2023年CCNA考试真题答案分析

Cisco CCNA 认证考试最新真题体验1. The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command?A.This command should be executed from the global configuration mode.B.The IP address 10.121.16.8 is the local router port used to forward data.C.102 is the remote DLCI that will receive the information.D.The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC2. While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist?A.the session layerB.the network layerC.the data link layerD.the access layer3. In order to allow the establishment of a Telnet session with a router, which set of commands must be configured?A.router(config)# line console 0router(config-line)# enable password ciscoB.router(config)# line console 0router(config-line)# enable secret ciscorouter(config-line)# loginC.router(config)# line console 0router(config-line)# password ciscorouter(config-line)# loginD.router(config)# line vty 0router(config-line)# password cisco router(config-line)# login4. On point-to-point networks, OSPF hello packets are addressed to which address?A.127.0.0.1B.192.168.0.5C.224.0.0.5D.254.255.255.2555. What should be part of a comprehensive network security plan?A.Allow users to develop their own approach to network security.B.Physically secure network equipment from potential access by unauthorized individualsC.Encourage users to use personal information in their passwords to minimize the likelihood of passwords being forgottenD.Delay deployment of software patches and updates until their effect on end-user equipment is well known and widely reported6. During startup, the router displays the following error message:boot: cannot open "flash:" What will the router do next?A.Because of damaged flash memory, the router will fail the POST.B.It will attempt to locate the IOS from a TFTP server. If this fails, it will initiate the setup dialogC.It will attempt to locate the IOS from a TFTP server. If this fails, it will load a limited IOS from ROM.D.It will attempt to locate the configuration file from a TFTP server. If this fails, it will initiate the setup dialog7. At which OSI layer is a logical path created between two host systems?A.sessionB.transportworkD.physical8. A routing protocol is required that supports:1) routing update authentication2) an addressing scheme that conserves IP addresses3) multiple vendors4) a network with over 50 routersWhich routing protocol fulfills these requirements?A.RIPv1B.RIPv2C.EIGRPD.OSPF9. When a new trunk is configured on a 2950 switch, which VLANs by default are allowed over the trunk link?A.no VLANsB.all VLANsC.only VLANs 1 - 6D.only the VLANs that are specified when creating the trunk10. Which protocol provides a method of sharing VLAN configuration information between switches?A.VTPB.STPC.ISLD.802.1QDBDCB CCDBA博主的更多文章>>CCNA第一学期《Final Examination》2009-02-27 08:58:47 标签：CCNA[推送到技术圈]1请参见图示。

1 CCNA认证基础考卷参考答案（A卷）考试时间年月日(120分钟) 课程CCNA基础教师签名_____一、选择题（每题2分，共30分）二、名词解释（每题2分，共10分）三、简单题（每题15分，共60分）1、答：2、答：物理拓扑是指介质的实际布局。

常见的物理拓扑有总线型、环形、星型、扩展星型、树型、网状等逻辑拓扑是指主机访问介质的方法。

常见的有总线型和令牌环型。

3、答UTP线缆分为直连线、交叉线、全反线直连线按照568B的线序标准应该是两端相同，都为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕，一般用于主机到交换机、主机到集线器、路由器到交换机、路由器到集线器等。

交叉线按照568B的线序标准应该是两端的1-3、2-6交叉，一端为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕，另一端为白绿、绿、白橙、蓝、白蓝、橙、白棕、棕；一般用于同样类型的两台设备直连一级集线器到交换机，主机到路由器的连接。

全反线的线序为两端线序完全相反，一端为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕，另一端则线序全部相反，为棕、白棕、绿、白蓝、蓝、白绿、橙、白橙。

全反线只用于计算机的串口与网络设备的控制台端口连接。

4、答：相同点：1)路由器和第3层交换机都是第3层的设备2)路由器和第3层交换机都具有路由功能3)路由器和第3层交换机都能够提供子网（或VLAN）间的通信4)路由器和第3层交换机都主要用于主干网上不同点：1)接口工作层次：路由器的接口只工作在第3层（路由接口）上，第3层交换机的接口可独自工作在第2层（交换接口）或第3层（路由接口）上。

