CCNA考试每日一题
思科认证CCNA认证试题与答案中文版
答案：D 注释:这个题目不是太严谨,应该加上子网掩码. A:224. 0. 0. 5 是多播地址 B: 127. 0.0. 0 保留作为测试使用 C:网络地址 26、 设置主接口由 up 转 down 后延迟 30 秒切换到备份接口，主 接口 由 down 转 up 后 60 秒钟切换回主接口的配置为()
忍一句，息一怒，饶一着，退一步。——《增广贤文》
人之为学，不日进则日退，独学无友，则孤陋而难成；久处一方，则习染而不自觉。——《顾炎武》
答案：D 注释:255. 255. 255. 255 是全网广播,DHCP 客户端发送全网广播来 查 找 DHCP 服务器. 24、 下而有关 NAT 叙述正确的是() (A) NAT 是英文“地址转换”的缩写，又称地址翻译 (B) XAT 用来实现私有地址与公用网络地址之间的转换 (C) 当内部网络的主机访问外部网络的时候，一定不需要 NAT (D) 地址转换的提出为解决 IP 地址紧张的问题提供了一个有效途 径 答案:ABD 25、 以下属于正确的主机的 IP 地址的是()
(A) arp-a (B) traceroute (C) routeprint (D) displayiprouting-table
答案：D 23、 D0. 0. 0 (B) 10. 0. 0. 1 (0127. 0. 0. 1 (D)255. 255. 255. 255
192. 168. 1. 1
答案：D 注释:PC 的'默认网关要指向路由器的以太网口的 IP 地址. 28、 ISDNB 信道速率是()
(A) 16kbps (B) 64kbps
CCNA基础测试题及答案
CCNA试题1.What is the correct order for the OSI model? BP=Presentation, S=Session, D=Datalink, Ph=Physical, T=Transport, A= Application, N=NetworkA. P S A PH D N TB. A P S T N D PHC. PH D N T A S PD. P S A T N D PHIt is crucial you not only memorize this and know what each layer does.2. What is encapsulation? CA. Putting the header on an incoming frameB. Putting a header on an incoming segmentC. Putting a header on an outgoing frameD. Putting a header on an outgoing bitThis also includes trailers and can be put on segments, packets, and frames.3. Which layer is most concerned with user applications? AA. ApplicationB. PresentationC. NetworkD. Physical4. Which of the following is de-encapsulation?AA. Stripping the header from a frameB. Putting a header on a segmentC. Putting a header on a frameD. Stripping a frame from a linkThis also includes trailers as in question 2.5. What layer converts data into segments? CA. ApplicationB. PresentationC. TransportD. Physical6. What layer converts data into Packets? AA. NetworkB. ApplicationC. PhysicalD. Data Link7. What layer converts data into Frames? CA. ApplicationB. PhysicalC. Data LinkD. Transport8. What layer converts data into bits? DA. ApplicationB. SessionC. Data LinkD. PhysicalAll of the layers need to convert data into something that they can pass down to the next level, with the exception of the Application layer which hands data to the Presentation layer.The Presentation layer encrypts, and compresses before sending it to the Session layer for it s first conversion.9. Which layer is most concerned with getting datafrom the beginning to the final destination? DA. ApplicationB. PresentationC. SessionD. TransportThe transport layer is most concerned with reliable transportation from one end to the other.10. Which of the following is not a part of the Session layer? BA. Establishing a sessionB. Ensuring error free segmentsC. Ending a sessionD. Keeping the sender and receiver from sending a message at the same time That is the job of the Transport layer.11. Which of the following is not a job for the presentation layer? Choose 2 CDA. Data representationB. CompressionC. Dialog managementD. TransmissionE. EncryptionC is handled by the session layer, andD is handled by the Transport layer12. What does Peer to Peer communication involve? DA. Each layer communication with the layer below itB. Each layer communication with layer above itC. Each layer communicating with adjacent layer in another systemD. Each layer communication with it s corresponding layer in another systemAnswer D.Answer C sounds correct also, but adjacent and corresponding are two different things. The session layer can only communicate with the session layer in another system for example.13. Why does the industry use a layered model?Choose all correct ABCDA. When you enhance one layer it doesn t affect the other layersB. Design and development can be made in a modular fashionC. Network operations can be simplifiedD. Troubleshooting can be simplified.14. Which two of the following are not from the physical layer? ADA. SDLCB. V.35C. HSSID. ISDNE. RS-232Answer A D.SDLC and ISDN are W AN protocols that function at the data link layer15. Which two answers are functions of the OSI model"s network layer? BCA. Sequencing of framesB. Path determinationC. Packet switchingD. Packet sequencingAnswer B C. Sequencing is done at the data link layer. D is fictional.16. What is an example of a MAC address? DA. Az32:6362:2434B. Sj:2817:8288C. GGG:354:665D. A625:cbdf:6525The address is a 48 bit address which requires 12 Hex digits.A hex digit can t be past the letter F. Hex stands for 16. 1-9 and A-F make up numbers that are valid.17. Which of the following is not part of the data link layer? EA. Transports data across the physical linkB. Performs physical addressingC. Performs flow controlD. Determines network topologyE. Terminates a sessionThis is part of the session layer18. Which of the following are data link protocols? ADEA. HDLCB. FTPC. SQLD. ISDNE. Token RingFTP is an application and SQL is a session layer protocol.19. Of the following address AA77:3827:EF54, which of the following is the vendor portion? AA. AA7738B. 27EF54C. AA77D. EF54The vendor code is how you can tell who made the card. The last 6 digits are the physical address.20. Which of the following are examples of layer 3 addressing? ABA. 165.33.4.34B. AA77:3827:EF54C. HHHH:hg:7654D. 76The first is a TCPIP address and the second is an IPX address21. What is considered Layer 3 addressing? BA. Data Link LayerB. Network LayerC. Application LayerD. None of thesePhysical is Layer 1, then data link, and then Network. This is the same layer that routers are on. A22. What layer are Bridges on?A. Data LinkB. PhysicalC. ApplicationD. TransportBridges segment networks but are not able to determine addresses like the network layer does.23. Repeaters are on what layer? CA. TransportB. SessionC. PhysicalD. ApplicationAll repeaters can do is boost a signal. An active hub is a good example of a repeater. A switching hub is a good example of layer 3 addressing, since switches go by network addresses and IPX addresses rather than just boost