CCNA1 Final Exam CCNA第一学期期末考试2011-10-10
CCNA第一学期各章习题及答案
诶了我累了目录第二章网络通信P2-8第三章应用层功能及协议P9-14第四章OSI传输层P15-20第五章OSI网络层P21-27第六章网络编址-IPv4 P28-34第七章数据链路层P35-40第八章OSI物理层P41-45第九章以太网P46-51第十章网络规划和布线P52-61第十一章配置和测试网络P62-70第一学期末考试P71-91文档末尾返回目录第二章网络通信001 TCP/IP 网络接入层有何作用？路径确定和数据包交换数据表示、编码和控制可靠性、流量控制和错误检测详细规定构成物理链路的组件及其接入方法将数据段划分为数据包002下列哪些陈述正确指出了中间设备在网络中的作用？（选择三项）确定数据传输路径发起数据通信重新定时和重新传输数据信号发送数据流管理数据流数据流最后的终止点003下列哪三项陈述是对局域网 (LAN) 最准确的描述？（选择三项）LAN 通常位于一个地域内。
此类网络由由一个组织管理。
LAN 中的不同网段之间一般通过租用连接的方式连接。
此类网络的安全和访问控制由服务提供商控制。
LAN 为同一个组织内的用户提供网络服务和应用程序访问。
此类网络的每个终端通常都连接到电信服务提供商 (TSP)。
004 什么是 PDU？传输期间的帧损坏在目的设备上重组的数据因通信丢失而重新传输的数据包特定层的封装005 OSI 模型哪两层的功能与 TCP/IP 模型的网络接入层相同？（选择两项）网络层传输层物理层数据链路层会话层006请参见图示。
所示网络属于哪一类型？WANMANLANWLAN007 以下哪种特征正确代表了网络中的终端设备？管理数据流发送数据流重新定时和重新传输数据信号确定数据传输路径008 第 4 层端口指定的主要作用是什么？标识本地介质中的设备标识源设备和目的设备之间的跳数向中间设备标识通过该网络的最佳路径标识正在通信的源终端设备和目的终端设备标识终端设备内正在通信的进程或服务009 请参见图示。
思科CCNA第一学期期末考试答案
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主机的默认网关。
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主机的首选域名服务器。
主机的主页IP地址
请参见图示。对图示拓扑可以得出哪两项结论？（选择两项）
下列哪个端口号范围为服务器上运行的应用程序常用的服务而保留？
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以下哪个OSI协议层提供面向连接的可靠数据通信服务? 应用层
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下列哪些是私有IP地址的地址范围？（选择三项。）
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ccna1章节及期末试题答案
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。
思科第一学期期末考试最新考题CCNA1备课讲稿
思科第一学期期末考试最新考题C C N A11Refer to the exhibit. Which Layer 2 protocol could be used inside nework A and network C?IPTCPUDPEthernet2Refer to the exhibit. Which set of devices contains only intermediary devices?A, B, D, GA, B, E, FC, D, G, IG, H, I, J3Refer to the exhibit. The headers added at each layer are shown. Which layer adds the destination and source process num ensure that data is delivered to the correct application?physical layerdata link layernetwork layertransport layer4The Layer 4 header contains which type of information to aid in the delivery of data?service port numberhost logical addressdevice physical addressvirtual connection identifier5Which fiber connector supports full-duplex Ethernet?6Which device should be used for routing a packet to a remote network?access switchDHCP serverhubrouter7Refer to the exhibit. Host A sends a frame to host C with a destination MAC address CC. The MAC address for host C is no table of switch SW1. How will SW1 handle the frame?Switch SW1 will drop the frame.Switch SW1 will forward the frame to host C.Switch SW1 will flood the frame out all ports.Switch SW1 will flood the frame out all ports except port Fa0/1.8Refer to the exhibit. A network technician has made several changes to R1 since the configuration has last been saved. Th configuration did not produce the desired changes. The technician wants to store a backup copy of the saved configuration server before reloading. Which action will cause the unmodified data to be saved on the TFTP server?9Which three statements are true about network layer addressing? (Choose three.)It uniquely identifies each host.It assists in forwarding packets across internetworks.It uses a logical 32-bit IPv4 address.It is not a configurable address.It is a physical address.It identifies the host from the first part of the address.10What is the result of using the clock rate 56000 command at the serial interface of the router?The interface is configured as a DCE device.The interface timers are cleared.The FastEthernet interface is made to emulate a serial interface by assigning it a timing signal.The IP address for the serial interface is configured.11Examine the graphic with current configurations. Host A in the Clerical office failed and was replaced. Although a ping to 12 successful, the replacement computer cannot access the company network. With proxy ARP disabled on the Fa0/0 interfacnetwork card failurenetwork cables unpluggedIP address incorrectly enteredsubnet mask incorrectly entered12As network administrator, what is the subnet mask that allows 510 hosts given the IP address 172.30.0.0?255.255.0.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0255.255.255.12813Which OSI layer uses a connection-oriented protocol to ensure reliable delivery of data?application layerpresentation layersession layertransport layer14 A network has grown too large for technicians to configure network addresses and hosts files for name resolution. Which twlayer services should be added to the server to allow these needs to be satisfied dynamically? (Choose two.)DNSFTPDHCPHTTPSMTP15Refer to the exhibit. Host A wants to access the Internet. Which combination of a Layer 2 address and a Layer 3 address w access from host A?Destination MAC: 0030.8596.DE83 Default gateway: 209.165.202.130Destination MAC: 0030.8596.DE82 Default gateway: 172.16.9.2Destination MAC: 0030.8517.44C4 Default gateway: 172.16.1.1Destination MAC: 0030.8517.44C4 Default gateway: 209.165.202.13016 A network administrator is asked to design a new addressing scheme for a corporate network. There are 60 users in the musers in the branch office, 28 users in manufacturing, 12 in the sales office, and 4 users in the research office. Which VLSM scheme that uses the 192.168.88.0/24 network will fulfill the requirements while wasting the fewest addresses?192.168.88.0/26 main192.168.88.32/26 branch192.168.88.64/26 manufacturing192.168.88.96/27 sales192.168.88.128/28 research192.168.88.0/26 main192.168.88.64/26 branch192.168.88.128/27 manufacturing192.168.88.160/28 sales192.168.88.176/29 research192.168.88.0/27 main192.168.88.32/27 branch192.168.88.64/28 manufacturing192.168.88.80/29 sales192.168.88.88/30 research192.168.88.0/27 main192.168.88.64/28 branch192.168.88.80/28 manufacturing192.168.88.96/29 sales192.168.88.104/30 research17Which physical connector type is used for a serial V.35 connection to the CSU/DSU?18Refer to the exhibit. Which two facts can be determined about the topology? (Choose two.)Four collision domains are present.One logical network is represented.Two broadcast domains are present.Three networks are needed.Three logical address ranges are required.19What are three characteristics of CSMA/CD? (Choose three.)It monitors the media for presence of a data signal.After detecting a collision, hosts can resume transmission after a random timer has expired.A jam signal is used to ensure that all hosts are aware that a collision has occurred.Devices can be configured with a higher transmission priority.Data is transmitted only when the data signal is present.It uses a token system to avoid collisions.20Refer to the exhibit. The serial interface of the router was configured with the use of the commands that are shown. The rou ping the router that is directly connected to interface serial 0/0/0. What should the network technician do to solve this probleConfigure the description at interface serial 0/0/0.Configure an IP address on interface serial 0/0/0.Remove the no shutdown command at interface serial 0/0/0Reboot the router.21Which OSI layer uses the header information to reassemble the data segments into streams?application layernetwork layerpresentation layersession layertransport layer22Refer to the exhibit. The NAT functionality of the router is enabled to provide Internet access to the PC. However, the PC is to access the Internet. Which IP address should be changed to 209.165.201.1 to enable the PC to access the Internet?192.168.1.191192.168.1.101192.168.1.1192.168.1.25423the IP address of the primary domain name server used by the host?10.10.10.32192.168.1.5192.168.1.99192.168.2.10024Which memory contents will change as a result of using the Router# erase startup-config command on a router?RAMROMflashNVRAM25While configuring a router, a network technician wants to name the router. Which prompt should the technician see when e hostname command?Router>Router#Router(config)#Router(config-line)#26Refer to the exhibit. The PC, the routing table of which is displayed, is configured correctly. To which network device or inte the IP address 192.168.1.254 belong?PCswitchrouter interface fa0/0router interface fa0/127Refer to the exhibit. A network administrator is troubleshooting a link that