2)软硬件实现：路由器是基于软件的路由设备，第3层交换机是硬件化的路由设备3)转发性能：路由器实现高转发性能的代价远高于第3层交换机4)接口类型：路由器的接口类型远丰富于第3层交换机5)路由能力：路由器的路由能力强大，第3层交换机的路由能力只需满足一般需要即可。

（路由协议、转发机制）6)应用场合：广域主干网中一般使用路由器，园区主干网中通常使用第3层交换机一、填空(每空2分，共20分)1如图所示，路由器A和B已经配置使用RIP作为动态路由协议，且路由器A和B上的所有接口都报告“interface is up, line protocol is up”。

思科CCNA学习试题答案CCNA课程测试一、单项选择题：1、介质100BaseT的最大传输距离是：( )A: 10m B:100m C:1000m D: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：enable B:config C: interface D:router3、哪个命令可以成功测试网络：( )A： Router> ping 192.5.5.0B： Router# ping 192.5.5.30C： Router> ping 192.5.5.256D： Router# ping 192.5.5.2554、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、100baseT的速率是( )Mbit/sA: 1 B:10 C:100 D: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—100 B:1-99 C:100-199 D:800-8998、查看路由表的命令是：( )A:show interface B:show run C:show ip route D:show table9、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210.93.105.0 ftp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：access-list 1 deny 210.93.105.0.0.0.0.0.0B：access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.00.0.0.255 eq ftpC：access-list 100 permit ip any anyD：access-list 100 deny tcp 210.93.105.0 0.0.0.255 223.8.151.0 0.0.0.255 eq ftpaccess-list 100 permit ip any any12、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: vlan B: vlan-membership C: vtp D:switchport14、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:NAT B:VLAN C:ACCESS-LIST D: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startup-config存放在( )里A:RAM B:ROM C:FLASH D:NVRAM20、配置路由器特权用户“加密密码”的命令是：( )A:password B:enable password C:enable secretD:passwd21、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.X ，请问符合此种规划的子网掩码是( ) A: 255.255.255.0 B:255.255.240.0C: 255.255.255.240 D: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—100 B:1-99 C:100-199 D:800-89924、把访问权限表应用到路由器端口的命令是：( )A: permit access-list 101 out B: ip access-group 101 out C: apply access-list 101 out D: access-class 101 out 25、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： RIP B： OSPF C：EIGRP D： IGRP26、在路由器上，命令show access-list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: 8 B:16 C:24 D:10028、查看E0端口配置信息的命令是：( )A:show access-list B:show ip routeC:show version D:show interface e029、配置路由器时，封装PPP协议的命令是：( )A:encap ppp B:ppp C: group ppp D: int ppp30、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: copy flash tftpB: copy running-config tftpC: copy IOS tftpD: copy startup-config tftp34、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：192.168.50.32 B：192.168.80.64C：192.168.50.96 D：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：192.168.50.32 B：192.168.80.64C：192.168.50.96 D：192.168.50.7140、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有效IP为（）A：192.168.50.33---192.168.50.39B：192.168.50.41---192.168.50.50C：192.168.50.65---192.168.50.70D：192.168.50.66---192.168.50.7541、IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP和掩码结合，共划分了多少个子网（不包括全0子网和全1子网）（）A： 8 B：30 C：6 D：1442、IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP和掩码结合划分子网时，每个子网的容量为（）A：8 B：4 C：12 D：643、网络172.12.0.0需要划分子网，要求每个子网中有效IP数为458个，为了保证子网数最大，则掩码应为（）A：255.255.255.0 B：255.255.254.0 C：255.255.0.0D：255.255.248.044、哪一个命令可以设置路由器特权用户的“明文密码”（）A：enable password B:password C:enable secretD: secret45、RIP协议的管理距离是（）A：100 B：110 C：120 D：15046、下列路由协议中，属于链路状态路由协议的是（）A：RIP B：EIGRP C：IGRP D：OSPF47、默认情况下，RIP定期发送路由更新的时间是（）A：15S