思科第一学期 总复习 中文题目 英文答案
思科CCNA1第八章试题及答案英文版
1. 1. QuestionWhat is a result of connecting two or more switches together?o The number of broadcast domains is increased.o The size of the broadcast domain is increased.o The number of collision domains is reduced.o The size of the collision domain is increased.2. 2. QuestionRefer to the exhibit. How many broadcast domains are there?CCNA1 v6.0 Chapter 8 Exam 005o 1o 2o 3o43. 3. QuestionWhat are two reasons a network administrator might want to create subnets?(Choose two.)o simplifies network designo improves network performanceo easier to implement security policieso reduction in number of routers neededo reduction in number of switches needed4. 4. QuestionRefer to the exhibit. A company uses the address block of 128.107.0.0/16 for its network. What subnet mask would provide the maximum number of equal size subnets while providing enough host addresses for each subnet in the exhibit?CCNA1 v6.0 Chapter 8 Exam 007o 255.255.255.0o 255.255.255.128o 255.255.255.192o 255.255.255.224o 255.255.255.2405. 5. QuestionRefer to the exhibit. The network administrator has assigned the LAN of LBMISS an address range of 192.168.10.0. This address range has beensubnetted using a /29 prefix. In order to accommodate a new building, the technician has decided to use the fifth subnet for configuring the newnetwork (subnet zero is the first subnet). By company policies, the router interface is always assigned the first usable host address and the workgroup server is given the last usable host address. Which configuration should be entered into the properties of the workgroup server to allow connectivity to the Internet?CCNA1 v6.0 Chapter 8 Exam 004o IP address: 192.168.10.65 subnet mask: 255.255.255.240, default gateway: 192.168.10.76o IP address: 192.168.10.38 subnet mask: 255.255.255.240, default gateway: 192.168.10.33o IP address: 192.168.10.38 subnet mask: 255.255.255.248, default gateway: 192.168.10.33o IP address: 192.168.10.41 subnet mask: 255.255.255.248, default gateway: 192.168.10.46o IP address: 192.168.10.254 subnet mask: 255.255.255.0, defaultgateway: 192.168.10.16. 6. QuestionIf a network device has a mask of /28, how many IP addresses are available for hosts on this network?o 256o 254o 62o 32o 16o 147. 7. QuestionWhich subnet mask would be used if 5 host bits are available?o 255.255.255.0o 255.255.255.128o 255.255.255.224o 255.255.255.2408. 8. QuestionHow many host addresses are available on the network 172.16.128.0 with a subnet mask of 255.255.252.0?o 510o 512o1022o 1024o 2046o 20489. 9. QuestionHow many bits must be borrowed from the host portion of an address to accommodate a router with five connected networks?o twoo threeo fouro five10. 10. QuestionA network administrator wants to have the same network mask for allnetworks at a particular small site. The site has the following networks and number of devices:IP phones – 22 addressesPCs – 20 addresses neededPrinters – 2 addresses neededScanners – 2 addresses neededThe network administrator has deemed that 192.168.10.0/24 is to be the network used at this site. Which single subnet mask would make the most efficient use of the available addresses to use for the four subnetworks?o 255.255.255.0o 255.255.255.192o 255.255.255.224o 255.255.255.240o 255.255.255.248o 255.255.255.25211. 11. QuestionA company has a network address of 192.168.1.64 with a subnet mask of255.255.255.192. The company wants to create two subnetworks that would contain 10 hosts and 18 hosts respectively. Which two networks wouldachieve that? (Choose two.)o 192.168.1.16/28o 192.168.1.64/27o 192.168.1.128/27o 192.168.1.96/28o 192.168.1.192/2812. 12. QuestionA network administrator is variably subnetting a network. The smallestsubnet has a mask of 255.255.255.248. How many usable host addresses will this subnet provide?o 4o 6o 8o 10o 1213. 13. QuestionRefer to the exhibit. Given the network address of 192.168.5.0 and a subnet mask of 255.255.255.224 for all subnets, how many total host addresses are unused in the assigned subnets?CCNA1 v6.0 Chapter 8 Exam 001o 56o 60o 64o 68o7214. 