22年思科认证考试真题精选及答案5篇.docx

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1、22年思科认证考试真题精选及答案5篇22年思科认证考试真题精选及答案5篇 第1篇 哪种类型的验证使用三次握手()A.HDLCB.PPPC.PAPD.CHAP正确答案：D You have configured a Ezonexam switch as shown below:Ezonexam3(config-if) switchport port-securityEzonexam3(config-if) switchport port-security mac-address stickySelect the action below that results from executing t

2、hese commands.A. A dynamically learned MAC address is saved in the VLAN database.B. A dynamically learned MAC address is saved in the startup-configuration file.C. Statically configured MAC addresses are saved in the startup-configuration file if frames from that address are received.D. A dynamicall

3、y learned MAC address is saved in the running-configuration file.E. Statically configured MAC addresses are saved in the running-configuration file if frames from that address are received.F. None of the above正确答案：DD 解析：Explanation:With port security, the switch supports these types of secure MAC ad

4、dresses:Static secure MAC addresses-These are manually configured by using the switchport port-security mac-address mac-address interface configuration command, stored in the address table, and added to the switch running configuration.Dynamic secure MAC addresses-These are dynamically configured, s

5、tored only in the address table, and removed when the switch restarts.Sticky secure MAC addresses-These are dynamically configured, stored in the address table, and added to the running configuration. If these addresses are saved in the configuration file, when the switch restarts, the interface doe

6、s not need to dynamically reconfigure them.You can configure an interface to convert the dynamic MAC addresses to sticky secure MAC addresses and to add them to the running configuration by enabling sticky learning. To enable sticky learning, enter the switchport port-security mac-address sticky int

7、erface configuration command. When you enter this command, the interface converts all the dynamic secure MAC addresses, including those that were dynamically learned before sticky learning was enabled, to sticky secure MAC addresses. The interface adds all the sticky secure MAC addresses to the runn

8、ing configuration.The sticky secure MAC addresses do not automatically become part of the configuration file, which is the startup configuration used each time the switch restarts. If you save the sticky secure MAC addresses in the configuration file, when the switch restarts, the interface does not

9、 need to relearn these addresses. If you do not save the sticky secure addresses, they are lost. RIP路由协议将什么度量值视为无穷()A.0B.15C.16D.225正确答案：C EIGRP的管理距离（）A.90B.100C.110D.120正确答案：C要显示路由器支持的技术包许可证和功能许可证以及多个状态变量,可使用哪个命令?()A.show licenseB.show license featureC.show license udiD.show version答案：B 在配置帧中继子接口时，

10、在物理接口上应该配置的内容是：()A.配置IP地址B.封装帧中继协议C.指定子接口类型D.设定子接口E.配置密码正确答案：BCD 与动态路由协议相比，静态路由有哪些优点?()A.带宽占用少B.简单C.路由器能自动发现网络拓扑变化D.路由器能自动计算新的路由正确答案：AB22年思科认证考试真题精选及答案5篇 第2篇哪个命令用于将IOS备份到网络中的TFTP服务器?()A.transfer IOS t0 172.16.10.1B.copy run startC.copy tftp flashD.copy start tftpE.copy flash tftp答案：E 在一个C类地址网段要划分出32

11、个子网，下面那个子网掩码最适合（）A.255.255.255.252B.255.255.255.248C.255.255.255.240D.255.255.255.255正确答案：B 交换机的三大功能为（）A.地址学习B.转发过滤C.消除回路D.发送数据包正确答案：ABC The Ezonexam network administrator needs to verify that switch interface 0/5 has been assigned to the Marketing VLA.N. Which command will accomplish this task?A. S

12、how vlanB. Show mac-address-tableC. Show vtp statusD. show spanning-tree rootE. show ip interface briefF. None of the above正确答案：AA 解析：Explanation:The show vlan command displays the configured vlan name and ID as well as the ports that belong to each VLAN, etc. By default all ports belongs to VLAN 1N