B：30S C：60S D：90S48、如果网络中的路由器都是cisco路由器，则优先选择哪一个路由协议（）A：RIP B：EIGRP C：IGRP D：OSPF49、下列对RIP的配置中，合法的命令是（）A： router rip 100network 10.12.0.0B： router rip 100network 10.0.0.0C： router ripnetwork 10.12.0.0D： router rip 100network 10.0.0.050、为了查看路由器的E0端口上，是否挂接了访问权限表，应该使用的命令是（）A：show access-list B:show interface e0C: show ip interface e0 D:show e051、关于帧中继的说法，正确的是（）A：速率最大为1Mbit/s B: 不提供差错校验功能C：可以偷占带宽 D：数据传输质量高于DDN52、关于PPP和HDLC的说法中，错误的是（）A：PPP是通用协议，HDLC是CISCO私有协议B：PPP有验证功能，HDLC无验证功能C：PPP效率低，HDLC效率高D：在配置ISDN时，广域网协议不能封装成PPP，但可以封装成HDLC 53、对交换机的描述，正确的是（）A：单广播域，单冲突域的设备B：单广播域，多冲突域的设备C：多广播域，单冲突域的设备D：多广播域，多冲突域的设备54、对路由器的描述，正确的是（）A：单广播域，单冲突域的设备B：单广播域，多冲突域的设备C：多广播域，单冲突域的设备D：多广播域，多冲突域的设备55、交换机上VLAN的功能描述中，正确的是（）A：可以减少广播域的个数B：可以减少广播对网络性能的影响C: 可以减少冲突域的个数D: 可以减小冲突域的容量56、两个VLAN之间要想通信，应该使用的设备是（）A：集线器 B：二层交换机C：路由器 D：PC机57、要把交换机的配置文件保存到tftp服务器，应使用的命令为（）A：copy ios tftp B:copy running-config tftpC: copy flash tftp D:copy config tftp58、命令“ping 127.0.0.1”的功能是（）A：测试网卡是否正常 B：测试网关是否正常C：测试TCP/IP协议是否正常 D：测试介质是否正常59、路由器上的命令“show version”的功能是（）A：显示版本信息 B：显示端口配置信息 C：显示路由表D：显示路由协议信息60、路由器上激活端口的命令是（）A：shutdown B:no shutdown C: up D:no up61、某台PC，能ping通路由器，但不能telnet到路由器，可能的原因是（D ）A：PC的IP地址设置错误 B：路由器端口IP设置错误C：路由器端口处于关闭状态D：telnet密码未设置62、OSI七层模型中，网络层的数据封装名称为（）A：比特 B：帧C：包 D：段63、OSI七层模型中，物理层的数据封装名称为（）A：比特 B：帧 C：包 D：段64、OSI七层模型中，数据链路层的数据封装名称为（）A：比特B：帧 C：包 D：段65、OSI七层模型中，传输层的数据封装名称为（）A：比特 B：帧 C：包D：段66、帧中继环境下，为了区分虚电路，应该使用的地址是（）A：IP地址 B：MAC地址 C：DLCI D：IPX地址67、路由器“路由模式”的提示符号是（）A: # B: (config)# C:(config-if)# D:(config-router)# 68、EIGRP 的管理距离（）A：90 B：100 C：110 D：12069、RIP协议负载均衡的路径数量为（）A：无限制B：最多4条C：最多5条D：最多6条70、下面有关交换机的描述中，正确的是（）A：所有交换机都支持VLAN功能B：交换机端口数量最多为48口C：交换机独占带宽D：交换机端口的最大速率为100Mbit/s71、为了阻止交换机环路，交换机上所采用的技术为（）A：水平分割B：生成树协议C：触发更新D：地址学习72、帧中继环境中，CIR的含义是（）A：提高线路速率B：保证线路速率C：降低线路速率D：配置线路速率73、路由器上端口fa0/0,其最大传输速率是（）Mbit/sA：128 B: 10 C:100 D: 100074、帧中继环境中，在物理端口上，建立子接口的命令是（）A：create B:interface C:encapsulation D:ip address 75、路由器上，命令“show int s0”的显示结果为：Serial0 is up , line protocol is down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“administratively down”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IP B：网络号 C：网络广播地址 D：任意IP 79、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+b B: ctrl+z C:ctrl+c D:ctrl+p81、下列命令中，无法正确执行的是（）A：Router(config)#show runB: Router#ping 127.0.0.1C: Router(config)#hostname ciscoD: Router#reload82、路由器上，设置端口速率的命令是（）A：clock rate B:bandwidth C:set D:encap83、路由器上，清空路由表的命令是（）A：clear ip B:delete ip route C:delete routeD: clear ip route *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console”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Cisco2621路由器和Cisco2501路由器描述中，错误的是（）A：Cisco2621路由器的可扩展性优于Cisco2501路由器B：Cisco2621是模块化路由器C：Cisco2501上提供一个100Mbit/s的快速以太网端口D：Cisco2501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：FastEthernet B:Serial C:BRI D: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internetB：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：ping B：show interfaces C：show ip route D：ipconfig E：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：199.141.27.33 B：199.141.27.112 C：199.141.27.119D：199.141.27.126 E：199.141.27.175 F：199.141.27.208 95、属于私有IP段的是( )[选3个]A：10.0.0.0-10.255.255.255B：172.16.0.0-172.31.255.255 C：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：PC B：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。