signals. Bridges can only read mac addresses, and not the full IPX or TCPIP addresses.24. Which of the following are considered routing protocols? ADA. OSPFB. IPC. IPXD. EIGRPE. Token RingAnswers B and C are routed protocols, whereas A and D are the protocols that do the routing. This is easily confused. You can remember it by thinking that the routing protocols that haul the routed protocols are like a tug ship pulling a barge. The barge is full of data.25. Which two of the following are considered connection oriented communication? ADA. Setup and maintenance procedures are performed to ensure message delieveryB. A physical circuit exists between two communicating devicesC. It is a best effort type of communicationD. A virtual connection exists between the twoB is not a necessity, andC is not accurate. TCP is connection oriented and UDP is not26. Which of the following are not WAN protocols? Choose 2 CDA. Frame RelayB. A TMC. EthernetD. FDDIE. ISDNEthernet and FDDI are LAN protocols.27. Which of the following will allow you to view NVRAM s contents? AEA. show configurationB. show protocolsC. show versionD. show running-configE. show startup-configAnswer A E. These show the backup configuration stored in NVRAM. The other anwsers allow youto view RAM.28. Which of the following contains the OS image? AA. FlashB. NVRAMC. RAMD. InterfacesROM will be used if Flash is unavailable. NVRAM is the backup configuration, and RAM is the active configuration29. Which of the following indicates the router is in privilege mode? AA. Router#B. Router>C. Router-D. Router* Answer B shows the router in user mode.30. What does "show cdp neighbors" not show? Neighbors___C______A. device idC. ios versionD. port type and number31. Which of the following will show you the clock? DA. cl?B. Cl ?C. Clock?D. Clock ?By typing this the router will finish the command and show the clock.32. CDP operates at which layer? DA. TransportB. NetworkC. Data linkD. PhysicalCDP allows a network device to exchange frames with other directly connected networked devices.33. Which command does not show two devices are not routing packets between them successfully? ACDA. pingB. show interfaceC. traceD. telnetAnswer A C D. With these commands you can tell whether or not you have communication. Show interface just verifies there is a connection34. What keystrokes shows the possible commands in privilege mode? ABA. helpB. hC. ctrl+hD. ?Answers A and B will give a brief description when typed, and C is not valid.35. Which two items contain versions of the router s configuration file? BCA. flashB. nvramC. ramD. romA and D contain the OS.36. Which of the following commands will allow you to review the contents of RAM?A. show configuration BCDC. show versionD. show running-configE. show startup-configA and E allow you to see NVRAM.37. Which of the following will allow you to add, modify, or delete commands in the startup configuration file? DA. show startup-configB. show running-configC. configure terminalD. configure memoryAnswer C allows you to change items in the running configuration file38. Which command would be used to restore a configuration file to RAM? ____A____TFTP running-configA. router#copyB. router>copyC. router*copyD. router^copyYou must be in privilege mode when executing this, which is why you see the # sign.39. Which of the following commands will display the running configuration file to a terminal? AA. show running-configB. show router-configC. router#show flashD. router>show versionIt can only be shown in privilege mode.40. If you need to copy the currently executing configuration file into NVRAM,which command would you use? CA. router#copy startup-config running-configB. router#copy startup-config TFTPC. router#copy running-config startup-configD. router>copy startup-config running-configAnswers ABC show that the router is in privilege mode which is necessary to complete this action, but only C shows the correct syntax.。
完整版CCNA测试题库及答案
完整版CCNA测试题库及答案描述载波侦听多路由访问/冲突检测（CSMA/CD）的工作原理。
CSMA/CD是一种帮助设备均衡共享带宽的协议，可避免两台设备同时在网络介质上传输数据。
虽然他不能消除冲突，但有助于极大的减少冲突，进而避免重传，从而提高所的设备的数据传输效率。
区分半双工和全双工通信。
并指出两种方法的需求。
与半双工以太网使用一对导线不同，全双工以太网使用两队导线，全双工使用不同的导线来消除冲突，从而允许同时发送和接收数据，而半双工可接收或发送数据，但不能同时接收和发送数据，且仍会出现冲突。
要使用全双工，电缆两端的设备都必须支持全双工，并配置成一全双模式运行。
描述MAC地址的组成部分以及各部分包含的信息。
MAC（硬件）地址时一种使用十六进制表示的地址，长48位（6B）。
其中前24位（3B）称为OUI（Organizationally Unique Idebtifier,组织唯一表示符），有IEEE分配给NIC制造商；余下的部分呢唯一地标识了NIC识别十进制数对应的二进制值和十六进制值。
用这三种格式之一表示的任何数字都可以转换为其他两种格式，能够执行这种转换对理解IP地址和子网划分至关重要。
识别以太网帧中与数据链路层相关的字段。
在以太网中，与数据链路层相关的字段包括前导码，帧其实位置分隔符，目标MAC地址，源MAC地址，长度或者类型以及帧校验序列。
识别以太网布线相关的IEEE标准。
这些标准描述了各种电缆类型的功能和物理特征，包括（但不限于）10Base2、10Base5和10BaseT。
区分以太网电缆类型及其用途。
以太网电缆分3种：直通电缆，用于将PC或路由器的以太网接口连接到集线器或交换机；交叉电缆。
用于将集线器连接到集线器，集线器连接到交换机，交换机连接到交换机以及PC连接到PC；反转电缆，用于PC和路由器或交换机之间建立控制台连接。
描述数据封装过程及其在分组创建中的作用。
数据封装指的是在OSI模型各层给数据添加信息的过程，也成为分组创建。
思科CCNA学习试题答案
思科CCNA学习试题答案CCNA课程测试一、单项选择题：1、介质100BaeT的最大传输距离是：()A:10mB:100mC:1000mD:500m2、路由器下，由一般用户模式进入特权用户模式的命令是：（）A：enableB:configC:interfaceD:router3、哪个命令可以成功测试网络：()A：Router>ping192.5.5.0B：Router#ping192.5.5.30C：Router>ping192.5.5.256D：Router#ping192.5.5.2554、介质工作在OSI 的哪一层（）A：物理层B：数据链路层C：网络层D：传输层5、100baeT的速率是()Mbit/A:1B:10C:100D:10006、在启用IGRP协议时，所需要的参数是：()A:网络掩码B:子网号C:自治系统号D:跳数7、基本IP访问权限表的表号范围是：()A:1—100B:1-99C:100-199D:800-8998、查看路由表的命令是：()A:howinterfaceB:howrunC:howiprouteD:howtable9、工作在OSI第三层的设备是：()A:网卡B:路由器C:交换机D:集线器10、OSI第二层数据封装完成后的名称是：()A:比特B:包C:帧D:段11、为了禁止网络210.93.105.0ftp到网络223.8.151.0，允许其他信息传输，则能实现该功能的选项是：()A：acce-lit1deny210.93.105.0.0.0.0.0.0B：acce-lit100denytcp210.93.105.00.0.0.255223.8.151.00.0.0.255eqftpC：acce-lit100permitipanyanyD：acce-lit100denytcp210.93.105.00.0.0.255223.8.151.00.0.0.255eqftpacce-lit100permitipanyany12、路由器下“特权用户模式”的标识符是：()A:>B:!C:#D:(config-if)#13、把指定端口添加到VLAN的命令是：() A:vlanB:vlan-memberhipC:vtpD:witchport14、交换机工作在OSI七层模型的哪一层()A:物理层B:数据链路层C:网络层D:传输层15、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16、交换机转发数据到目的地依靠()A:路由表B:MAC地址表C:访问权限表D:静态列表17、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:DDR18、VLAN主干协议VTP的默认工作模式是()A:服务器模式B:客户端模式C:透明模式D:以上三者都不是19、路由器的配置文件tartup-config存放在()里A:RAMB:ROMC:FLASHD:NVRAM20、配置路由器特权用户“加密密码”的命令是：()A:pawordB:enablepawordC:enableecretD:pawd21、某网络中，拟设计10子网，每个子网中放有14台设备，用IP地址段为199.41.10.