13、ote: You can also use: show vlan brief, show vlan ID where ID is the VLAN ID. 对于运行OSPF协议的路由器来说，RouterID是路由器的唯一标识，所以协议规定：必须保证RouterID在如下范围之内唯一（）。A.网段内B.区域内C.自治系统内D.整个因特网正确答案：C 在路由表中到达同一网络的路由有：静态路由、RIP路由、IGRP路由，OSPF路由，则路由器会选用哪条路由传输数据：()A.静态路由B.RIP路由C.IGRP路由D.OSPF路由正确答案：A IP地址为：192.168.50.70，掩码为：255.25

14、5.255.248，则该IP和掩码结合划分子网时，每个子网的容量为（）A.8B.4C.12D.6正确答案：D22年思科认证考试真题精选及答案5篇 第3篇 Which line from the output of the show ip interface command indicates that there is a Layer 1 problem?ASerial0/1 is up, line protocol is downBSerial0/1 is down, line protocol is downCSerial0/1 is up, line protocol is upDSer

15、ial0/1 is administratively down, line protocol is downENone of the above正确答案：B解析：Explanation:When the physical interface itself is down, then the problem is related to layer 1. When it is up, but the line protocol is down, then the problem is related to layer 2. The LAN needs are expanding at the Ez

16、onexam corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the Ezonexam network.Which of the following are layer 1 devices that you can use? (Choose all that apply.)AA switchBA routerCA network adapter cardDA hubEA repeater正确答案：DE解析：E

17、xplanation:A hub simply repeats the electrical signal and makes no attempt to interpret the electrical signal (layer 1) as a LAN frame. (Layer 2). So, a hub actually performs OSI layer 1 functions, repeating an electrical signal, whereas a switch performs OSI layer 2 functions, actually interpreting

18、 Ethernet header information, particularly addresses, to make forwarding decisions. Hubs can be used to increase the number of stations that can be supported on a LAN.Because the repeater does not interpret what the bits mean, but does examine and generate electrical signals, a repeater is considere

19、d to operate at Layer 1. Repeaters can be used to physically extend the LAN to greater distances. 在一个运行OSPF的自治系统之内:()A.骨干区域自身也必须是连通的B.非骨干区域自身也必须是连通的C.必须存在一个骨干区域(区域号为0)D.非骨干区域与骨干区域必须直接相连或逻辑上相连正确答案：ACD 在一个C类地址网段要划分出32个子网，下面那个子网掩码最适合（）A.255.255.255.252B.255.255.255.248C.255.255.255.240D.255.255.255.255

20、正确答案：B要启用LACP,可将EtherChannel模式设置为下面哪两种之一?()A.OnB.PreventC.PassiveD.AutoE.ActiveF.Desirable答案：CE 假设有这样的组网实例:两个路由器(假设为RTA和RTB)通过串口相连接，其中RTA的串口IP地址是10.110.0.1/30，RTB的串口IP地址10.110.0.2/30，RTA通过以太口连接的本地局域网的IP地址是11.110.0.0/16，RTB通过以太口连接的本地局域网IP地址是11.111.0.0/16，在上面所有的接口上都启动RIPV1(仅仅RIPV1)协议，那么，下列说法正确的是()A.在R

21、TA的本地局域网上的计算机可以访问在RTB本地局域网上的计算机B.在RTB的本地局域网上的计算机可以访问在RTA本地局域网上的计算机C.在RTA的本地局域网上的计算机不能访问在RTB本地局域网上的计算机D.在RTB的本地局域网上的计算机不能访问在RTA本地局域网上的计算机正确答案：CD 在OSI七层模型中，介质工作在哪一层()A.传输层B.会话层C.物理层D.应用层正确答案：C22年思科认证考试真题精选及答案5篇 第4篇 为了使配置私有IP的设备能够访问互联网，应采用的技术是()A.NATB.VLANC.ACCESS-LISTD.DDR正确答案：A IGP是内部网关协议，BGP是外部网关协议。