is down between Router1 and Router2. To correc which wire pairs need to be switched on one of the Ethernet cable ends?pair 1 and pair 2pair 1 and pair 3pair 2 and pair 3pair 2 and pair 428Refer to the exhibit. A PC is connected to a network. Which action will verify that the PC can communicate with its default gUse the ping 127.0.0.1 command.Use the ipconfig command.Use the ipconfig/all command.Use the ping 10.0.0.254 command.29Refer to the exhibit. Host B was powered off. What change will occur in the MAC table of the switch?The table will remain unaffected.The switch will remove the MAC address at Fa0/19.The switch will retain the MAC address until host B is powered on again.The switch will rebuild the MAC table by assigning the FFFF.FFFF.FFFF address to port Fa0/19.30What information is contained in the header of Layer 3 to help data delivery?port numberdevice physical addressdestination host logical addressvirtual connection identifier31 A network technician is tasked with setting up a network for six users, but the users should be able to use their accounts toany of the six computers. What type of network should be used?workgroupP2P applicationspeer-to-peer networkclient-server network32Refer to the exhibit. A web browser is running on host PC1 with an IP address 10.10.2.2/24. A dynamic port number of 491 assigned to the browser. The browser sends a request for a web page to the web server with an IP address 192.168.1.254 statement is true?The session is established using TCP, and the socket number for the web server is 192.168.1.254: 80.The session is established using TCP, and the socket number for the web server is 192.168.1.254: 49152.The session is established using UDP, and the socket number for the web server is 192.168.1.254: 80.The session is established using UDP, and the socket number for the web server is 192.168.1.254: 49152.33Refer to the exhibit. An administrator on PC1 wants to view some HTML code from a web page housed on the web server.application will allow this request to be started?34Refer to the exhibit. What is required on host A for a network technician to create the initial configuration on Router1?an FTP clienta Telnet clienta terminal emulation programa web browser35What are two characteristics of the data link layer? (Choose two.)It segments and reorders the data.It exchanges the frames between nodes.It defines the method by which network devices place data onto the media.It manages the transfer of data between the processes that run on each host.It retrieves signals from the media and restores them to their bit representations.36 A network administrator wants to restrict access to the router privileged EXEC mode. Which password should the administrenableauxconsoleVTY37Which three IPv4 addresses represent a broadcast for a subnet? (Choose three.)172.16.4.63 /26172.16.4.129 /26172.16.4.191 /26172.16.4.51 /27172.16.4.95 /27172.16.4.221 /2738Refer to the exhibit. Host X is unable to communicate with host Y. Which command can be run at host X to determine which intermediary device is responsible for this failure?telnet 192.168.1.1ping 192.168.1.1ftp 192.168.1.1tracert 192.168.1.139Refer to the exhibit. Which option shows the correct topology given the configuration of Router1?40If an administrator wished to return a router to the default state, what additional step must be taken after issuing the comma start-up config?Reload the device.Issue the command copy running-config start-up config.Perform a show running-config to verify that the file was removed.Enter the interface commands to allow the device to connect to the network.41By using the ipconfig command, a network administrator determines that a workstation has the address 192.168.3.38 with the subnet mask. To what network does the workstation belong?192.168.3.8192.168.3.16192.168.3.24192.168.3.3242Which statement is true about router hostnames?A hostname should be unique on each router.A router hostname cannot contain capital letters.A router hostname is configured in privileged executive mode.A router hostname must be created before any other configurations can be added to the device.43 A user types the enable command. What task can be performed at the privileged EXEC mode?Configure the device.Configure individual interfaces.Configure individual terminal lines.Issue show and debug commands.44Refer to the exhibit. Which logical topology describes the exhibited network?starringpoint-to-pointmulti-access45Refer to the exhibit. A user wants to access the Internet from the PC. A part of the running configuration of the router is sho default gateway IP address should be configured at the PC to enable this access?10.1.192.110.1.192.210.1.192.54192.31.7.146Which statement is true about the ICMP protocol?It is an application layer protocol.It is designed to make IP a reliable protocol.It is often filtered out of networks for security purposes.If a host does not respond to an ICMP echo request, the host is not functioning.47Refer to the exhibit. At which OSI layer is serial interface 0/0/1 experiencing problems?Layer 1Layer 2Layer 3Layer 448Refer to the exhibit. The host was disconnected from switch 2 and connected to switch 1. Which combination of IP address mask, and default gateway should be assigned to this host to allow it to function in the network?IP address: 10.10.9.37 Subnet mask: 255.255.255.240 Default gateway: 10.10.9.35IP address: 10.10.9.37 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.35IP address: 10.10.9.29 Subnet mask: 255.255.255.248 Default gateway: 10.10.9.35IP address: 10.10.9.32 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.35IP address: 10.10.9.37 Subnet mask: 255.255.255.224 Default gateway: 196.1.105.6IP address: 10.10.9.63 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.3549Refer to the exhibit. The diagram represents the process of sending email between clients. Select the list below that correc the component or protocol used at each numbered stage of the diagram.1.MUA2.MDA3.MTA4.SMTP5.MTA6.POP7.MDA8.MUA1.MUA2.POP3.MDA4.SMTP5.MTA6.MDA7.SMTP8.MUA1.MUA2.POP3.SMTP4.MDA5.MTA6.SMTP7.POP8.MUA1.MDA2.SMTP3.MTA4.SMTP5.MTA6.MUA7.POP8.MDA1.MUA2.SMTP3.MTA4.SMTP5.MTA6.MDA7.POP8.MUA50What is the Cisco IOS?system software for Cisco devicesRead Only Memory in Cisco devicesnon-volatile storage for device configurationsan initial operating system that is used for boot functions。
CCNA1全书练习题(所有章节chapter1至11)
CCNA Exploration: 网络基础知识 (版本 4.0)第2章1. TCP/IP 网络接入层有何作用？A．路径确定和数据包交换B. 数据表示、编码和控制C. 可靠性、流量控制和错误检测D. 详细规定构成物理链路的组件及其接入方法E. 将数据段划分为数据包2．在封装过程中，数据链路层执行什么操作？A. 不添加地址。
B. 添加逻辑地址。
C. 添加物理地址。
D. 添加进程的端口号。
3. 请参见图示。
下列哪组设备仅包含终端设备？A. A、C、DB. B、E、G、HC. C、D、G、H、I、JD. D、E、F、H、I、JE. E、F、H、I、J4. 下列哪些陈述正确指出了中间设备在网络中的作用？（选择三项）A. 确定数据传输路径B. 发起数据通信C. 重新定时和重新传输数据信号D. 发送数据流E. 管理数据流F. 数据流最后的终止点5. 下列哪三项陈述是对局域网 (LAN) 最准确的描述？（选择三项）A. LAN 通常位于一个地域内。
B. 此类网络由由一个组织管理。
C. LAN 中的不同网段之间一般通过租用连接的方式连接。
D. 此类网络的安全和访问控制由服务提供商控制。
E. LAN 为同一个组织内的用户提供网络服务和应用程序访问。
F. 此类网络的每个终端通常都连接到电信服务提供商 (TSP)。
6. 通过检查网络层报头可以确定什么？A. 本地介质上的目的设备B. 用于到达目的主机的路径C. 将要通过介质传输的比特D. 创建数据的源应用程序或进程7. 哪种设备被视为中间设备？A. 文件服务器B. IP 电话C. 笔记本电脑D. 打印机E. 交换机8. OSI 模型各层从最高层到最低层的正确顺序如何？A. 物理层、网络层、应用层、数据链路层、表示层、会话层、传输层B. 应用层、物理层、会话层、传输层、网络层、数据链路层、表示层C. 应用层、表示层、物理层、会话层、数据链路层、传输层、网络层D. 应用层、表示层、会话层、传输层、网络层、数据链路层、物理层E. 表示层、数据链路层、会话层、传输层、网络层、物理层、应用层9. 请参见图示。
ccna1章节与期末答案
第一章：ccna1章节与期末答案正确答案：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。
2011最新10月CCNA题库word版201~300题