某，请问符合此种规划的子网掩码是()A:255.255.255.0B:255.255.240.0C:255.255.255.240D:255.248.0.022、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23、扩展IP访问权限表的表号范围是：()A:1—100B:1-99C:100-199D:800-89924、把访问权限表应用到路由器端口的命令是：()A:permitacce-lit101outB:ipacce-group101outC:applyacce-lit101outD:acce-cla101out25、混合型协议既具有“距离矢量路由协议”的特性，又具有“链路状态路由协议”的特性，下列协议中属于混合型协议的是：()A：RIPB：OSPFC：EIGRPD：IGRP26、在路由器上，命令howacce-lit的功能是（）：A:显示访问控制列表内容B:显示路由表内容C:显示端口配置信息D:显示活动配置文件27、RIP路由协议认为“网络不可到达”的跳数是：()A:8B:16C:24D:10028、查看E0端口配置信息的命令是：()A:howacce-litB:howiprouteC:howverionD:howinterfacee029、配置路由器时，封装PPP协议的命令是：()A:encappppB:pppC:grouppppD:intppp30、路由器上“水平分割”的功能是：()A:分离端口B：阻止路由环路C：简化配置D：方便故障处理31、OSI七层模型中，“包”是哪一层数据封装的名称（）A：物理层B：数据链路层C：网络层D：传输层32、OSI七层模型中，“段”是哪一层数据封装的名称（）A：物理层B：数据链路层C：网络层D：传输层33、备份路由器IOS的命令是：()A:copyflahtftpB:copyrunning-configtftpC:copyIOStftpD:copytartup-configtftp34、PPP工作在OSI的哪一层（）A：物理层B：数据链路层C：网络层D：传输层35、FTP工作在OSI哪一层（）A：会话层B：表示层C：传输层D：应用层36、TELNET工作在OSI哪一层（）A：会话层B：表示层C：传输层D：应用层37、SMTP工作在OSI哪一层（）A：会话层B：表示层C：传输层D：应用层38、IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的子网号为（）A：192.168.50.32B：192.168.80.64C：192.168.50.96D：192.168.50.7139、IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的广播地址为（）A：192.168.50.32B：192.168.80.64C：192.168.50.96D：192.168.50.7140、IP地址为：192.168.50.70，掩码为：255.255.255.248，则该A：createB:interfaceC:encapulationD:ipaddre75、路由器上，命令“howint0”的显示结果为：Serial0iup,lineprotocolidown出现该结果的可能原因是（）A：端口处于关闭状态B：物理端口被烧毁C：两端设备协议不一致D：路由表中无路由76、如果把路由器的某个端口的IP配置为：192.168.10.64，掩码配置为：255.255.255.248，则该端口（）A：能和其他设备正常通信B：会变成“adminitrativelydown”状态C：端口被烧毁D：出现错误提示，配置命令执行失败77、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”78、能够分配给设备的IP，应该是（）A：网络有效IPB：网络号C：网络广播地址D：任意IP79、路由器“全局模式”的提示符为（）A:>B:#C:(config)#D:(config-router)#80、路由器当前的模式为“端口模式”，要退回到“特权模式”，应该使用的快捷键为（）A：ctrl+bB:ctrl+zC:ctrl+cD:ctrl+p81、下列命令中，无法正确执行的是（）A：Router(config)#howrunB:Router#ping127.0.0.1C:Router(config)#hotn amecicoD:Router#reload82、路由器上，设置端口速率的命令是（）A：clockrateB:bandwidthC:etD:encap83、路由器上，清空路由表的命令是（）A：clearipB:deleteiprouteC:deleterouteD:cleariproute某84、路由表中，某条路由的“路由代码为D”，则表明该路由为（）A：直连路由B：静态路由C：IGRP路由D：EIGRP路由85、两台路由器直连到一起，应该使用的线缆为（）A：交叉线缆B：直通线缆C：反转线缆D：任意线缆86、通过路由器的“配置端口conole”对路由器进行配置，应该使用的线缆为（）A：交叉线缆B：直通线缆C：反转线缆D：任意线缆87、下面对Cico2621路由器和Cico2501路由器描述中，错误的是（）A：Cico2621路由器的可扩展性优于Cico2501路由器B：Cico2621是模块化路由器C：Cico2501上提供一个100Mbit/的快速以太网端口D：Cico2501是固定端口的路由器88、为了连接“帧中继”线路，网络中的路由器需要提供的端口类型为（）A：FatEthernetB:SerialC:BRID:Ethernet89、路由器“特权模式”的提示符是：（）A：>B：#C：(config)#D:(config-if)#90、下列关于路由器和交换机的描述中，错误的是（）A：路由器可以用来连接internet B：二层交换机可以用来实现“异地网络”互连C：路由器可以用来做路径选择D：交换机可以转发广播二、多项选择题：正确答案的个数在每题的题后括号中有说明91、在路由器上，可以使用的命令有：()[选3个]A：pingB：howinterfaceC：howiprouteD：ipconfigE：wincfg92、在配置帧中继子接口时，在物理接口上应该配置的内容是：()[选3个]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93、请选出交换机处理帧的三种模式：()[选3个]A：直通模式B：存储转发模式C：侦测模式D：分段模式E：阻塞模式94、对于IP为199.41.27.0，子网掩码为255.255.255.240，则该IP地址和子网掩码相作用会得到一系列IP，从下列选项中选出属于“有效IP”的选项：()[选3个]A：199.141.27.33B：199.141.27.112C：199.141.27.119D：199.141.27.126E：199.141.27.175F：199.141.27.20895、属于私有IP 段的是()[选3个]A：10.0.0.0-10.255.255.255B：172.16.0.0-172.31.255.255C：202.110.100.0-202.110.100.255D：192.168.0.0-192.168.255.255E：126.0.0.0-126.255.255.25596、下列哪一设备工作时，要用到OSI的七个层（一层到七层）（）[选3个]A：PCB：网管机C：WEB服务器D：交换机E：路由器97、网络中经常使用DDN服务，请选出DDN的优点（）[选3个]A：传输质量高B：接入方式灵活C：偷占带宽D：使用虚电路E：专用线路98、网络中经常使用“帧中继”服务，请选出帧中继的优点（）[选3个]A：偷占带宽B：提供拥塞管理机制C：可以使用任意广域网协议D：灵活的接入方式99、默认情况下，IGRP衡量路径好坏时，考虑的因素为（）[选2个]A：带宽B：可靠性C：最大传输单元D：延时100、交换机的三大功能为（）[选3个]A：地址学习B：转发过滤C：消除回路D：发送数据包。
CCNA基础知识考题汇总.doc
1、OSI模型包括哪7层？答：从上到下分别为：应用层、表示层、会话层、传输层、网络层、数据链路层、物理层2、TCP/IP模型包括哪4层？答：从上到下分别为：过程/应用层、主机到主机层、因特网层、网络接入层3、思科组网模型包括哪3层？答：核心层、汇聚层、接入层4、TCP与UDP有何区别？答：1. TCP是基于全双工的、血向连接的、可靠传输协议，而UDP是无连接、不可靠传输协议。
2、TCP采用的是虚电路方式，而UDP不采用虚电路。
3、TCP的数据段格式与UDP的数据段格式不一样4、TCP含有窗口流量控制，而UDP没有5、TCP如何实现传输的可靠性？答：建立起虚电路连接的“三次握手”原则这是由于TCP的数据段格式而决定了TCP能进行面向连接的可靠传输。
6、DHCP服务提供了哪些内容？答：IP地址、子网掩码、域名、默认网关、DNS. WINS信息Windows杳看木机ARP信息的命令是什么？答：arp-a7、Windows跟踪路径的命令是什么？答：Traceroute8、Windows长ping并改变包大小的命令是什么？答:ping -1 size +ip 地址.9、Windows 5看木机路由表的命令是什么？答：show ip route10、IP地址分成哪两个部分？答：ip地址分成主机地址和网络地址11、如何快速计算某个IP所在的网络地址及广播地址？答：划分了网就需要计算了网掩码和分配相应的主机块，采用十进制计算方法。
12、VLSM及Cl DR的全称是什么？答：VLSM是变长了网掩码；CIDR是无类的内部域路由13、WWW、FTP、DNS、Telnets POP3、SMTP、远程桌面这些应用分别使用的TCRUDP的哪些端口？答： www端口： 80> ftp 端口： 21 dns 端口： 53telnet 端口： 23 pop3 端口： 110 smtp 端口： 25 windows终端（远程桌面）端口： 338914、电脑对路由器交换机输入配置命令的途径有哪两种？15、笔记木电脑上没有OOM端口时如何连接路由器交换机的console 口？答：用一个USB转换com端口器16、路由器模拟成PC需要哪些配置？答：router （config） #no ip routingrouter （config） #ip default-gateway *・*.*.*router（config）#int f*/*router （conf ig-if）#ip address *.*.*.*. （了网掩码）*.*.*.*router（confi-if）#no shutdown17、静态路由有哪两种写法？答：1、router （config） #ip route （目的地址）*.*.*.* （子网掩码）*.*.*.* （下一跳地址）*. *. *. *2、Router （config） #ip route （0 的地址）*.*.*.* （了网掩码）*.*.*.* （本路由器的夕卜出接口）f*/*18、如何配置/32的主机静态路由？19、静态路由、RIP、日GRP、OSPF的默认管理距离是多少？答：静态路由的ad是1 rip的ad是120 eigrp的ad是90 ospf的ad是11020、默认路由和静态路由并存时，如何选路？答：静态21、静态路由配置后，进入路由表的条件是什么？答：1、接口存在，并且是激活的；2、下一跳可达22、PC-R1-R2-R3-Server,为了让PC访问Server, 3台路由雅最少共需要配置儿条静态路由？答：至少4条静态路由23、静态路由如何修改管理距离？答：ip route目地ip地址了网掩码下一跳地址/本地出接口后直接加要修改的AD号（0-255）24、RIP、EIGRP、OSPF的全称分别是什么？答：路由信息协议、增强内部网关路由协议、开放最短路径优先25、RIP协议属于哪种类型的路由协议，这种类型的路由协议有何特点？答：属于动态路由协议；其特点是能较好地适应网络状态的变化，但实现起来较为复杂, 开销也比较大。
CCNA认证考试真题.doc