22、此题为判断题(对，错)。正确答案： 以下对路由优先级的说法，正确的是()A.仅用于RIP和OSPF之间B.用于不同路由协议之间C.是路由选择的重要依据D.直接路由的优先级缺省为0正确答案：BCD哪个命令显示有关当前IOS版本的各种信息,包括许可细节(位于输出末尾)?()A.show licenseB.show license featureC.snow license udiD.show version答案：D You need to perform. some initial configuration tasks on a new Ezonexam switch. What is the

23、purpose of assigning an IP address to a switch?ATo provide local hosts with a default gateway addressBTo allow remote management of the switch.CTo allow the switch to respond to ARP requests between two hostsDTo ensure that hosts on the same LAN can communicate with each other.ENone of the above正确答案

24、：B解析：Explanation:Switchisalayer2deviceanddoesntusenetworklayerforpacketforwarding.TheIPaddressmaybeusedonlyforadministrativepurposessuchasTelnetaccessorfornetworkmanagementpurposes. Using a subnet mask of 255.255.255.224, which of the IP addresses below can you assign to the hosts on this subnet? (S

25、elect all that apply)A. 16.23.118.63B. 87.45.16.159C. 92.11.178.93D. 134.178.18.56E. 192.168.16.87F. 217.168.166.192正确答案：CDEC,D,E 解析：Explanation:Since the subnet mask is 255.255.255.224, the number of network hosts that is available is 30. Every network boundary will be a multiple of 32. This means

26、that every subnet will be a multiple (0, 32, 64, 96, 128, 160, 192, 224) and the broadcast address for each of these subnets will be one less this number (31, 63, 95, 127, 159, 191, 223). Therefore, any IP address that does not end in one of these numbers will be a valid host IP address.C. Valid Hos

27、t in subnetwork 2 (92.11.178.64 to 92.11.178.95)D. Valid Host in subnetwork 1 (134.178.18.32 to 134.178.18.63)E. Valid Host in subnetwork 2 (192.168.16.64 to 192.168.16.95)Incorrect Answers:A. This will be the broadcast address for the 16.23.118.32/27 network.B. This will be the broadcast address fo

28、r the 87.45.16.128/27 networkF. This will be the network address for the 217.168.166.192/27 network. 在广域网结构中使用什么连接DTE和DCE设备()。A.本地环路B.接口线缆C.路由器D.交换机正确答案：B22年思科认证考试真题精选及答案5篇 第5篇 备份路由器IOS的命令是：()A.copy flash tftpB.copy running-configt ftpC.copy IOS tftpD.copy startup-configt ftp正确答案：A 下图中如果允许192.168.1.

29、0/24和10.0.0.0/8的网络之间通信，必须要配置的两条命令是什么()A.A(config)iproute 10.0.0.0 255.0.0.0 172.16.40.2B.A(config)iproute 10.0.0.0 255.0.0.0 S0/0/0C.A(config)iproute 10.0.0.0 255.0.0.0 10.0.0.1D.B(config)iproute 192.168.1.0 255.255.255.0 172.16.40.1E.B(config)iproute 192.168.1.0 255.255.255.0 172.16.40.2F.Biproute

30、192.168.1.0 255.255.255.0 192.168.1.1正确答案：AD 请参见图示。172.16.31.64/27子网中的哪两个主机地址能够通过telnet连接到路由器并更改路由器配置（）A.172.16.31.33B.172.16.31.64C.172.16.31.77D.172.16.31.92E.172.16.31.95F.172.16.31.96正确答案：CD 网关的功能（）A.过滤数据包B.不同网段通信C.校验数据帧D.把数据封装成“段”正确答案：B You have a class B network with a 255.255.255.0 mask. Whic

31、h of the statements below are true of this network? (Select all valid answers)A. There are 254 usable subnets.B. There are 256 usable hosts per subnet.C. There are 50 usable subnets.D. There are 254 usable hosts per subnet.E. There are 24 usable hosts per subnet.F. There is one usable network.正确答案：A

32、DA,D 解析：Explanation:The default subnet mask for Class B is 255.255.0.0. Thus an extra 8 bits have been used for the network portion, leaving 8 for hosts. The 2n - 2 formula (28 - 2 in this case for both the network and IP hosts) gives us 254 networks and 254 hosts per network.Incorrect Answers:B: We