QUESTION 201Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)A. amount of RAMB. bridge priorityC. IOS versionD. IP addressE. MAC addressF. speed of the linksQUESTION 202Refer to the exhibit. Assume that the routing protocol referenced in each choice below is configured with itsdefault settings and the given routing protocol is running on all the routers. Which two conditionalstatements accurately state the path that will be chosen between networks 10.1.0.0 and 10.3.2.0 for therouting protocol mentioned? (Choose two.)A. If OSPF is the routing protocol, the path will be from R1 to R3 to R4 to R5.B. If OSPF is the routing protocol, the path will be from R1 to R2 to R5.C. If OSPF is the routing protocol, the path will be from R1 to R5.D. If RIPv2 is the routing protocol, the path will be from R1 to R3 to R4 to R5.E. If RIPv2 is the routing protocol, the path will be from R1 to R5.QUESTION 203Refer to the exhibit. A network administrator is adding two new hosts to SwitchA. Which three values couldbe used for the configuration of these hosts? (Choose three.)A. host A IP address: 192.168.1.79B. host A IP address: 192.168.1.64C. host A default gateway: 192.168.1.78D. host B IP address: 192.168.1.128E. host B default gateway: 192.168.1.129F. host B IP address: 192.168.1.190QUESTION 204A network administrator changes the configuration register to 0x2142 and reboots the router. What are tworesults of making this change? (Choose two.)A. The IOS image will be ignored.B. The router will prompt to enter initial configuration mode.C. The router will boot to ROM.D. Any configuration entries in NVRAM will be ignored.E. The configuration in flash memory will be booted.QUESTION 205Refer to the exhibit. The networks connected to router R2 have been summarized as a 192.168.176.0/21route and sent to R1. Which two packet destination addresses will R1 forward to R2? (Choosetwo.)A. 192.168.194.160B. 192.168.183.41C. 192.168.159.2D. 192.168.183.255E. 192.168.179.4F. 192.168.184.45QUESTION 206Which three statements are typical characteristics of VLAN arrangements? (Choose three.)A. A new switch has no VLANs configured.B. Connectivity between VLANs requires a Layer 3 device.C. VLANs typically decrease the number of collision domains.D. Each VLAN uses a separate address space.CCNA考试报名1700元99艾迪飞论坛艾迪飞论坛E. A switch maintains a separate bridging table for each VLAN.F. VLANs cannot span multiple switches.QUESTION 207QoS policies are applied on the switches of a LAN. Which type of command will show the effects of thepolicy in real time?A. show commandB. debug commandC. configuration commandD. rommon commandQUESTION 208Which command will show the MAC addresses of stations connected to switch ports?A. show mac-addressB. show arpC. show tableD. show switchportQUESTION 209What is the name of the VTP mode of operation that enables a switch to forward only VTP advertisements while still permitting the editing of local VLAN information?A. serverB. clientC. tunnelD. transparentQUESTION 210Which port state is introduced by Rapid-PVST?A. learningCCNA考试报名1700元100艾迪飞论坛艾迪飞论坛B. listeningC. discardingD. forwardingQUESTION 211What speeds must be disabled in a mixed 802.11b/g WLAN to allow only 802.11g clients to connect?A. 6, 9, 12, 18B. 1, 2, 5.5, 6C. 5.5, 6, 9, 11D. 1, 2, 5.5, 11QUESTION 212Refer to the exhibit. Which VLSM mask will allow for the appropriate number of host addresses for NetworkA?A. /25B. /26C. /27D. /28QUESTION 213Refer to the exhibit. Which subnet mask will place all hosts on Network B in the same subnet with the leastamount of wasted addresses?A. 255.255.255.0B. 255.255.254.0C. 255.255.252.0D. 255.255.248.0QUESTION 214Refer to the exhibit. Which mask is correct to use for the WAN link between the routers that will provideconnectivity while wasting the least amount of addresses?A. /23B. /24C. /25D. /30QUESTION 215Refer to the exhibit. What is the most appropriate summarization for these routes?A. 10.0.0.0 /21B. 10.0.0.0 /22C. 10.0.0.0 /23D. 10.0.0.0 /24QUESTION 216CCNA考试报名1700元102艾迪飞论坛艾迪飞论坛Which two tasks does the Dynamic Host Configuration Protocol perform? (Choose two.)A. Set the IP gateway to be used by the network.B. Perform host discovery used DHCPDISCOVER message.C. Configure IP address parameters from DHCP server to a host.D. Provide an easy management of layer 3 devices.E. Monitor IP performance using the DHCP server.F. Assign and renew IP address from the default pool.QUESTION 217Which two benefits are provided by using a hierarchical addressing network addressing scheme? (Choosetwo.)A. reduces routing table entriesB. auto-negotiation of media ratesC. efficient utilization of MAC addressesD. dedicated communications between devicesE. ease of management and troubleshootingQUESTION 218Which two benefits are provided by creating VLANs? (Choose two.)A. added securityB. dedicated bandwidthC. provides segmentationD. allows switches to route traffic between subinterfacesE. contains collisionsWhich two link protocols are used to carry multiple VLANs over a single link? (Choose two.)A. VTPB. 802.1qC. IGPD. ISLE. 802.3uQUESTION 220Which two protocols are used by bridges and/or switches to prevent loops in a layer 2 network? (Choosetwo.)A. 802.1dB. VTPC. 802.1qD. STPE. SAPQUESTION 221On the network 131.1.123.0/27, what is the last IP address that can be assigned to a host?A. 131.1.123.30B. 131.1.123.31C. 131.1.123.32D. 131.1.123.33QUESTION 222The ip subnet zero command is not configured on a router. What would be the IP address of Ethernet0/0using the first available address from the sixth subnet of the network 192.168.8.0/29?A. 192.168.8.25B. 192.168.8.41C. 192.168.8.49D. 192.168.8.113QUESTION 223For the network 192.0.2.0/23, which option is a valid IP address that can be assigned to a host?A. 192.0.2.0B. 192.0.2.255C. 192.0.3.255D. 192.0.4.0QUESTION 224How many addresses for hosts will the network 124.12.4.0/22 provide?A. 510B. 1022C. 1024D. 2048QUESTION 225Where does routing occur within the DoD TCP/IP reference model?A. applicationB. internetC. networkD. transportWhich VTP mode is capable of creating only local VLANs and does not synchronize with other switches inthe VTP domain?A. clientB. dynamicC. serverD. staticE. transparentQUESTION 227Which switch would STP choose to become the root bridge in the selection process?A. 32768: 11-22-33-44-55-66B. 32768: 22-33-44-55-66-77C. 32769: 11-22-33-44-55-65D. 32769: 22-33-44-55-66-78QUESTION 228A switch is configured with all ports assigned to vlan 2 with full duplex FastEthernet to segment existingdepartmental traffic. What is the effect of adding switch ports to a new VLAN on the switch?A. More collision domains will be created.B. IP address utilization will be more efficient.C. More bandwidth will be required than was needed previously.D. An additional broadcast domain will be created.QUESTION 229Which two statements about the use of VLANs to segment a network are true? (Choose two.)A. VLANs increase the size of collision domains.B. VLANs allow logical grouping of users by function.C. VLANs simplify switch administration.D. VLANs enhance network security.QUESTION 230On corporate network, hosts on the same VLAN can communicate with each other, but they are unable tocommunicate with hosts on different VLANs. What is needed to allow communication between the VLANs?A. a router with subinterfaces configured on the physical interface that is connected to the switchB. a router with an IP address on the physical interface connected to the switchC. a switch with an access link that is configured between the switchesD. a switch with a trunk link that is configured between the switchesQUESTION 231When a DHCP server is configured, which two IP addresses should never be assignable to hosts? (Choosetwo.)A. network or subnetwork IP addressB. broadcast address on the networkC. IP address leased to the LAND. IP address used by the interfacesE. manually assigned address to the clientsF. designated IP address to the DHCP serverQUESTION 232Which statement describes the process of dynamically assigning IP addresses by the DHCP server?A. Addresses are allocated after a negotiation between the server and the host to determine the length ofthe agreement.B. Addresses are permanently assigned so that the hosts uses the same address at all times.C. Addresses are assigned for a fixed period of time, at the end of the period, a new request for anaddress must be made.D. Addresses are leased to hosts, which periodically contact the DHCP server to renew the lease.QUESTION 233Which network protocol does DNS use?A. FTPB. TFTPC. TCPD. UDPE. SCPAnswer: DExplanation/Reference:此题答案并不严格,严格讲DNS有两个端口号一个为TCP一个为UDP并且端口号都为53 DNS解析用UDP 效率高但不能保证完整性DNS服务器之间同步使用TCP保证数据正确QUESTION 234When two hosts are trying to communicate across a network, how does the host originating the communication determine the hardware address of the host that it wants to "talk" to?A. RARP requestB. Show Network Address requestC. Proxy ARP requestD. ARP requestE. Show Hardware Address requestQUESTION 235Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the followingare true? (Choose two.)CCNA考试报名1700元107艾迪飞论坛艾迪飞论坛A. Router C will use ICMP to inform Host 1 that Host 2 cannot be reached.B. Router C will use ICMP to inform Router B that Host 2 cannot be reached.C. Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached.D. Router C will send a Destination Unreachable message type.E. Router C will send a Router Selection message type.F. Router C will send a Source Quench message typeQUESTION 236To configure the VLAN trunking protocol to communicate VLAN information between two switches, whattwo requirements must be met? (Choose two.)A. Each end of the trunk line must be set to IEEE 802.1E encapsulation.B. The VTP management domain name of both switches must be set the same.C. All ports on both the switches must be set as access ports.D. One of the two switches must be configured as a VTP server.E. A rollover cable is required to connect the two switches together.F. A router must be used to forward VTP traffic between VLANs.QUESTION 237Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two.)A. It is locally significant.B. It is globally significant.C. It is needed to identify a unique instance of an OSPF database.D. It is an optional parameter required only if multiple OSPF processes are running on the router.E. All routers in the same OSPF area must have the same process ID if they are to exchange routinginformation.QUESTION 238What functions do routers perform in a network? (Choose two.)A. packet switchingB. access layer securityC. path selectionD. VLAN membership assignmentE. bridging between LAN segmentsF. microsegmentation of broadcast domainsQUESTION 239Which series of commands will configure router R1 for LAN-to-LAN communication with router R2? Theenterprise network address is 192.1.1.0/24 and the routing protocol in use is RIP. (Choose three.)A. R1(config)# interface ethernet 0R1(config-if)# ip address 192.1.1.129 255.255.255.192R1(config-if)# no shutdownB. R1(config)# interface ethernet 0R1(config-if)# ip address 192.1.1.97 255.255.255.192R1(config-if)# no shutdownC. R1(config)# interface serial 0R1(config-if)# ip address 192.1.1.4 255.255.255.252R1(config-if)# clock rate 56000D. R1(config)# interface serial 0R1(config-if)# ip address 192.1.1.6 255.255.255.252R1(config-if)# no shutdownCCNA考试报名1700元109艾迪飞论坛艾迪飞论坛E. R1(config)# router ripR1(config-router)# network 192.1.1.4R1(config-router)# network 192.1.1.128F. R1(config)# router ripR1(config-router)# version 2R1(config-router)# network 192.1.1.0QUESTION 240A network administrator wants to ensure that only the server can connect to port Fa0/1 on a Catalystswitch. The server is plugged into the switch Fa0/1 port and the network administrator is about to bring theserver online. What can the administrator do to ensure that only the MAC address of the server is allowedby switch port Fa0/1? (Choose two.)A. Configure port Fa0/1 to accept connections only from the static IP address of the server.B. Employ a proprietary connector type on Fa0/1 that is incompatible with other host connectors.C. Configure the MAC address of the server as a static entry associated with port Fa0/1.D. Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofingthe server IP address.E. Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of theserver.F. Configure an access list on the switch to deny server traffic from entering any port other than Fa0/1.QUESTION 241The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic.There is concern that a lack of router resources is impeding internetwork performance. As part of examining the router resources, the OSPF DRs need to be known. All the router OSPF priorities are at thedefault and the router IDs are shown with each router. Which routers are likely to have been elected asDR? (Choose two.)A. Corp-1B. Corp-2C. Corp-3D. Corp-4E. Branch-1F. Branch-2QUESTION 242At which layers of the OSI model do WANs operate? (Choose two.)A. application layerB. session layerC. transport layerD. network layerE. datalink layerF. physical layerQUESTION 243Which routing protocols can be used within the enterprise network shown in the diagram? (Choose three.)A. RIP v1B. RIP v2C. IGRPD. OSPFE. BGPF. EIGRPQUESTION 244Refer to the graphic. R1 is unable to establish an OSPF neighbor relationship with R3. What are possiblereasons for this problem? (Choose two.)A. All of the routers need to be configured for backbone Area 1.B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from beingestablished.D. The hello and dead interval timers are not set to the same values on R1 and R3.E. EIGRP is also configured on these routers with a lower administrative distance.F. R1 and R3 are configured in different areas.QUESTION 245Which statements are true about EIGRP successor routes? (Choose two.)A. A successor route is used by EIGRP to forward traffic to a destination.B. Successor routes are saved in the topology table to be used if the primary route fails.C. Successor routes are flagged as "active" in the routing table.D. A successor route may be backed up by a feasible successor route.E. Successor routes are stored in the neighbor table following the discovery process.QUESTION 246CCNA考试报名1700元112艾迪飞论坛Refer to the diagram. All hosts have connectivity with one another. Which statements describe theaddressing scheme that is in use in the network? (Choose three.)A. The subnet mask in use is 255.255.255.192.B. The subnet mask in use is 255.255.255.128.C. The IP address 172.16.1.25 can be assigned to hosts in VLAN1D. The IP address 172.16.1.205 can be assigned to hosts in VLAN1E. The LAN interface of the router is configured with one IP address.F. The LAN interface of the router is configured with multiple IP addresses.QUESTION 247Refer to the diagram. Which three statements describe the router port configuration and the switch portconfiguration as shown in the topology? (Choose three.)A. The Router1 WAN port is configured as a trunking port.B. The Router1 port connected to Switch1 is configured using subinterfaces.C. The Router1 port connected to Switch1 is configured as 10 Mbps.D. The Switch1 port connected to Router1 is configured as a trunking port.E. The Switch1 port connected to Host B is configured as an access port.F. The Switch1 port connected to Hub1 is configured as full duplex.QUESTION 248Which routing protocols will support the following IP addressing scheme? (Choose three.) Network 1 - 192.168.10.0 /26Network 2 - 192.168.10.64 /27Network 3 - 192.168.10.96 /27Network 4 - 192.168.10.128 /30Network 5 - 192.168.10.132 /30A. RIP version 1B. RIP version 2C. IGRPD. EIGRPE. OSPFQUESTION 249Refer to the partial command output shown. Which two statements are correct regarding the routerhardware? (Choose two.)A. Total RAM size is 32 KB.B. Total RAM size is 16384 KB (16 MB).C. Total RAM size is 65536 KB (64 MB).D. Flash size is 32 KB.E. Flash size is 16384 KB (16 MB).F. Flash size is 65536 KB (64 MB)QUESTION 250The Ethernet networks connected to router R1 in the graphic have been summarized for router R2 as192.1.144.0/20. Which of the following packet destination addresses will R2 forward to R1, according to thissummary? (Choose two.)A. 192.1.159.2B. 192.1.160.11C. 192.1.138.41D. 192.1.151.254E. 192.1.143.145F. 192.1.1.144QUESTION 251The show interfaces serial 0/0 command resulted in the output shown in the graphic. What are possiblecauses for this interface status? (Choose three.)A. The interface is shut down.B. No keepalive messages are received.C. The clockrate is not set.D. No loopback address is set.E. No cable is attached to the interface.F. There is a mismatch in the encapsulation type.QUESTION 252Which of the following describe private IP addresses? (Choose two.)A. addresses chosen by a company to communicate with the InternetB. addresses that cannot be routed through the public InternetC. addresses that can be routed through the public InternetD. a scheme to conserve public addressesE. addresses licensed to enterprises or