CCNA认证考试真题（1）TCP/IP Addressing and Protocol1: Your junior network administrator wants to know what the default subnet mask is for a Class C IP address. What do you tell him?A. 255.0.0.0B. 255.255.0.0C. 255.245.255.0D. 255.255.255.0E. 255.255.255.2552: An application needs to have reliable, end-to-end connect-ivity. Which of the following protocols will give you reliable connectivity?A. TCPB. UDPC. IPD. ICMP3: You are designing a network, which needs to support 55 users. You don't plan to extend the segment beyond the currentnumber of users. Which subnet mask would best meet your needs?A. 255.255.0.0B. 255.255.255.0C. 255.255.255.192D. 255.255.255.1604: You have added a new switch to your network. You want to manage it remotely, so you need to assign it an IP address. Your router that connects to the switch has an IP address of 172.16.12.33/27. Which of the following addresses can you assign to this switch?A. 172.16.12.33/28B. 172.16.12.32/27C. 172.16.12.33/27D. 172.16.12.34/27E. 172.16.12.35/28F. 172.16.12.38/28G. 172.16.12.63/275: The address 172.16.208.16/20 is a host address in which of the following subnets?A. 172.16.176.0–255.255.240.0B. 172.16.192.0–255.255.240.0C. 172.16.208.0–255.255.240.0D. 172.16.224.0–255.255.240.06: You are designing an IP address scheme for your brand new remote office. The vice president of IT calls to tell you that you will be in charge of the 192.168.1.64/26 subnetwork. This supplies you with a single subnetwork with 62 hosts. You need to have at least two subnets with 14 hosts in each subnet. What custom subnet mask should you use?A. 255.255.255.128B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.2487: You have subnetted the 210.106.14.0 network with a /24 mask. Your boss at Acme, Inc. wants to know how many usable subnetworks and usable host addresses per subnet this would provide. What should you tell her?A. One network with 254 hostsB. Two networks with 128 hostsC. Four networks with 64 hostsD. Six networks with 30 hosts8: Identify three valid host addresses in any subnet of the 201.168.27.0 network, assuming a fixed subnet mask of 255.255.255.240. (Choose three.)A. 201.168.27.33B. 201.168.27.112C. 201.168.27.119D. 201.168.27.126E. 201.168.27.175F. 201.168.27.2089: What is the subnetwork address for a host with the IP address 201.100.5.68/28?A. 201.100.5.0B. 201.100.5.32C. 201.100.5.64D. 201.100.5.65E. 201.100.5.31F. 201.100.5.110: Which of the following protocols uses a three-way handshake mechanism to establish sessions?A. TCPB. IPC. UDPD. IPXE. Frame relay11: Which of the following protocols is connection-oriented?A. TCPB. IPC. IPXD. Frame relay12: You are using an application on your Windows 2000 client machines that provides error correction. You need a protocol to provide fast transport. Which protocol should your application use?A. TCPB. IPC. UDPD. SPXE. AppleTalk13: When using TCP, after a session is open, the applications can adjust the number of segments they receive before sending an acknowledgment. This behavior is known as ______________.A. MTU adjustmentB. WindowingC. Flexible Send PathD. FCS14: If the destination did not receive a segment, how will the TCP host know to resend the information?A. The ACK received will not include the segment number that was not received.B. The ACK received will include the segment number that was not received.C. The sending host will send a PACK to verify segment receipt.D. The destination host will send a YACK message back to the sending host.15: You are planning on using a single network that supports 208 users. Which IP address class would you choose to be the most efficient?A. Class AB. Class BC. Class CD. Class DE. Class E16: RFC 1918 defines the private IP address ranges. Which of the following IP addresses are considered part of these ranges? (Choose three.)A. 10.23.45.67B. 126.21.34.56C. 172.16.32.1D. 172.31.234.55E. 192.169.4.517: A new network is being designed for your company, Acme,Inc. If you use a Class C IP network, which subnet mask will provide one usable subnet per department while allowing enough usable host addresses for each department specified in the table?DepartmentNumber of UsersCorporateCustomer SupportFinancialEngineeringA. 255.255.255.0B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.24818: Which of these protocols provides data transport, relying on the error correction capabilities of the application itself?A. UDPB. TCPC. SNMPD. ICMP19: Which of the following are used by TCP to ensure reliable delivery of data? (Choose two.)A. MAC address resolutionB. Sequence numbersC. AcknowledgmentsD. PingE. Routing updates20: You discover that you are able to adjust the window size of the TCP segment. You increase the window size to test the results. What will you observe happening on your network?A. Increased throughputB. Decreased throughputC. Increased latencyD. Decreased reliability21: Your organization is using the 192.168.1.0/24 address space. You need 28 subnets. What subnet mask would you use to create these subnets?A. 255.255.255.0B. 255.255.255.128C. 255.255.255.192D. 255.255.255.224E. 255.255.255.240F. 255.255.255.24822: Which of the following protocols maps IP addresses to MAC addresses for connectivity to occur between two hosts?A. ARPB. RARPC. SLARPD. DHCP23: Your junior network administrator cannot seem to ping a host in another network and asks you why it isn't working. Which of the following is not an answer that you would give him?A. The host's default gateway is down.B. The destination host is not powered on.C. The IP address of the router interface is incorrect.D. The IP address of the switch to which the destination host connects is incorrect.E. The host is in a different subnet.24: Which of the following classes of IP addresses is utilized for multicasting?A. Class AB. Class BC. Class CD. Class D25: You give your IT department a spreadsheet of IP addresses and their subnets. You receive a call from one of the junior techs asking what the /26 means next to the IP addresses. You tell her:A. It represents the number of hosts possible on that subnetwork.B. It represents the number of subnetworks that are being used.C. It represents the class of IP address being used.D. It represents the number of bits in the subnet mask that are 1.26: You are given an IP network of 192.168.5.0 and told that you need to separate