Whichspreadspectrumtechnologydoesthe802.11bstandarddefineforoperation?
17.哪种扩频技术是802.11B定义使用的
A.IR B.DSSS C.FHSS D.DSSSandFHSS
E.IR,FHSS,andDSSS
Answer:
B
18.Refertotheexhibit.Assumethatallrouterinterfacesareoperationalandcorrectlyconfigured.Inaddition,assumethatOSPFhasbeencorrectlyconfiguredonrouterR2.HowwillthedefaultrouteconfiguredonR1affecttheoperationofR2?
18.根据下图，假设所有路由器接口都配置正确且正常工作，假设R2上OSPF配置正确，配置在R1上默认路由会怎么影响R2的工作
A.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR1willbedropped.
A.任何到达一个和路由器R1非直连的网络的数据包都会被丢弃
B.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR2willbedroppedimmediately.
B.任何到达一个和路由器R2非直连的网络的数据包都会被丢弃
C.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR2willbedroppedimmediatelybecauseofthelackofagatewayonR1.
C.任何到达一个和路由器R2非直连的网络的数据包都会即时被丢弃，因为R1上缺少网关
D.ThenetworksdirectlyconnectedtorouterR2willnotbeabletocommunicatewiththe172.16.100.0,172.16.100.128,and172.16.100.64subnetworks.
D.直连在R2上的网络将不能够和172.16.100.0,172.16.100.128,172.16.100.64这些子网通讯
E.AnypacketdestinedforanetworkthatisnotreferencedintheroutingtableofrouterR2willbedirectedtoR1.R1willthensendthatpacketbacktoR2andaroutingloopwilloccur.
E.任何目的地没有在R2的路由表中的数据包,R2将会定向到R1,R1会发送哪个数据包到R2,这样路由环路产生
Answer:
E
19.Anetworkinterfaceporthascollisiondetectionandcarriersensingenabledonasharedtwistedpairnetwork.Fromthisstatement,whatiskno
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