ISPs by an Internet registry organizationQUESTION 253Refer to the exhibit. The network shown in the diagram is experiencing connectivity problems. Which of thefollowing will correct the problems? (Choose two.)A. Configure the gateway on Host A as 10.1.1.1.B. Configure the gateway on Host B as 10.1.2.254.C. Configure the IP address of Host A as 10.1.2.2.D. Configure the IP address of Host B as 10.1.2.2.E. Configure the masks on both hosts to be 255.255.255.224.F. Configure the masks on both hosts to be 255.255.255.240.QUESTION 254A network associate is trying to understand the operation of the FLD Corporation by studying the network inthe exhibit. The associate knows that the server in VLAN 4 provides the necessary resources to support theuser hosts in the other VLANs. The associate needs to determine which interfaces are access ports. WhichCCNA考试报名1700元116艾迪飞论坛interfaces are access ports? (Choose three.)A. Switch1 - Fa 0/2B. Switch1 - Fa 0/9C. Switch2 - Fa 0/3D. Switch2 - Fa 0/4E. Switch2 - Fa 0/8F. Router - Fa 1/0QUESTION 255Refer to the exhibit. Which destination addresses will Host A use to send data to Host B? (Choose two.)A. the IP address of Switch1B. the IP address of Router1 Fa0/0C. the IP address of HostBD. the MAC address of Switch1E. the MAC address of Router1 Fa0/0CCNA考试报名1700元117艾迪飞论坛F. the MAC address of HostBQUESTION 256The network security policy requires that only one host be permitted to attach dynamically to each switchinterface. If that policy is violated, the interface should shut down. Which two commands must the networkadministrator configure on the 2950 Catalyst switch to meet this policy? (Choose two.)A. Switch1(config-if)# switchport port-security maximum 1B. Switch1(config)# mac-address-table secureC. Switch1(config)# access-list 10 permit ip hostD. Switch1(config-if)# switchport port-security violation shutdownE. Switch1(config-if)# ip access-group 10QUESTION 257Refer to the graphic. A static route to the 10.5.6.0/24 network is to be configured on the HFD router. Whichcommands will accomplish this? (Choose two.)A. HFD(config)# ip route 10.5.6.0 0.0.0.255 fa0/0B. HFD(config)# ip route 10.5.6.0 0.0.0.255 10.5.4.6C. HFD(config)# ip route 10.5.6.0 255.255.255.0 fa0/0D. HFD(config)# ip route 10.5.6.0 255.255.255.0 10.5.4.6E. HFD(config)# ip route 10.5.4.6 0.0.0.255 10.5.6.0F. HFD(config)# ip route 10.5.4.6 255.255.255.0 10.5.6.0QUESTION 258What should be done prior to backing up an IOS image to a TFTP server? (Choose three.)A. Make sure that the server can be reached across the network.CCNA考试报名1700元118艾迪飞论坛B. Check that authentication for TFTP access to the server is set.C. Assure that the network server has adequate space for the IOS image.D. Verify file naming and path requirements.E. Make sure that the server can store binary files.F. Adjust the TCP window size to speed up the transfer.QUESTION 259What are the possible trunking modes for a switch port? (Choose three.)A. transparentB. autoC. onD. desirableE. clientF. forwardingQUESTION 260The network 172.25.0.0 has been divided into eight equal subnets. Which of the following IP addresses canbe assigned to hosts in the third subnet if the ip subnet-zero command is configured on the router? (Choosethree.)A. 172.25.78.243B. 172.25.98.16C. 172.25.72.0D. 172.25.94.255E. 172.25.96.17F. 172.25.100.16QUESTION 261Refer to the graphic. Host 1 cannot receive packets from Host 2. Assuming that RIP v1 is the routingprotocol in use, what is wrong with the IP configuration information shown? (Choose two.)A. The fa0/1 interface of router R2 has been assigned a broadcast address.B. The fa0/1 network on router R2 overlaps with the LAN attached to R1.C. Host 2 has been assigned the incorrect subnet mask.D. Host 1 has been configured with the 255.255.248.0 subnet mask.E. Host 2 on router R2 is on a different subnet than its gateway.QUESTION 262What are three valid reasons to assign ports to VLANs on a switch? (Choose three.)A. to make VTP easier to implementB. to isolate broadcast trafficC. to increase the size of the collision domainD. to allow more devices to connect to the networkE. to logically group hosts according to functionF. to increase network securityQUESTION 263Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links areoperating at the same bandwidth? (Choose three.)A. Switch A - Fa0/0B. Switch A - Fa0/1C. Switch B - Fa0/0D. Switch B - Fa0/1E. Switch C - Fa0/0F. Switch C - Fa0/1QUESTION 264Which statements describe two of the benefits of VLAN Trunking Protocol? (Choose two.)A. VTP allows routing between VLANs.B. VTP allows a single switch port to carry information to more than one VLAN.C. VTP allows physically redundant links while preventing switching loops.D. VTP simplifies switch administration by allowing switches to automatically share VLAN configurationinformation.E. VTP helps to limit configuration errors by keeping VLAN naming consistent across the VTP domain.F. VTP enhances security by preventing unauthorized hosts from connecting to the VTP domain.QUESTION 265What are two results of entering the Switch(config)# vtp mode client command on a Catalyst switch?CCNA考试报名1700元121艾迪飞论坛艾迪飞论坛(Choose two.)A. The switch will ignore VTP summary advertisements.B. The switch will forward VTP summary advertisements.C. The switch will process VTP summary advertisements.D. The switch will originate VTP summary advertisements.E. The switch will create, modify and delete VLANs for the entire VTP domain.QUESTION 266A network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a hostthat has been newly connected to the network. Which protocols were used during the test? (Choose two.)A. ARPB. CDPC. DHCPD. DNSE. ICMPQUESTION 267Refer to the exhibit. Host A is to send data to Host B. How will Router1 handle the data frame receivedfrom Host A? (Choose three.)A. Router1 will strip off the source MAC address and replace it with the MAC address on the forwardingFastEthernet interface.B. Router1 will strip off the source IP address and replace it with the IP address on the forwarding FastEthernet interface.C. Router1 will strip off the destination MAC address and replace it with the MAC address of Host B.D. Router1 will strip off the destination IP address and replace it with the IP address of Host B.E. Router1 will forward the data frame out interface FastEthernet0/1.F. Router1 will forward the data frame out interface FastEthernet0/2.QUESTION 268Refer to the exhibit. What will Router1 do when it receives the data frame shown? (Choose three.)A. Router1 will strip off the source MAC address and replace it with the MAC address 0000.0c36.6965.B. Router1 will strip off the source IP address and replace it with the IP address 192.168.40.1.C. Router1 will strip off the destination MAC address and replace it with the MAC address 0000.0c07.4320.D. Router1 will strip off the destination IP address and replace it with the IP address of 192.168.40.1.E. Router1 will forward the data packet out interface FastEthernet0/1.F. Router1 will forward the data packet out interface FastEthernet0/2.QUESTION 269Refer to the exhibit. Host A pings Host B. What source MAC address and source IP address are containedin the frame as the frame leaves R2 destined for host B?A. abcd.abcd.a001B. abcd.abcd.b002C. abcd.abcd.c003D. 10.2.0.15E. 10.0.64.1F. 10.0.128.15QUESTION 270Refer to the exhibit. A network associate has configured OSPF with the command:City(config-router)# network 192.168.12.64 0.0.0.63 area 0After completing the configuration, the associate discovers that not all the interfaces are participating inOSPF. Which three of the interfaces shown in the exhibit will participate in OSPF according to this configuration statement? (Choose three.)A. FastEthernet0 /0CCNA考试报名1700元124艾迪飞论坛B. FastEthernet0 /1C. Serial0/0D. Serial0/1.102E. Serial0/1.103F. Serial0/1.104QUESTION 271A Catalyst 2950 needs to be reconfigured. What steps will ensure that the old configuration is erased?(Choose three.)A. Erase flash.B. Restart the switch.C. Delete the VLAN database.D. Erase the running configuration.E. Erase the startup configuration.F. Modify the configuration register.QUESTION 272Refer to the exhibit. The FMJ manufacturing company is concerned about unauthorized access to thePayroll Server. The Accounting1, CEO, Mgr1, and Mgr2 workstations should be the only computers withaccess to the Payroll Server. What two technologies should be implemented to help prevent unauthorizedaccess to the server? (Choose two.)A. access listsB. encrypted router passwordsC. STPD. VLANsCCNA考试报名1700元125艾迪飞论坛E. VTP。