this network into subnetworks that can support a maximum of 16 hosts per subnet. This will help alleviatecongestion on the network. What subnet mask can you use to create the subnets necessary to meet the given criteria?A. 255.0.0.0B. 255.255.0.0C. 255.255.255.0D. 255.255.255.224E. 255.255.255.24027: Which of the following would a Class A network be assigned to?A. Government agencyB. Small-to-medium sized corporationC. SOHOD. An individual28: A client has the IP address 192.168.5.98/27. Which of the following addresses are on the same subnet as this host? (Choose two.)A. 192.168.5.95B. 192.168.5.100C. 192.168.5.128D. 192.168.5.11029: Which of the following IP addresses is not a public IP address that can be routed over the Internet?A. 2.3.4.5B. 11.12.13.14C. 165.23.224.2D. 172.31.45.34E. 203.33.45.2230: You are given a Class B network. What is the default subnet mask assigned to the Class B network?A. 255.255.255.255B. 255.255.0.0C. 255.224.0.0D. 0.0.0.031: You are troubleshooting your router's interfaces. For some reason, the Ethernet interface will not accept the IP address of 192.168.5.95/27 that you've assigned. Which of the following explains the router's refusal to take the IP address?A. Class C addresses cannot be assigned to Ethernet interfaces.B. The /27 is an invalid mask.C. It is a broadcast address.D. It is a public IP address.E. It is a private IP address.32: You are a network technician at Acme, Inc. You are required to divide the 172.12.0.0 network into subnets. Each subnet must have the capacity of 458 IP addresses. Also, according to the requirements, you must provide the maximum number of subnets. Which subnet mask should you use?A. 255.255.255.254B. 255.255.254.0C. 255.255.240.254D. 255.255.0.033: What is the subnetwork and broadcast IP address of 192.168.2.37 with the subnet mask of 255.255.255.248?A. 192.168.2.24/192.168.2.31B. 192.168.2.32/192.168.2.39C. 192.168.2.40/192.168.2.47D. 192.168.2.48/192.168.2.55E. 192.168.2.56/192.168.2.6334: One of your co-workers at Acme, Inc., needs to convert the binary number 11011010 into a decimal. What is the decimal equivalent?A. 218B. 219C. 220D. 221E. 22235: One of your co-workers at Acme, Inc., needs to convert the binary number 01011010 into a decimal. What is the decimal equivalent?A. 75B. 83C. 90D. 9736: One of your co-workers at Acme, Inc., needs to convert the binary number 11010110 into a decimal. What is the decimal equivalent?A. 198B. 214C. 252D. 25537: One of your co-workers at Acme, Inc., needs to convert the binary number 10110110 into a decimal. What is the decimal equivalent?A. 182B. 192C. 202D. 21238: You are configuring a subnet for the Acme, Inc., branch office in Beijing. You need to assign IP addresses to hosts in this subnet. You have been given the subnet mask of 255.255.255.224. Which of these IP addresses would be valid? (Choose three.)A. 15.234.118.63B. 92.11.178.93C. 134.178.18.56D. 192.168.16.87E. 201.45.116.159F. 217.63.12.19239: You are a network technician at Acme, Inc. You have subnetted the 208.98.112.0 network with a /28 mask. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router is using ip subnet-zero?A. 62 networks and 2 hostsB. 6 networks and 30 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hostsE. 16 networks and 14 hosts40: What is a disadvantage of using a connection-oriented protocol such as TCP?A. Packet acknowledgment might add overhead.B. Packets are not tagged with sequence numbers.C. Loss or duplication of data packets is more likely to occur.D. The application layer must assume responsibility for the correct sequencing of the data packets.41: You are a network technician at Acme, Inc. You have subnetted the 192.168.72.0 network with a /30 mask for connections between your routers. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router cannot use ip subnet-zero?A. 62 networks and 2 hostsB. 6 networks and 30 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hostsE. 14 networks and 14 hosts42: Which of the following IP addresses are considered "network" addresses with a /26 prefix? (Choose two.)A. 165.203.2.0B. 165.203.5.192C. 165.203.6.63D. 165.203.6.191E. 165.203.8.25543: Identify three valid hosts in any subnet of 192.168.32.0, assuming the subnet mask used is 255.255.255.240. (Choose three.)B. 192.168.32.112C. 192.168.32.119D. 192.168.32.126E. 192.168.32.175F. 192.168.32.20844: A Class C network address has been subnetted with a /27 mask. Which of the following addresses is a broadcast address for one of the resulting subnets?A. 198.57.78.33B. 198.57.78.64C. 198.57.78.97D. 198.57.78.97E. 198.57.78.159F. 198.57.78.25445: What is the subnetwork address for a host with IP address 165.100.5.68/28?A. 165.100.5.0C. 165.100.5.64D. 165.100.5.65E. 165.100.5.31F. 165.100.5.146: Your boss wants to know what TCP stands for. What do you tell him?A. Transmission Check ProtocolB. Transport Check ProtocolC. Transmission Control ProtocolD. Transport Control Protocol47: Your boss wants to know what UDP stands for. What do you tell him?A. Unreliable Data ProtocolB. Unreliable Data ProgramC. User-Defined ProtocolD. User Datagram Protocol48: Which of the following statements accurately describesUDP?A. UDP copies files between a computer and a system running rshd, the remote shell service (daemon).B. UDP is a member of the TCP/IP suite of protocols that governs the exchange of electronic mail between message transfer agents.C. UDP is a member of the TCP/IP suite of protocols and is used to copy files between two computers on the Internet. Both computers must support their respective roles: one must be a client, and the other a server.D. UDP is a TCP complement that offers a connectionless datagram service guaranteeing neither delivery nor correct sequencing of delivered packets (much like IP).49: Which of the following host addresses are members of networks that can be routed across the public Internet? (Choose three.)A. 10.20.12.64B. 172.16.32.129C. 172.64.32.34D. 192.168.23.252E. 196.104.12.95F. 214.192.48.25450: You are connecting your Serial 0/1 interface to the Internet. Which of the following need to be done for the connection to work? (Choose two.)A. Assign a public IP address.B. Use the shutdown command.C. Use the no shutdown command.D. Make sure the interface is running in full-duplex.