14. QuestionRefer to the exhibit. Considering the addresses already used and having to remain within the 10.16.10.0/24 network range, which subnet address could be assigned to the network containing 25 hosts?CCNA1 v6.0 Chapter 8 Exam 002o 10.16.10.160/26o 10.16.10.128/28o 10.16.10.64/27o 10.16.10.224/26o 10.16.10.240/27o 10.16.10.240/2815. 15. QuestionA network administrator needs to monitor network traffic to and fromservers in a data center. Which features of an IP addressing scheme should be applied to these devices?o random static addresses to improve securityo addresses from different subnets for redundancyo predictable static IP addresses for easier identificationo dynamic addresses to reduce the probability of duplicate addresses 16. 16. QuestionWhich two reasons generally make DHCP the preferred method of assigning IP addresses to hosts on large networks? (Choose two.)o It eliminates most address configuration errors.o It ensures that addresses are only applied to devices that require apermanent address.o It guarantees that every device that needs an address will get one.o It provides an address only to devices that are authorized to be connected to the network.o It reduces the burden on network support staff.17. 17. QuestionA DHCP server is used to assign IP addresses dynamically to the hosts on anetwork. The address pool is configured with 192.168.10.0/24. There are 3 printers on this network that need to use reserved static IP addresses from the pool. How many IP addresses in the pool are left to be assigned to other hosts?o 254o251o 252o 25318. 18. QuestionRefer to the exhibit. A company is deploying an IPv6 addressing scheme for its network. The company design document indicates that the subnet portion of the IPv6 addresses is used for the new hierarchical network design, with the s ite subsection to represent multiple geographical sites of the company, the s ub-site section to represent multiple campuses at each site, and thes ubnet section to indicate each network segment separated by routers. With such a scheme, what is the maximum number of subnets achievedper sub-site?CCNA1 v6.0 Chapter 8 Exam 003o 0o 4o16o 25619. 19. QuestionWhat is the prefix for the host address 2001:DB8:BC15:A:12AB::1/64?o 2001:DB8:BC15o 2001:DB8:BC15:Ao 2001:DB8:BC15:A:1o 2001:DB8:BC15:A:1220. 20. QuestionConsider the following range of addresses:2001:0DB8:BC15:00A0:0000::2001:0DB8:BC15:00A1:0000::2001:0DB8:BC15:00A2:0000::…2001:0DB8:BC15:00AF:0000::The prefix-length for the range of addresses is /6021. 21. QuestionMatch the subnetwork to a host address that would be included within the subnetwork. (Not all options are used.)CCNA1 v6.0 Chapter 8 Exam 0122. 22. QuestionRefer to the exhibit. Match the network with the correct IP address and prefix that will satisfy the usable host addressing requirements for each network. (Not all options are used.)CCNA1 v6.0 Chapter 8 Exam 006。
思科认证英文题库300-410
Exam : 300-410Title : Implementing Cisco EnterpriseAdvanced Routing andServicesVendor : CiscoVersion : DEMONO.1 An engineer configured the wrong default gateway for the Cisco DNA Center enterprise interface during the install.Which command must the engineer run to correct the configuration?A.sudo maglev-config updateB.sudo maglev install config updateC.sudo maglev reinstallD.sudo update config installAnswer: ANO.2 Which command displays the IP routing table information that is associated with VRF-Lite?A.show ip protocols vrfB.show run vrfC.show ip route vrfD.show ip vrfAnswer: CNO.3 Which statement about IPv6 RA Guard is true?A.It does not offer protection in environments where IPv6 traffic is tunneled.B.It is not supported in hardware when TCAM is programmed.C.It cannot be configured on a switch port interface in the ingress direction.D.Packets that are dropped by IPv6 RA Guard cannot be spanned.Answer: ANO.4 While troubleshooting connectivity issues to a router, these details are noticed:*Standard pings to all router interfaces, including loopbacks, are successful.*Data traffic is unaffected.*SNMP connectivity is intermittent.