C C N A考试题(总9页) -CAL-FENGHAI.-(YICAI)-Company One1-CAL-本页仅作为文档封面，使用请直接删除第一部分：选择题1：提供可靠数据传输、流控的是OSI的第几层（）A、表示层B、网络层C、传输层D、会话层E、链路层2：子网掩码产生在那一层（）A、表示层B、网络层C、传输层D、会话层3：当路由器接收的IP报文的目的地址不是本路由器的接口IP地址，并且在路由表中未找到匹配的路由项，采取的策略是（）A、丢掉该分组B、将该分组分片C、转发该分组D、以上答案均不对4：当一台主机从一个网络移到另一个网络时，以下说法正确的是（）A、必须改变它的IP地址和MAC地址B、必须改变它的IP地址，但不需改动MAC地址C、必须改变它的MAC地址，但不需改动IP地址D、MAC地址、IP地址都不需改动5：ISO提出OSI的关键是（）A、系统互联B、提高网络速度C、为计算机制定标准D、经济利益6：OSI参考模型按顺序有哪些层（）A、应用层、传输层、网络层、物理层B、应用层、表示层、会话层、网络层、传输层、数据链路层、物理层C、应用层、表示层、会话层、传输层、网络层、数据链路层、物理层D、应用层、会话层、传输层、物理层7：LAN的拓扑形式一般以（）为主。

A、总线型B、环型C、令牌环D、载波侦听与冲突检测CSMA/CD8：网段地址154.27.0.0的网络，若不做子网划分，能支持（）台主机A、254B、1024C、65,534D、16,777,2069：路由器网络层的基本功能是（）。

A、配置IP地址B、寻找路由和转发报文C、将MAC地址解释成IP地址10：选出基于TCP协议的应用程序（）。

A、PINGB、TFTPC、TELNETD、OSPF11：某公司申请到一个C类IP地址，但要连接6个的子公司，最大的一个子公司有26台计算机，每个子公司在一个网段中，则子网掩码应设为（）。

A、255.255.255.0B、255.255.255.128C、255.255.255.192D、255.255.255.22412：B类地址的缺省掩码是（）。

第一章：正确答案：2.4.5•解析：由于不需要使用网络设备和专用服务器，对等网络易于创建，复杂性更低，且成本更少。

而且对等网络也没有集中管理。

这种网络安全性更低，不可扩展，而且那些同时充当客户端和服务器的设备可能性能更差正确答案：1解析：正确答案： 3.5解析：选择网络介质的条件包括：所选介质可以成功传送信号的距离、要安装所选介质的环境、必须传输的数据量和速度以及介质和安装的成本。