（2）Basic IOS Configuration1: In which of the following modes in Cisco's IOS can you issue show commands? (Choose two.)A. UserB. PrivilegedC. Line ConfigurationD. Global Configuration2: Yo u are the network administrator for a large corporation. You want to be able to store all your configurations in a centralized location. Which of these servers will allow you to do so? (Choose two.)A. FTPB. TFTPC. SQLD. Oracle3: You need to troubleshoot your network IP connectivity. Which of the following commands would you use to find the IP address on your Ethernet 0 interface?A. pingB. IPConfigC. tracerouteD. Show interface Ethernet 04: Which command would you use at the CLI in User mode to enter Privileged EXEC mode?A. PrivilegeB. AdminC. EnableD. Disable5: You have just received 14 Catalyst switches for your network. You would like to install these switches into your productionnetwork to provide separate collision domains for each of the connected devices. What configuration is required to provide this functionality?A. No configuration is required.B. You must set up an IP address on the switch.C. You must configure unique VLANs on the switches.D. You must install the Cisco IOS.6: Which of the following prompts indicates your router is in Privileged EXEC mode?A. Router>B. Router#C. Router&D. Router$7: You have made a console connection to your Cisco Catalyst switch and you see the > symbol in HyperTerminal. What does it mean?A. You are in Privileged EXEC mode.B. You are in User EXEC mode.C. The switch has not been configured.D. The switch is in need of repairs.8: You would like to assign a meaningful name to your Catalyst switch. What command should you use?A. enableB. host nameC. hostnameD. name9: You need to assign an IP address to your Catalyst 2950 switch. You are at the HQ_SW1> prompt. What is the correct series of commands? (cr = carriage return)A. enable ip address 10.1.1.1B. enable ip address 10.1.1.1 255.255.255.0C. enable configure terminal ip address 10.1.1.1 255.255.255.0D. enable configure terminal interface vlan 1 ip address10.1.1.1 255.255.255.010: Which of the following commands displays the syntax for the clock command?A. cl?B. clock?C. clock ?D. cl ?11: Which of the following commands allows you to configure a welcoming message whenever you log in to a router?A. Router(config)# banner messageB. Router(config)# banner motd &C. Router# banner motd #D. Router# banner message !12: You need to connect to your 2621XM router to configure an interface. Which of the following methods allows you to connect to and issue commands on the router? (Choose three.)A. TelnetB. FTPC. Console connectionD. AUX connection13: You want to prevent unauthorized users from plugging their laptops into the router. What type of password helps prevent this issue?A. vtyB. InterfaceC. ConsoleD. Enable14: You have connected to the console port and are running HyperTerminal. You see only scrambled characters and symbols. What is the most likely solution to this problem?A. Change the connectors.B. Use a different Terminal program.C. Reset the router.D. Adjust the baud rate of your COM port.[View full size image]15: Which of the following commands would you type to receive this output shown in the figure above?A. Show running-configB. Show startup-configC. Show ip routeD. Show version16: You are configuring a router named East for authentication with a router named West using CHAP. What username should youconfigure on East to allow the routers to communicate?A. EastB. WestC. SouthD. North17: What is the default point-to-point encapsulation protocol used on a Cisco router?A. PPPB. SLIPC. HDLCD. ATM18: What type of handshake occurs with CHAP authentication?A. One-wayB. Two-wayC. Three-wayD. Mutual19: You have connected to your Cisco router through a Telnet connection. To test one of your connections, you use a debug ippacket command. Even though you are sure traffic is passing through your router, nothing is reported in your terminal window. What is the most likely cause of this problem?A. There is no debug ip packet command.B. You need to type in the terminal monitor command to see debug output from a Telnet session.C. This command displays information only if the interface experiences trouble. No output indicates that the interface is fine.D. Cisco routers do not allow you to enable debug commands remotely due to security restrictions.[View full size image]20: Which of the following commands would you type to see this output on your Cisco router shown in the previous figure?A. Show versionB. Show running-configC. Show startup-configD. Show router setup21: Which of the following commands would you type to see this output shown in the figure above?A. Show interface Ethernet 0/0B. Show ip interface detailC. Show interface Serial 0/1D. Show ip interface brief22: Your routers at ACME, Inc., are having some connectivity issues. You issue show commands for each connecting router's interface. Why are they unable to communicate (see figures above)?A. Incorrect IP addressB. Wrong routing protocolC. Bad cableD. Encapsulation mismatch23: You need to back up the configurations you just made, but no TFTP servers are available. Which of the following commands are options to back up your currently running configuration? (Choose two.)A. Router1#copy running-config startup-configB. Router1#copy running-config flashC. Router1#copy startup-config running-configD. Router1#copy running-config http24: You are consulting a small business that is establishing itsfirst