ccna1_11测试真题
1Refer to the exhibit. A student is responsible for the IP addressing, configuration and connectivity testing of the network sho graphic. A ping from host B to host C results in a destination unreachable but a ping from host B to host A was successful.reasons could account for this failure based on the graphic and partial router output for the Dallas router? (Choose two.)The host A is turned off.The Fa0/0 interface on Dallas is shutdown.The LAN cable is disconnected from host B.The S0/0/1 IP address of Dallas is improperly configured.The Fa0/0 interface on Dallas is in a different subnet than host B.The clock rate is missing on the serial link between Dallas and NYC.2Refer to the exhibit. Which names correctly identify the CLI mode represented by the prompt for Switch-East4#? (Choose tline configuration modeuser executive modeglobal configuration modeprivileged executive modeinterface configuration modeenable mode3The serial connection shown in the graphic needs to be configured. Which configuration commands must be made on the S to establish connectivity with the Melbourne site? (Choose three.)Sydney(config-if)# ip address 201.100.53.2 255.255.255.0Sydney(config-if)# no shutdownSydney(config-if)# ip address 201.100.53.1 255.255.255.224Sydney(config-if)# clock rate 56000Sydney(config-if)# ip host Melbourne 201.100.53.24W hen network services fail, which port is most often used to access a router for management purposes?AUXEthernetConsoleTelnetSSH5In a Cisco device, where is the IOS file stored prior to system startup?RAMROMFlashNVRAM6Refer to the exhibit. A network administrator on HostA has problems accessing the FTP server. Layer three connectivity te successful from HostA to the S1 interface of RouterB. Which set of commands will allow the network administrator to telnet and run debug commands?RouterB(config)# enable secret classRouterB(config)# line vty 0 4RouterB(config-if)# loginRouterB(config)# enable secret classRouterB(config)# line vty 0 2RouterB(config-vty)# password ciscoRouterB(config-vty)# loginRouterB(config)# enable secret classRouterB(config)# line vty 0RouterB(config-line)# password ciscoRouterB(config-line)# loginRouterB(config)# enable secret classRouterB(config)# line aux 0RouterB(config-line)# password ciscoRouterB(config-line)# loginRouterB(config)# enable secret classRouterB(config)# line aux 0RouterB(config-vty)# password ciscoRouterB(config-vty)# login7What command is used to change the default router name to Fontana?Router# name FontanaRouter# hostname FontanaRouter(config)# name FontanaRouter(config)# hostname Fontana8A network administrator needs to keep the user ID, password, and session contents private when establishing remote CLI with a router to manage it. Which access method should be chosen?TelnetConsoleAUXSSH9On a Cisco router, which interface would be used to make the initial configuration?10Refer to the exhibit. The output is shown for the show ip route command executed on Router A. What does the IP addres represent?Gateway for the 192.168.1.0 networkGateway for the 192.168.3.0 networkIP assigned to the serial port on Router AIP assigned to the serial port on Router B11Refer to the exhibit. A technician applies the configuration in the exhibit to a clean router. To verify the configuration, the t issues the show running-config command in the CLI session with the router. What lines should the technician expect to router output from the show running-config command?enable password classline console 0password ccnaenable secret ciscoenable password classline console 0password ccnaenable secret 5 $1$v0/3$QyQWmJyT7zCa/yaBRasJm0enable password classline console 0password ccnaenable secret ciscoenable password 7 14141E0A1F17line console 0password 7 020507550Aenable secret 5 $1$v0/3$QyQWmJyT7zCa/yaBRasJm0enable password 7 14141E0A1F17line console 0password 7 020507550A12The connection between routers B and C has been successfully tested. However, after rebooting router C, the administra response time between networks 10.10.3.0 and 10.10.4.0 is slower. Ping between the two routers is successful. A trace r three hops from router B to router C. What else can be done to troubleshoot the problem?Ping router B S0/1 connection from router C.Trace the connection between router B to router C S0/1.Issue a show ip route command in router B to verify routing is enabled.Issue a show ip interface brief command on router C.13In a Cisco router, when do changes made to the running-configuration take effect?after a system restartas the commands are enteredwhen logging off the systemwhen the configuration is saved to the startup-configuration14W hich three terms correctly define the forms of help available within the Cisco IOS? (Choose three.)hot keyscontext-checkcontext-sensitivestructured checkcommand overridecommand syntax check15Refer to the exhibit. What command will place the router into the correct mode to configure an appropriate interface to con LAN?UBAMA# configure terminalUBAMA(config)# line vty 0 4UBAMA(config)# line console 0UBAMA(config)# interface Serial 0/0/0UBAMA(config)# interface FastEthernet 0/116Which combination of keys would be used at the CLI prompt to interrupt a ping or traceroute process?Ctrl-CCtrl-PCtrl-RCtrl-Shift-6Ctrl-Z17U sers in the network are experiencing slow response time when doing file transfers to a remote server. What command co to determine if the router has experienced any input or output errors?show running-configshow startup-configshow interfacesshow ip routeshow versionshow memory18Immediately after a router completes its boot sequence, the network administrator wants to check the routers configuratio privileged EXEC mode, which of the following commands can the administrator use for this purpose? (Choose two.)show flashshow NVRAMshow startup-configshow running-configshow version19Refer to the exhibit. What additional command is required to allow remote access to this switch?NA-SW1(config-if)# no shutdownNA-SW1(config)# enable password passwordNA-SW1(config)# ip default-gateway addressNA-SW1(config-if)# description description。
思科第一学期期末考试考题CCNA
1Refer to the exhibit. Which Layer 2 protocol could be used inside nework A and network C?IPTCPUDPEthernet2Refer to the exhibit. Which set of devices contains only intermediary devices?A, B, D, GA, B, E, FC, D, G, IG, H, I, J3Refer to the exhibit. The headers added at each layer are shown. Which layer adds the destination and source process num ensure that data is delivered to the correct application?physical layerdata link layernetwork layertransport layer4The Layer 4 header contains which type of information to aid in the delivery of data?service port numberhost logical addressdevice physical addressvirtual connection identifier5Which fiber connector supports full-duplex Ethernet?6Which device should be used for routing a packet to a remote network?access switchDHCP serverhubrouter7Refer to the exhibit. Host A sends a frame to host C with a destination MAC address CC. The MAC address for host C is no table of switch SW1. How will SW1 handle the frame?Switch SW1 will drop the frame.Switch SW1 will forward the frame to host C.Switch SW1 will flood the frame out all ports.Switch SW1 will flood the frame out all ports except port Fa0/1.8Refer to the exhibit. A network technician has made several changes to R1 since the configuration has last been saved. Th configuration did not produce the desired changes. The technician wants to store a backup copy of the saved configurationserver before reloading. Which action will cause the unmodified data to be saved on the TFTP server?9Which three statements are true about network layer addressing? (Choose three.)It uniquely identifies each host.It assists in forwarding packets across internetworks.It uses a logical 32-bit IPv4 address.It is not a configurable address.It is a physical address.It identifies the host from the first part of the address.10What is the result of using the clock rate 56000 command at the serial interface of the router?The interface is configured as a DCE device.The interface timers are cleared.The FastEthernet interface is made to emulate a serial interface by assigning it a timing signal.The IP address for the serial interface is configured.11Examine the graphic with current configurations. Host A in the Clerical office failed and was replaced. Although a ping to 12 successful, the replacement computer cannot access the company network. With proxy ARP disabled on the Fa0/0 interfac York router, what is the likely cause of the problem?network card failurenetwork cables unpluggedIP address incorrectly enteredsubnet mask incorrectly entered12As network administrator, what is the subnet mask that allows 510 hosts given the IP address 172.30.0.0?255.255.0.