正确答案：3和4解析：终端设备上的应用程序可以生成数据，更改数据内容并且负责启动封装过程。

正确答案：1和4解析：终端设备会发出通过网络传输的数据。

中间设备会在链路发生故障时通过备用路径传输数据，并且会过滤数据传输以增强安全性。

网络介质提供网络消息的传输通道。

正确答案：4解析：外联网是公司外部的人或企业合作伙伴访问数据的网络区域。

内部网只描述通常仅供内部人员访问的网络区域。

当设备连接到有线网络时，有线LAN 会受BYOD（自带设备）影响。

使用大学无线LAN 的设备多为平板电脑和智能手机。

大学生主要使用无线WAN 来访问他们的手机运营商网络。

.正确答案：2解析：由于通过Internet 可以联系在线供应商，所以家庭用户通过Internet 进行网上购物。

内联网基本上是仅供内部使用的局域网。

外联网是外部合作伙伴访问组织内部特定资源的网络。

家庭用户并不一定使用LAN 来访问Internet。

例如，PC 可以通过调制解调器直接连接到ISP。

正确答案：1解析：内部网这个术语用于表示一个组织的私有局域网和广域网连接。

内部网的设计旨在仅允许该组织的成员、员工或其他获得授权的人员进行访问。

正确答案：2和4解析：电缆和DSL 均能实现高带宽、始终联网，并提供到主机计算机或LAN 的以太网连接。

10正确答案：2和3解析：移动电话连接需要使用移动电话网络。

卫星连接通常用于家庭或企业外部不便使用物理布线的位置。

11正确答案：2解析：当对网络资源的请求超出了可用容量时，网络就会变得拥堵。

2023年CCNA考试真题2023年CCNA考试正式开考啦！本次考试涉及网络技术的基础知识，将对考生的技术水平进行全面考察。

下面是本次考试的真题，希望能够帮助考生更好地复习。

【第一部分：选择题】（共10题，每题2分，共计20分）1. OSI模型中，位于网络层的协议是：A. TCPB. IPC. HTTPD. UDP2. 下面哪个命令可以查看路由表信息：A. pingB. tracertC. ipconfigD. route print3. 在IP地址192.168.0.1/24中，/24表示什么意思：A. 子网掩码B. 路由器IP地址C. 网络IDD. 主机ID4. 下面哪个协议可以实现主机与交换机之间的通信：A. BGPB. ARPC. MPLSD. SNMP5. 下面哪个命令可以查看IP地址的连通性：A. telnetB. netstatC. pingD. tracert6. VLAN是指：A. 虚拟本地区域网络B. 可视化局域网C. 个人局域网D. 无线局域网7. 下面哪个设备可以实现不同局域网之间的互联：A. 集线器B. 路由器C. 交换机D. 网桥8. 下面哪个协议负责在网络中寻找设备的物理地址：A. ARPB. ICMPC. OSPFD. BGP9. 下面哪个命令可以查看交换机的端口信息：A. show ip interface briefB. show mac-address-tableC. show running-configD. show version10. 下面哪个协议可以实现安全的远程登录：A. FTPB. HTTPC. SSHD. Telnet【第二部分：填空题】（共5题，每题4分，共计20分）1. 在OSI模型中，位于物理层的设备是_________。

2. 在TCP/IP协议族中，位于传输层的协议是_________。

3. IP地址由_________位二进制数组成。

缩小范围
收集可疑设备的症状
分析现有症状
确定所有权
2逻
接口标识符
连接器类型
操作系统版本
电缆类型
虚电路
记录仅在园区网络中发现的设备的相关信息。

记录在整个网络中（包括远程站点）发现的设备的相关信息。

将网络配置表中与拓扑图所示组件相关的任何设备信息记录下来。

仅将网络配置表中与拓扑图所示组件相关的第
将网络配置表中与拓扑图所示组件相关的在网络使用高峰期收集的的设备信息记录下来。

检查所有服务器的电缆连接。

检查每块网卡上的连接指示灯是否为绿色。

在每台服务器上使用应用程序控制台来确保应用程序正在运行。

检查应用程序服务器上的事件日志，看是否有特定应用程序的错误消息。

测试客户端与服务器之间的
如果
在服务器上重新安装受影响的应用程序。

如果应用程序仍然无法响应，则在其中一台用户
6下
封装不正确
STP
ARP
时钟频率不正确
8全
数据中心中的超时传输现象表明存在本地物理层问题。

序以及电缆是否损坏。

因为所有客户端都遇到了应用程序问题，管理员应该对数据中心内的应用程序服务器使用自上而下问题的范围表明可能存在路由问题或生成树问题。

通过对员工进行调查以确定最近是否进行过更改。

10广12
14
极端工作条件下的预期性能
基线工具
知识库
协议分析器
电缆测试仪
18下
TCP/IP
TCP/IP
使用
网络接入层负责在
Internet
TCP/IP
20网。