WAN link. The client wants to know what encapsulation you will be using on the link. Which of the following are valid encapsulations for WAN links? (Choose three.)A. Frame relayB. EthernetC. Token ringD. PPPE. HDLC25: Your boss is concerned about security on your network. She wants to make sure that no one can identify passwords if he or she happens to view a configuration on your router. What command encrypts all passwords on your router?A. Router1#service password-encryptionB. Router1(config)#service password-encryptionC. Router1#enable secret passwordD. Router1(config)#enable secret password26: You need to set up a password that will prevent unauthorized users from telnetting into your router. What series of commands would you use?A. Acme1(config)# line console 0Acme1(config-line)# password acmeAcme1(config-line)# loginB. Acme1(config)# line vty 0Acme1(config-line)# enable password acmeC. Acme1(config)# line vty 0Acme1(config-line)# enable secret acmeAcme1(config-line)# loginD. Acme1(config)# line vty 0Acme1(config-line)# password acmeAcme1(config-line)# login27: When you are setting up your serial interfaces, what does the clockrate command do for your connection?A. Establishes the timing at which you send dataB. Establishes keepalivesC. Establishes the advertised bandwidthD. Establishes the time on the router28: You need to set up passwords on all your default Telnet lines. What command would you start with?A. Router1(config)#telnet configurationB. Router1(config)#interface Ethernet 0/1C. Router1(config)#line vty 1 5D. Router1(config)#line vty 0 429: You can execute show commands at which prompt? (Choose two.)A. Router1#B. Router1(config)#C. Router1(config-router)#D. Router1>E. romon1>30: You are configuring your router and type in an Enable password and an Enable Secret password. Your fellow network technician asks you why you have two passwords set when you need only one. What do you tell him?A. The Enable password is used by low-level applications.B. If you reverted to an older version of the IOS, it would not understand the Secret password.C. Both passwords are treated the same.D. It is a failsafe method of ensuring that people need to type two passwords instead of just one.31: You need to get back to Privileged EXEC mode from Interface Configuration mode. What is the quickest method?A. Ctrl+Shift+6; then press XB. Ctrl+EscC. Ctrl+ZD. Type exit32: When you are establishing a PPP link, which of the following would be negotiated? (Choose three.)A. IPCPB. CHAPC. UDPD. Q.931E. Multilink Protocol33: Which of the following commands returns your router to a previously saved configuration?A. Router1#setupB. Router1#copy running-config startup-configC. Router1#copy startup-config running-configD. Router1#reload34: You are in Interface Configuration mode and would like to recall the last command you typed, move your cursor to the beginning of the command line, and type no before the recalled command. You notice your up- and down-arrow keys do not function because you are using an older terminal program. What command combinations could you use to recall the previous command and move your cursor to the beginning of the line?Press Ctrl+P to recall the previous command and Ctrl+A to move to the beginning of the command line.Press Ctrl+L to recall the previous command and Ctrl+B to move to the beginning of the command line.Press Ctrl+D to recall the previous command and Ctrl+A to move to the beginning of the command line.Press Ctrl+E to recall the previous command and Ctrl+A to move to the beginning of the command line.35: What is the baud rate setting for your terminal emulation program so that you can communicate through your console port?A. 2400B. 9600C. 14400D. 3630036: What must be configured on a Cisco device to enable Telnet functionality?A. A management IP addressB. SNMPC. CDPD. vty ports37: You are configuring your Cisco router and need to go back to User EXEC mode. What command takes you back to User EXEC mode?A. Router1#enableB. Router1#exitC. Router1#configure terminalD. Router1#disable38: Which of the following commands places an IP address on your Catalyst switch?A. Switch1#ip address 10.2.2.2 255.255.255.0B. Switch1(config)#Set IP 10.2.2.2 255.255.255.0C. Switch1(config-vlan)#ip address 10.2.2.2D. Switch1(config-vlan)#ip address 10.2.2.2 255.255.255.039: Which of the following commands would you enter to receive this output shown in the figure above?A. Router1#show NVRAMB. Router1#show FlashC. Router1#show Flash-MemD. Router1#show V ersion40: Your senior network administrator is unable to telnet to a Catalyst switch because she forgot the IP address. You have physical access and are able to console in. Which of the following commands is the best to get the IP address on the switch?A. Switch1#show ipB. Switch1#show vlan 1C. Switch1#show ip routeD. Switch1#show interface vlan141: You have powered up your Cisco 3640 router. The first thing you see is this output. Which of the following statements about this screen is accurate (see figure above)?A. Your IOS is corrupt and unable to load.B. Your configuration is missing parameters.C. You do not have a configuration saved in NVRAM.D. You have typed setup in the Privileged mode.42: You type in a command and are shown the following output:% Ambiguous command: "show con"What does this mean?A. You did not enter enough characters for your device to recognize the command.B. You did not enter all the keywords or values required by this command.C. You entered the command incorrectly.D. Context-sensitive help is unable to helbreak.B. The router truncates the command because commands longer than one line are not allowed.C. The router automatically scrolls the line to the left and uses a dollar sign ($) to indicate that there is text to the left of the $.D. The router shortens all the commands to squeeze thecommand on to the screen.44: You want to change the size of