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0255.255.255.12813Which OSI layer uses a connection-oriented protocol to ensure reliable delivery of data?application layerpresentation layersession layertransport layer14 A network has grown too large for technicians to configure network addresses and hosts files for name resolution. Which twlayer services should be added to the server to allow these needs to be satisfied dynamically? (Choose two.)DNSFTPDHCPHTTPSMTP15Refer to the exhibit. Host A wants to access the Internet. Which combination of a Layer 2 address and a Layer 3 address w access from host A?Destination MAC: 0030.8596.DE83 Default gateway: 209.165.202.130Destination MAC: 0030.8596.DE82 Default gateway: 172.16.9.2Destination MAC: 0030.8517.44C4 Default gateway: 172.16.1.1Destination MAC: 0030.8517.44C4 Default gateway: 209.165.202.13016 A network administrator is asked to design a new addressing scheme for a corporate network. There are 60 users in the musers in the branch office, 28 users in manufacturing, 12 in the sales office, and 4 users in the research office. Which VLSM scheme that uses the 192.168.88.0/24 network will fulfill the requirements while wasting the fewest addresses?192.168.88.0/26 main192.168.88.64/26 manufacturing192.168.88.96/27 sales192.168.88.128/28 research192.168.88.0/26 main192.168.88.128/27 manufacturing192.168.88.160/28 sales192.168.88.176/29 research192.168.88.0/27 main192.168.88.64/28 manufacturing192.168.88.80/29 sales192.168.88.88/30 research192.168.88.0/27 main192.168.88.80/28 manufacturing192.168.88.96/29 sales192.168.88.104/30 research17Which physical connector type is used for a serial V.35 connection to the CSU/DSU?18Refer to the exhibit. Which two facts can be determined about the topology? (Choose two.)Four collision domains are present.One logical network is represented.Two broadcast domains are present.Three networks are needed.Three logical address ranges are required.19What are three characteristics of CSMA/CD? (Choose three.)It monitors the media for presence of a data signal.After detecting a collision, hosts can resume transmission after a random timer has expired.A jam signal is used to ensure that all hosts are aware that a collision has occurred.Devices can be configured with a higher transmission priority.Data is transmitted only when the data signal is present.It uses a token system to avoid collisions.20Refer to the exhibit. The serial interface of the router was configured with the use of the commands that are shown. The rou ping the router that is directly connected to interface serial 0/0/0. What should the network technician do to solve this probleConfigure the description at interface serial 0/0/0.Configure an IP address on interface serial 0/0/0.Remove the no shutdown command at interface serial 0/0/0Reboot the router.21Which OSI layer uses the header information to reassemble the data segments into streams?application layernetwork layerpresentation layersession layertransport layer22Refer to the exhibit. The NAT functionality of the router is enabled to provide Internet access to the PC. However, the PC is access the Internet. Which IP address should be changed to 209.165.201.1 to enable the PC to access the Internet?192.168.1.191192.168.1.101192.168.1.1192.168.1.25423Refer to the exhibit. A technician uses the nslookup command on the PC and views the output that is displayed in the exhib IP address of the primary domain name server used by the host?10.10.10.32192.168.1.5192.168.1.99192.168.2.10024Which memory contents will change as a result of using the Router# erase startup-config command on a router?RAMROMflashNVRAM25While configuring a router, a network technician wants to name the router. Which prompt should the technician see when e hostname command?Router>Router#Router(config)#Router(config-line)#26Refer to the exhibit. The PC, the routing table of which is displayed, is configured correctly. To which network device or inte IP address 192.168.1.254 belong?PCswitchrouter interface fa0/0router interface fa0/127Refer to the exhibit. A network administrator is troubleshooting a link that is down between Router1 and Router2. To correc which wire pairs need to be switched on one of the Ethernet cable ends?pair 1 and pair 2pair 1 and pair 3pair 2 and pair 3pair 2 and pair 428Refer to the exhibit. A PC is connected to a network. Which action will verify that the PC can communicate with its default gUse the ping 127.0.0.1 command.Use the ipconfig command.Use the ipconfig/all command.Use the ping 10.0.0.254 command.29Refer to the exhibit. Host B was powered off. What change will occur in the MAC table of the switch?The table will remain unaffected.The switch will remove the MAC address at Fa0/19.The switch will retain the MAC address until host B is powered on again.The switch will rebuild the MAC table by assigning the FFFF.FFFF.FFFF address to port Fa0/19.30What information is contained in the header of Layer 3 to help data delivery?port numberdevice physical addressdestination host logical addressvirtual connection identifier31 A network technician is tasked with setting up a network for six users, but the users should be able to use their accounts toany of the six computers. What type of network should be used?workgroupP2P applicationspeer-to-peer networkclient-server network32Refer to the exhibit. A web browser is running on host PC1 with an IP address 10.10.2.2/24. A dynamic port number of 4915 to the browser. The browser sends a request for a web page to the web server with an IP address 192.168.1.254/24. Which true?The session is established using TCP, and the socket number for the web server is 192.168.1.254: 80.The session is established using TCP, and the socket number for the web server is 192.168.1.254: 49152.The session is established using UDP, and the socket number for the web server is 192.168.1.254: 80.The session is established using UDP, and the socket number for the web server is 192.168.1.254: 49152.33Refer to the exhibit. An administrator on PC1 wants to view some HTML code from a web page housed on the web server. application will allow this request to be started?34Refer to the exhibit. What is required on host A for a network technician to create the initial configuration on Router1?an FTP clienta Telnet clienta terminal emulation programa web browser35What are two characteristics of the data link layer? (Choose two.)It segments and reorders the data.It exchanges the frames between nodes.It defines the method by which network devices place data onto the media.It manages the transfer of data between the processes that run on each host.It retrieves signals from the media and restores them to their bit representations.36 A network administrator wants to restrict access to the router privileged EXEC mode. Which password should the administrenableauxconsoleVTY37Which three IPv4 addresses represent a broadcast for a subnet? (Choose three.)172.16.4.63 /26172.16.4.129 /26172.16.4.191 /26172.16.4.51 /27172.16.4.95 /27172.16.4.221 /2738Refer to the exhibit. Host X is unable to communicate with host Y. Which