以下是针对您未获得满分的试题给出的反馈。

某些交互式试题可能不显示您的答案。

分项分数：1与固定配置的交换机相比，模块化交换机具有哪两个优点？（请选择两项。

）正确响应您的响应每台交换机的成本更低可扩展性更高转发率更低需要的电源插座数目更少带宽聚合可以使用多个端口固定配置交换机价格较低，但是它具有指定数量的端口且不能添加端口。

它们提供的高速端口通常比较少。

为了在包含固定配置交换机的网络上扩展交换，需要购买更多的交换机。

这增加了需要使用的电源插座数量。

模块化交换机只需要购买额外的线卡便可以扩展。

带宽聚合也更容易，因为机箱的背板可以为交换机端口线卡提供所需的带宽。

此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.2 交换网络2思科无边界架构接入层的基本功能是什么？正确响应您的响应聚合第 2 层广播域聚合第 3 层路由边界为用户提供访问权提供高可用性思科无边界架构接入层的功能是为用户提供网络访问。

第 2 层广播域聚合、第 3 层路由边界聚合和高可用性是分布层的功能。

也有说答案是聚合第 3 层路由边界此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.1 融合网络3思科无边界架构分布层的基本功能是什么？正确响应您的响应充当主干聚合所有园区块聚合第 3 层路由边界为用户提供访问权思科无边界架构的分布层的一项基本功能是在不同的VLAN 之间路由。

充当主干和聚合园区块是核心层的功能。

为用户提供访问是接入层的功能。

此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.1 融合网络4若将大端口密度、容错和低价作为重要指标，应使用哪个交换机外形因素？正确响应您的响应固定配置交换机模块化交换机可配备机架的1U 交换机可堆叠式交换机堆叠式交换机可以使用特殊电缆实现互联，从而在交换机之间提供高带宽的吞吐量，并像单个大型交换机一样运行。