the command history buffer. Which of the following commands will set it permanently to 100?A. Router1#terminal history 100B. Router1#history size 100C. Router1(config)#terminal history 100D. Router1(config-line)#history size 10045: You have configured a description on your serial interfaces. Which of the following commands displays the description? (Choose two.)A. Show running-configB. Show flashC. Show interfacesD. Show ip protocols46: You are typing commands into your Cisco IOS on your 3640 router. However, your typing is consistently interrupted by console messages, forcing you to retype. Which of the following commands forces the IOS to retype your original input after it displays the console message?A. Exec-timeoutB. Logging synchronousC. Line consoleD. Exec message readout47: You are configuring a router and issue the command interface ethernet 1/0/0. What do the numbers represent?A. Slot/port/interfaceB. Slot/interface/portC. Port/slot/port numberD. Slot/port adapter/port number48: Which of the following commands correctly sets the physical speed of a serial interface to 64Kbps?A. Router1(config-if)#bandwidth 64B. Router1(config-if)#bandwidth 64000C. Router1(config-if)#clockrate 64D. Router1(config-if)#clockrate 6400049: In what mode do you use the encapsulation command?A. Interface Configuration modeB. Sub-interface Configuration modeC. User modeD. Privileged mode50: You are configuring your router, and your boss happens to look over your shoulder as you type a show running-config command. She sees one of the lines that says password 7 14361F009A056E7D and asks what this means. What do you tell her?A. It is the actual password.B. It is the result of a service password-encryption command.C. The console output made a mistake.D. It is the result of an enable secret command.。
思科认证CCNP经典试题
思科认证CCNP经典试题CCNP经典题目第一部分填空题1、在Cico体系的IGP协议中，RIP的A-D管理距离是，EIGRP的域内A-D管理距离是，EIGRP的域外A-D管理距离是OSPF的A-D管理距离是。
BGP从EBGP学习到的路由学到路由的A-D管理距离是;BGP从IBGP学习到的路由学到路由的A-D管理距离是。
2、BGP的默认MED值为；其中MED越越优选被用于选路；BGP从邻居哪里学到的权重为；BGP自己本路由产生的路由（始发路由）产生权重是；BGP的默认本地优先级为：。
3、BGP的邻居分为和。
4、OSPF在那个区域（有区域0，区域1，区域2）广播多路访问（比如以太网，没有出现外部网络），在区域0可以看到类LSA。
如果想看到2类LSA，必须在网络类型；在NSSA区域可以看到类LSA，在纯粹的NASS区域内是否有5类LSA？（回答是或者否）。
5、HSRP包括哪六种状态？6、OSPF在MA网络链路类型的HELLO报文作用？（3种）7、IPV6的本地链路地址是；本地站点地址是。
（没有/10的写法）8、在选择STP的角色（身份）有哪些？，默认STP的收敛时间为。
配置了portfat后，收敛时间会小于。
9、OSPF发送hello包的组播地址是，EIGRP组播地址是；HSRP发送hello包组播地址是；VRRP发送hello包的组播地址是。
10、目前以太通道最多可以使用条物理线缆逻辑捆绑成一个以太通道接口？形成以太通道方式有。
11、BGP在EBGP中使用属性避免AS间的环路（确保无环），该属性属于BGP的必遵属性，其中还有哪两个是BGP公认必遵属性为和。
第二部分选择1、在对基于CEF的多层交换（MLS）进行排错的时候，例如解决无法到达特定的IP目标等问题，首先需要先查看哪两张表去验证错误？（）A、IP路由表和路由表B、IP路由和CEF邻接关系表C、TCAM中的IPCEFFIB和邻接关系表D、IP路由表和ARP表2、EIGRP位一个混合距离矢量协议，在METRIC值中使用K1-K5五个K值，默认情况下，使用K值分别是（）A、K1，K2BK3,K4C、K1，K5D、K1，K33、OSPF中router-id能标识一台设备的身份，下面说法正确的是（）A、先选举手工配置，然后选择设备loopback地址大的，在选运行了宣告进OSPF最大的物理接口最大的地址。
CCNA考试题
CCNA考试题一、选择题（每题5分）1、具有第 3 层功能的以太网交换机有哪两项关键功能？（选择两项。
）（）A、第 3 层路由功能B、网络地址转换(NA T)C、与远程网络和设备建立远程访问连接D、广播流量管理和组播流量管理E、采用边界网关协议(BGP) 进行自治系统(AS) 间路由2、第 2 层以太网交换机有哪三项功能？（选择三项。
）（）A、防止广播B、增大每名用户可用的带宽C、减小冲突域的大小D、在网段间隔离流量E、在不同的网络间路由流量F、减少广播域的数量3、分层网络设计模型中的哪一层称为互连网络的高速主干层，其中高可用性和冗余性是该层的关键？（）A、接入层B、分布层C、网络层D、核心层E、工作组层F、 W AN 层4、分层网络设计模型中的哪一层提供了将设备接入网络的途径并控制允许那些设备通过网络进行通信？（）A、应用层B、接入层C、分布层D、网络层E、核心层5、在处于不同的VLAN 中的设备间配置通信需要使用OSI 模型中的哪个层？（）A、第 1 层B、第 3 层C、第 4 层D、第 5 层6、推荐同时在核心层和分布层采用哪种分层设计特征以在发生路由故障时保护网络？（）A、交换B、冗余C、聚合D、访问列表7、为支持客户端关联过程，802.11 标准中指定了哪两种身份验证方法？（选择两项。
）（）A、轻型可扩展身份验证协议(EAP)B、共享密钥C、高级加密标准(AES)D、临时密钥完整性协议(TKIP)E、开放式身份验证8、传统路由与单臂路由器有何区别？（）A、传统路由只能使用单个交换机接口。
单臂路由器可使用多个交换机接口。
（）B、单臂路由器使用子接口将多个逻辑网络连接到单个路由器端口。
传统路由在每个逻辑网络中使用一个端口。
C、传统路由使用路由协议来向其它路由器更新路由。
单臂路由器仅将数据路由到直连网络。
D、单臂路由器不提供多个连接，因此消除了使用STP的需要。
传统路由使用通向路由器的多条路径，因此需要STP。
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1. Which encapsulation type is a Frame Relay encapsulation type that is supported by Cisco routes？
A. IETF
B. HDLC
C. Q9333-A Annex A
D. ANSI Annex D
答案A
2.Which two statements about using the CHAP authentication mechanism in a PPP link are true?(choose two)
A. CHAP uses a two-way handshake
B. CHAP authentication periodically occurs after link establishment
C. CHAP has no protection from playback attacks
D. CHAP authentication is performed only upon link establishment
E. CHAP uses a three-way handshake
F. CHAP authentication passwords are sent in plaintext
答案BE
3.
Refer to the exhibit,The VLAN configuration of S1 is not being in this VTP enabled environment.The VTP and uplink port configurations for each switch are displayed.Which two command sets,ifissued,resolve this failure and allow VTP to operate as expected?(choose two)
A. S2(config)#vtp mode transparent
B. S1(config)#vtp mode client
C. S2(config) #interface f0/24
S2(config-if) #switchport mode access
S2(config-if) #end
D. S2(config)#vtp mode client
E. S1(config)#interface f0/24
S1(config-if)#switchport mode trunk
S1(config-if)#end
答案BE
4.
Refer to the exhibit.Whydose the telnet connectin fail when a host attempts to connect a remote router?
A. No password was set for tty lines
B. No password was set for aux lines
C. No password was set for vty lines
D. No password was set for cty lines
答案C
5.Which three statements about EIGRP are true?(choose three)
A.EIGRP converges fast RIP because of DUAL and backup routes thatare storedin the topology table.
B.EIGRP uses a hello protocol to establish neighbor relationships
C.EIGRP uses split horizon and reverse poisoning to avoid routing loops.
D.EIGRP uses periodic updates to exchange routing information
E.EIGRP allows routers of different manufacturers to interoperate 答案ABC
6.Which Cisco IOS diagnostics command can disrupt the operation of
a router under high-load conditions?
A.show running-config
B.show processes cpu
C.debug all
D.logging host ip address
答案：C
7.Which command encrypts all plaintext passwords?
A.Router(config)#password-encryption
B. Router(config)#service password-encryption
C. Router#service password-encryption
D. Router# password-encryption
答案：B。