command can be run at host X to determine whic device is responsible for this failure?telnet 192.168.1.1ping 192.168.1.1ftp 192.168.1.1tracert 192.168.1.139Refer to the exhibit. Which option shows the correct topology given the configuration of Router1?40If an administrator wished to return a router to the default state, what additional step must be taken after issuing the comma start-up config?Reload the device.Issue the command copy running-config start-up config.Perform a show running-config to verify that the file was removed.Enter the interface commands to allow the device to connect to the network.41By using the ipconfig command, a network administrator determines that a workstation has the address 192.168.3.38 with the subnet mask. To what network does the workstation belong?192.168.3.8192.168.3.16192.168.3.24192.168.3.3242Which statement is true about router hostnames?A hostname should be unique on each router.A router hostname cannot contain capital letters.A router hostname is configured in privileged executive mode.A router hostname must be created before any other configurations can be added to the device.43 A user types the enable command. What task can be performed at the privileged EXEC mode?Configure the device.Configure individual interfaces.Configure individual terminal lines.Issue show and debug commands.44Refer to the exhibit. Which logical topology describes the exhibited network?starringpoint-to-pointmulti-access45Refer to the exhibit. A user wants to access the Internet from the PC. A part of the running configuration of the router is sho default gateway IP address should be configured at the PC to enable this access?10.1.192.110.1.192.210.1.192.54192.31.7.146Which statement is true about the ICMP protocol?It is an application layer protocol.It is designed to make IP a reliable protocol.It is often filtered out of networks for security purposes.If a host does not respond to an ICMP echo request, the host is not functioning.47Refer to the exhibit. At which OSI layer is serial interface 0/0/1 experiencing problems?Layer 1Layer 2Layer 3Layer 448Refer to the exhibit. The host was disconnected from switch 2 and connected to switch 1. Which combination of IP address, and default gateway should be assigned to this host to allow it to function in the network?IP address: 10.10.9.37 Subnet mask: 255.255.255.240 Default gateway: 10.10.9.35IP address: 10.10.9.37 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.35IP address: 10.10.9.29 Subnet mask: 255.255.255.248 Default gateway: 10.10.9.35IP address: 10.10.9.32 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.35IP address: 10.10.9.37 Subnet mask: 255.255.255.224 Default gateway: 196.1.105.6IP address: 10.10.9.63 Subnet mask: 255.255.255.224 Default gateway: 10.10.9.3549Refer to the exhibit. The diagram represents the process of sending email between clients. Select the list below that correc the component or protocol used at each numbered stage of the diagram.1.MUA2.MDA3.MTA4.SMTP5.MTA6.POP7.MDA8.MUA1.MUA2.POP3.MDA4.SMTP5.MTA6.MDA7.SMTP8.MUA1.MUA2.POP3.SMTP4.MDA5.MTA6.SMTP7.POP8.MUA1.MDA2.SMTP3.MTA4.SMTP5.MTA6.MUA7.POP8.MDA1.MUA2.SMTP3.MTA4.SMTP5.MTA6.MDA7.POP8.MUA50What is the Cisco IOS?system software for Cisco devicesRead Only Memory in Cisco devicesnon-volatile storage for device configurationsan initial operating system that is used for boot functions。
ccna1章节与期末答案
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。
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CCNA1 ENetwork Final Exam - CCNA Exploration: 网络基础知识(版本4.0)这是我自己做的，其中一道题错误，不知道是哪个，被扣了2分。
日期：2011-10-10 1下列有关网络层编址的陈述中哪三项是正确的?（选择三项。
）网络层编址使用分层式结构。
使用长度为48 位的地址。
以太网交换机可以使用它来作出转发决定。
它不支持广播。
其使用的编址方法可以识别地址的网络部分。
网络层编址可以区分每台主机。
2请参见图示。
在PC 上发出所示的命令。
IP 地址192.168.33.2 代表什么？主机的IP 地址主机的默认网关主机的主页IP 地址主机的首选域名服务器网站resolver1.mooki.local 的IP 地址。
3哪三个地址属于公有IP 地址？（选择三项。
）127.0.0.1196.1.105.6132.11.9.9910.0.0.1172.16.9.1046.1.1.974数据链路层有哪两项功能？（选择两项）分割和记录数据。
在源主机和目的主机上运行的程序之间进行数据交换。
控制数据如何传递到介质中。
生成信号以表示每个帧中的比特。
使用帧头和帧尾封装每个数据包，以便在本地介质中进行传输。
5请参见图示。
主机A 要访问Internet。
哪项第2 层地址和第3 层地址的组合可以让主机A 实现此访问？目的MAC：0030.8596.DE83，默认网关：209.165.202.130目的MAC：0030.8596.DE82，默认网关：172.16.9.2目的MAC：0030.8517.44C4，默认网关：172.16.1.1目的MAC：0030.8517.44C4，默认网关：209.165.202.1306下列哪三项是CSMA/CD 的特征？（选择三项。
）设备会侦听介质，并且仅当无法检测到介质上存在其它信号时才会传输数据。
介质上的所有设备均可侦听所有通信。
设备根据配置的优先级来进行通信。
发生冲突后，引起冲突的设备会优先尝试传输数据。
发生冲突时，所有设备会在一段时间内停止传输数据，该段时间的长度随机决定。
CSMA/CD 使用令牌系统来避免冲突。
7下列哪三个IPv4 地址代表子网的有效网络地址？（选择三项。
）192.168.9.64/28192.168.9.146/28192.168.9.96/28192.168.9.129/26192.168.9.51/26192.168.9.64/268请参见图示。
用记号来表示每条介质链路。
用来连接不同设备的正确电缆类型是什么？连接1 - 直通电缆，连接2 - 直通电缆，连接3 - 交叉电缆连接1 - 直通电缆，连接2 - 交叉电缆，连接3 - 全反电缆连接1 - 交叉电缆，连接2 - 全反电缆，连接3 - 直通电缆连接1 - 交叉电缆，连接2 - 直通电缆，连接3 - 交叉电缆连接1 - 直通电缆，连接2 - 全反电缆，连接3 - 交叉电缆9请参见图示。
主机C 能够成功地ping 通127.0.0.1，但无法与组织中的主机A 和B 通信。
此问题的原因可能是什么？主机A 和B 与主机 C 不在同一个子网中。
路由器串行接口上的IP 地址有误。
主机C 配置的子网掩码不正确。
路由器1 的FastEthernet 接口配置有误。
10请参见图示。
根据显示的IP 配置回答，主机A 和主机B 无法在本地网络外通信的原因是什么？对主机A 分配了网络地址。
对主机B 分配了组播地址。
主机A 和主机B 属于不同的网络。
对网关地址分配了广播地址。
11请参见图示。
假设所有设备均使用默认配置。
支持显示的拓扑需要多少个子网？1345712请参见图示。
主机A 发送了一个以FFF.FFFF.FFFF 为目的MAC 地址的帧。
交换机将如何处理该帧？它会丢弃该帧。
它会将该帧送回到主机A。
它会将该帧发送到除主机A 之外的所有主机。
它会将该帧转发到默认网关。
13哪个OSI 层提供面向连接的可靠数据通信服务？应用层表示层会话层传输层网络层14当客户端应用程序发出到服务器的连接时，下列哪一个范围的端口号会动态地分配到客户端应用程序？0 到2550 到10231024 到49151大于6553515请参见图示。
路由器的路由表如图所示。
该路由器收到以192.168.9.4 为目的地址的数据包。
它将如何处理该数据包？它会丢弃数据包。
它会通过FastEthernet 0/1 转发该数据包。
它会将数据包转发到下一跳地址。
它会将数据包转发到172.16.2.0。
16请参见图示。
对图示拓扑可以得出哪两项结论？（选择两项）需要三个网络。
需要两个逻辑地址范围。
存在一个广播域。
存在三个冲突域。
需要四个网络。
17作为网络管理员，假设IP 地址为172.30.0.0，能够支持510 台主机的子网掩码是什么？255.255.0.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0255.255.255.12818下列有关在Cisco IOS 设备上运行配置文件的陈述，哪一项是正确的？修改配置文件会立即对设备的操作造成影响。
配置文件存储在NVRAM 中。
可使用erase running-config命令删除配置文件。
路由器重新启动时会自动保存配置文件。
19请参见图示。
PC 已连接到网络。
下列哪一项操作将验证PC 能够与其默认网关通信？使用ping 127.0.0.1命令。
使用ipconfig命令。
使用ipconfig/all命令。
使用ping 10.0.0.254命令。
20您所在的网际网络发生了路由问题。
要鉴别此错误，应该检查以下哪种设备？接入点主机集线器路由器交换机21请参见图示。
路由器已启用NAT 功能以供PC 访问Internet，但是PC 仍然无法访问Internet。
为了让PC 能够访问Internet，应将哪一项IP 地209.165.201.1？192.168.1.191192.168.1.101192.168.1.1192.168.1.25422请参见图示。
路由器的串行接口已使用图中所示的命令进行配置。
路由器无法ping 通直接连接到serial 0/0/0 接口的路由器。
网路技术人员应该如何配置Serial 0/0/0 接口的描述。
配置serial 0/0/0 接口的IP 地址。
在serial 0/0/0 接口上删除no shutdown命令重新启动路由器。
23请参见图示。
主机X 无法与主机Y 通信。
在主机X 上运行哪一项命令可识别导致此故障的中间设备？telnet 192.168.1.1ping 192.168.1.1ftp 192.168.1.1tracert 192.168.1.124网络技术人员想要使用ip address 192.168.1.1 255.255.255.0命令在路由器接口上配置IP 地址。
输入此命令后，技术人员会看到下列哪一项提示Router>Router(config-if)#Router#Router(config)#25请参见图示。
下列关于图中所示IP 配置的陈述，哪三项是正确的？（选择三项）分配给该计算机的地址代表私有地址。
该计算机无法在本地网络外通信。
此计算机的网络可支持126 台主机。
该计算机地址的前缀是/27。
分配给该计算机的IP 地址可在Internet 上路由。
分配给该计算机的IP 地址是广播地址。
26下列有关网络层编址的陈述中哪三项是正确的?（选择三项。
）唯一标识每台主机。
有助于通过网际网络转发数据包。
使用32 位逻辑IPv4 地址。
是不可配置的地址。
是物理地址。
通过地址的第一部分来标识主机。
27当OSI 模型下层执行无连接协议时，通常使用什么来确认数据已收到并请求重传丢失的数据？IPUDP以太网无连接确认面向连接的上层协议或服务28请参见图示。
从显示的会话信息中可以得出以下哪两个结论？（选择两项）所用的协议是一种面向连接的协议。
此交换是三次握手的一部分。
SYN 标志代表开始建立会话。
目的端口表示已经发起了FTP 会话。
源端口不支持与列出的目的端口通信。
29请参见图示。
主机A 要连接到位于不同网络中的主机B。
为了实现此连接，可以为主机A 分配哪三项IP 地址？（选择三项。
）172.16.11.36172.16.11.95172.16.11.88172.16.11.70172.16.11.64172.16.11.6730请参见图示。
某用户要从PC 访问Internet。
路由器的部分运行配置如图所示。
要实现此访问，应该为PC 配置下列哪一个默认网关IP 地址？10.1.192.110.1.192.210.1.192.54192.31.7.131请参见图示。
网络中的主机A 和B 正在传输层交换数据段。
下列关于此交换的陈述，哪两项是正确的？（选择两项）主机A 正在使用FTP 向主机B 传输文件。
主机A 将发送起始字节编号为11 的下一数据段。
目的主机的数据段表示已成功收到11 字节。
主机A 正在发起到主机B 的Telnet 会话。
主机B 可以发送开始字节编号为2 的下一数据段。
32在路由器的串行接口处使用clock rate 56000命令会产生什么结果？接口被配置为DCE 设备。
接口的计时器信息被清除。
通过为FastEthernet 接口分配计时信号，使其模拟串行接口。
串行接口的IP 地址得以配置。
33请参见图示。
主机A 要访问电子邮件。
要传达此请求，将使用哪一个目的套接字数字？10.10.1.2:530007.A7B8.0008:2510.10.1.3:2310.10.1.3:2534下列哪一个OSI 层负责管理数据段？应用层表示层会话层传输层35由于发生安全规规事件，必须更改路由器口令。
从以下配置项可获知什么信息？（选择两项。
）Router(config)#line vty 0 3Router(config-line)# password c13c0Router(config-line)#login这些配置项对远程访问指定了三条Telnet 线路。
这些配置项对远程访问指定了四条Telnet 线路。
这些配置项将控制台口令和Telnet 口令设置为"c13c0"。
因为Telnet 配置不完整，所以Telnet 访问将遭到拒绝。
允许使用"c13c0" 作为口令访问Telnet。
36一位技术人员必须通过要求提供口令来确保交换机特权执行模式的安全。
哪种类型的口令能满足此类登录的需要并可视为最安全的口令？控制台电缆使能使能加密口令VTY37请参见图示。
技术人员正在处理网络问题，需要验证路由器的LAN 接口。
要确认路由器接口工作正常，应该从此主机ping 哪个地址？127.0.0.1192.168.64.196192.168.254.1192.168.254.9192.168.254.25438哪种口令在创建时自动加密？vtyaux控制台电缆使能加密口令使能口令39请参见图示。