最新CCNA认证考试真题小编为大家收集整理了《最新CCNA认证考试真题》供大家参考，希望对大家有所帮助！！！（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. 255.255.255.255 2: 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. ICMP 3: You are designing a network, which needs to support 55 users. You don't plan to extend the segment beyond the current number of users. Which subnet mask would best meet your needs?A. 255.255.0.0B. 255.255.255.0C. 255.255.255.192D. 255.255.255.160 4: 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. 172.16.12.63/27 5: 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. 172.16.224.0–255.255.240.0 6: 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. 255.255.255.248 7: You have subnetted the 210.106.14.0 network with a /24 mask. Your boss at Acme, Inc. wants toknow 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 hosts 8: 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. 201.168.27.208 9: 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. 201.100.5.1 10: Which of the following protocols uses a three-way handshake mechanism to establish sessions?A. TCPB. IPC. UDPD. IPXE. Frame relay 11: Which of the following protocols is connection-oriented? A. TCPB. IPC. IPXD. Frame relay 12: You are using an application on your Windows 2000 client machines that provides errorcorrection. You need a protocol to provide fast transport. Which protocol should your application use?A. TCPB. IPC. UDPD. SPXE. AppleTalk 13: 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. FCS 14: 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 E 16: 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. 192.169.4.5 17: 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?Department Number of Users Corporate 7 Customer Support 15 Financial 13 HR 7 Engineering 16 A. 255.255.255.0B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.248 18: Which of these protocols provides data transport, relying on the error correctioncapabilities of the application itself?A. UDPB. TCPC. SNMPD. ICMP 19: 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 updates 20: 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. 255.255.255.248 22: Which of the following protocols maps IP addresses to MAC addresses for connectivity to occur between two hosts?A. ARPB. RARPC. SLARPD. DHCP 23: 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 D 25: 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 alleviate congestion 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. 255.255.255.240 27: Which of the following would a Class A network be assigned to?A. Government agencyB. Small-to-medium sized corporationC. SOHOD. An individual 28: A client has the IP address192.168.5.98/27. 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. 192.168.5.110 29: 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. 203.33.45.22 30: You are given a Class B network. Whatis the default subnet mask assigned to the Class B network?A. 255.255.255.255B. 255.255.0.0D. 0.0.0.0 31: 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. 255.255.255.254C. 255.255.240.254D. 255.255.0.0 33: What is the subnetwork and broadcast IP address of 192.168.2.37 with the subnet mask of255.255.255.248?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. 192.168.2.56/192.168.2.63 34: 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. 222 35: 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. 97 36: 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. 255 37: 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. 212 38: 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. 217.63.12.192 39: 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 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hostsE. 16 networks and 14 hosts 40: 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 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hostsE. 14 networks and 14 hosts 42: 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. 165.203.8.255 43: Identify three valid hosts in any subnet of 192.168.32.0, assuming the subnet mask used is 255.255.255.240. (Choose three.)A. 192.168.32.33B. 192.168.32.112C. 192.168.32.119D. 192.168.32.126E. 192.168.32.175F. 192.168.32.208 44: 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. 198.57.78.254 45: What is the subnetwork address for a host with IP address 165.100.5.68/28?A. 165.100.5.0B. 165.100.5.32C. 165.100.5.64D. 165.100.5.65E. 165.100.5.31F. 165.100.5.1 46: 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 Protocol 47: 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 Protocol 48: Which of the following statements accurately describes UDP?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. 214.192.48.254 50: 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 Configuration 2: 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. Oracle 3: 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 0 4: Which command would you use at the CLI in User mode to enter Privileged EXEC mode?A. PrivilegeB. AdminC. EnableD. Disable 5: You have just received 14 Catalyst switches for your network. You would like to install these switches into your production network 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. name 9: 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 10.1.1.1255.255.255.0D. enable configure terminal interface vlan 1 ip address10.1.1.1 255.255.255.0 10: 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 connection 13: 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. Enable 14: 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 version 16: You are configuring a router named East for authentication with a router named West using CHAP. What username should you configure on East to allow the routers to communicate?A. EastB. WestC. SouthD. North 17: What is the default point-to-point encapsulation protocol used on a Cisco router?A. PPPB. SLIPC. HDLCD. ATM 18: What type of handshake occurs with CHAP authentication?A. One-wayB. Two-wayC. Three-wayD. Mutual 19: You have connected to your Cisco router through a Telnet connection. To test one of your connections, you use a debug ip packet 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 someconnectivity 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 mismatch 23: 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 http 24: You are consulting a small business that is establishing its first 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. HDLC 25: 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 password 26: 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 0 Acme1(config-line)# password acme Acme1(config-line)# loginB. Acme1(config)# line vty 0 Acme1(config-line)# enable password acmeC. Acme1(config)# line vty 0 Acme1(config-line)# enable secret acme Acme1(config-line)# loginD. Acme1(config)# line vty 0 Acme1(config-line)# password acme Acme1(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 router 28: 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 4 29: 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 exit 32: When you are establishing a PPP link, which of the following would be negotiated? (Choose three.)A. IPCPB. CHAPC. UDPD. Q.931E. Multilink Protocol 33: 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#reload 34: 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. 36300 36: What must be configured on a Cisco device to enable Telnet functionality?A. A management IP addressB. SNMPC. CDPD. vty ports 37: 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#disable 38: 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 10.2.2.2 255.255.255.0 39: 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 Version 40: 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 help you with this command. 43: You are typing a command into the Cisco IOS.It is more than one terminal line long. What will the IOS do?A. The router automatically moves the cursor to the next line and uses a caret (^) to indicate the line break.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 the command 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 100 45: 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 protocols 46: 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 readout 47: 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 number 48: 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 64000 49: In what mode do you use the encapsulation command?A. Interface Configuration modeB. Sub-interface Configuration modeC. User modeD. Privileged mode 50: 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.。