33、 must remember to always subtract 2 (one for the network, and one for the broadcast) so the result is 254, not 256.C, E: No possible network mask would give us this exact number of subnets or hosts.F: This would be true if this were a class C network, not a class B. 对于路由表，下列说法中正确的是：（）A.在缺省的情况下，如果一台路

34、由器同时运行了RIP和OSPF两种动态路由协议，则在路由表中只会显示RIP发现的路由，因为RIP协议的优先级更高B.在缺省的情况下，如果一台路由器同时运行了RIP和OSPF两种动态路由协议，则在路由表中只会显示OSPF发现的路由，因为OSPF协议的优先级更高C.在缺省的情况下，如果一台路由器同时运行了RIP和OSPF两种动态路由协议，则在路由表中只会显示RIP发现的路由，因为RIP协议的花费值（metric）更小D.在缺省的情况下，如果一台路由器同时运行了RIP和OSPF两种动态路由协议，则在路由表中只会显示OSPF发现的路由，因为OSPF协议的花费值（metric）更小正确答案：B Whic

35、h VTP mode should a Cisco switch be set to if this switch is to add or delete VLANs to a management domain?ATransparentBServerCAutoDClientEUser正确答案：B解析：Explanation:VTPModes:IfyouintendtomakeaswitchpartofaVTPmanagementdomain,eachswitchmustbeconfiguredinoneofthreepossibleVTPmodes.TheVTPmodeassignedtoa

36、switchwilldeterminehowtheswitchinteractswithotherVTPswitchesinthemanagementdomain.ThethreeVTPmodesthatcanbeassignedtoaCiscoswitchincludeservermode,clientmode,andtransparentmode.Eachoftheserolesisoutlinedbelow:ServerMode:OnceVTPisconfiguredonaCiscoswitch,thedefaultmodeusedisServerMode.InanygivenVTPma

37、nagementdomain,atleastoneswitchmustbeinServerMode.WheninServerMode,aswitchcanbeusedtoadd,delete,andmodifyVLANs,andthisinformationwillbepassedtoallotherswitchesintheVTPmanagementdomain.ClientMode:WhenaswitchisconfiguredtouseVTPClientMode,itissimplytherecipientofanyVLANsadded,deleted,ormodifiedbyaswit

38、chinServerModewithinthesamemanagementdomain.AswitchinVTPclientmodecannotmakeanychangestoVLANinformation.TransparentMode:AswitchinVTPTransparentModewillpassVTPupdatesreceivedbyswitchesinServerModetootherswitchesintheVTPmanagementdomain,butwillnotactuallyprocessthecontentsofthesemessages.Whenindividua

39、lVLANsareadded,deleted,ormodifiedonaswitchrunningintransparentmode,thechangesarelocaltothatparticularswitchonly,andarenotpassedtootherswitchesintheVTPmanagementdomain.BasedontherolesofeachVTPmode,theuseofeachshouldbemoreorlessobvious.Forexample,ifyouhad15Ciscoswitchesonyournetwork,youcouldconfiguree

40、achofthemtobeinthesameVTPmanagementdomain.AlthougheachcouldtheoreticallybeleftinthedefaultServerMode,itwouldprobablybeeasiertoleaveonlyoneswitchinthisconfiguration,andthenconfigureallremainingswitchesforVTPClientMode.Then,whenyouneedtoadd,delete,ormodifyaVLAN,thatchangecanbecarriedoutontheVTPServerM

41、odeswitchandpassedtoallClientModeswitchesautomatically.Incaseswhereyouneedaswitchtoactinarelativelystandalonemanner,ordonotwantittopropagateinformationaboutitsconfiguredVLANs,useTransparentMode.IncorrectAnswers:A.AswitchinVTPTransparentModewillpassVTPupdatesreceivedbyswitchesinServerModetootherswitchesintheVTPmanagementdomain,butwillnotactuallyprocessthecontentsofthesemessages.C,E.ThesearenotvalidVTPmodes.D.ClientmodemerelyacceptschangesmadebytheswitchthatisconnectedandinSERVERmode.