*SSH is either slow or disconnects frequently.Which command must be configured first to troubleshoot this issue?A.show interface | inc dropB.show ip routeC.show policy-map control-planeD.show policy-mapAnswer: CNO.5 Refer to the exhibit.Why is the remote NetFlow server failing to receive the NetFlow data?A.The flow exporter is configured but is not used.B.The destination of the flow exporter is not reachable.C.The flow monitor is applied to the wrong interface.D.The flow monitor is applied in the wrong direction.Answer: BNO.6 A network engineer is investigating a flapping (up/down) interface issue on a core switch thatis synchronized to an NTP server. Log output currently does not show the time of the flap. Which command allows the logging on the switch to show the time of the flap according to the clock on the device?A.service timestamps log uptimeB.clock calendar-validC.clock summer-time mst recurring 2 Sunday mar 2:00 1 Sunday nov 2:00D.service timestamps log datetime localtime show-timezoneAnswer: D。
思科ITE章考试原题及答案图文稿
思科ITE章考试原题及答案图文稿思科I T E章考试原题及答案集团文件版本号：（M928-T898-M248-WU2669-I2896-DQ586-M1988）清洁计算机内部可以减少以下哪种负面环境因素？灰尘在清洁计算机机箱内部时，直接喷射压缩空气容易损坏下列哪种组件？风扇在生产车间，一个家具工厂用笔记本电脑来实现进程监控和报告。
生产车间的环境温度大约为27 摄氏度（80 华氏度）。
湿度相当高，大约为70%。
风扇安装在通风口顶部。
这里的木屑灰尘非常多。
以下哪个条件最可能对在这一环境中使用的笔记本电脑产生不利影响？灰尘蔬菜罐头工厂使用笔记本电脑来监控生产线。
生产环境的环境温度大约是 24 摄氏度（75 华氏度）。
湿度约为 30%。
由于装罐设备的使用，因此噪音很高。
笔记本电脑放在一个木箱中，木箱三面距离笔记本电脑较近。
以下哪个因素最可能对在这一环境中使用的笔记本电脑产生不利影响？放置笔记本电脑的木箱科考队正在用笔记本电脑工作。
科学家们工作地点的温度范围为 -13 华氏度（-25 摄氏度）到 80 华氏度（27 摄氏度）。
湿度约为 40%。
噪声水平较低，但地形崎岖，风速可达每小时 45 英里（每小时 72 公里）。
在需要时，科学家们会停下脚步，用笔记本电脑输入数据。
下列哪一项条件最有可能对于在此环境下使用的笔记本电脑造成负面影响？温度以下哪一项是制定预防性维护计划的一部分？记录每项维护任务的详细信息和频率技术人员正在施工现场执行 PC 硬件维护。
作为预防性维护计划的一部分，技术人员应该执行什么任务？进气风扇除尘。
以下哪项任务应作为硬件维护例行程序的一部分？检查并固定任何松动的电缆。
在测试导致某个问题的若干可能原因时，应该首先测试哪类原因？最容易最明显的原因在解决计算机问题时可以使用下列哪两项物品来帮助制定行动计划（选择两项。
）计算机手册计算机维修历史记录日志为客户排除计算机故障之前应该备份哪两类数据（选择两项。
集美大学思科网络技术上级实验题目及答案翻译
实验1：第一章测试1 Which of the following are functions of a web browser without the addition of plug-ins? [Choose three.]（cde）下列哪项是一个没有插件的web浏览器的功能？解释：连接、接触服务器，请求、接受信息a. displays Quicktime movies 显示Quicktime电影b. displays flash animation 显示flash动画c. requests information .请求信息d. contacts web servers 接触web服务器e. receives information 接收信息f. updates IRQ…s更新IRQ的2 Why were TCP/IP protocols developed?（a）为什么TCP / IP协议开发?a. To allow cooperating computers to share resources across a network 允许合作的计算机通过网络共享资源b. To insure that error correction of each packet takes place. 对每个数据包发生的误差修正。
c. To allocate resources that are needed for operating a computer on a LAN. 在局域网内分配那些需要操作的电脑的资源d. To determine the "best path" decision making when forwarding packets of data.确定“最佳路径”转发数据包时的决策3 In an 8 bit binary number, what is the total number of combinations of the eight bits?（b）在一个8位二进制数,八个比特的组合的总数吗? 解释：0(0000 0000) - 255(1111 1111)a. 255b. 256c. 512d. 128e. 254f. 10244 Which statements best describe a physical connection? [Choose two.]哪个陈述最好的形容物理连接。
思科计算机网络题目及翻译3
实验报告用纸课程计算机网络基础日期2014 年5 月4日班级学号姓名成绩实验题目:实验4：第六七八章测试一、实验目的1.掌握Frame定义2.掌握以太网的相关知识二、实验内容1.What does a switch build as it reads MAC addresses that pass through it?交换机构建下列哪张表，通过它可以读取MAC地址？选择一项：a. Routing Topology table路由拓扑表b. Store and Forward list存储和转发列表c. MAC Route Address table MAC地址表d. Content Addressable Memory table内容可寻址存储表e. Cut-through domain直通域正确答案是：Content Addressable Memory table2.Which switching mode results in the lowest amount of latency and provides no error checking?下面哪种交换转发模式具有最低的延迟，但不提供错误的检查？选择一项：a. synchronous同步b. fragment-free无碎片转发c. cut-through 贯通转发d. store-and-forward存储转发正确答案是：cut-through3.What will a bridge do if it receives a frame with a MAC address that is not within the table?如果网桥收到一个MAC地址并不在表内的数据帧，将会如何处理？选择一项：a. ignore frame忽略数据帧b. send frame to appropriate port 发送到适当的端口c. discard frame丢弃帧d. send frame to all ports except source port 泛洪到除源端口外的其他端口正确答案是：send frame to all ports except source port4.Which of the following is a term associated with replacing hubs with switches to increase the number of collision domains?下列哪项是长期与交换机，以增加冲突域的数量代替集线器相联？选择一项：a. extended扩展b. encapsulation封装c. layered model分层模型d. latencye. broadcast domain广播域f. segmentation 分割正确答案是：segmentation5.Which of the following are not to be exceeded when implementing the 5-4-3-2-1 Rule? (Choose three.)下列哪项是实施5-4-3-2-1规则时不超过？（选择三项。
思科 cisco 课后习题答案
分界点：
19． 调制解调器： 语音调制解调器将计算机生成的数字信号转换为可通过公共电话网络的模拟线路传输的语音 频率； 速度越快的调制解调器（如有线电视调制解调器和 DSL 调制解调器）在传输时使用的带宽频 率也越高。 CSU/DSU： 数字线路（如 T1 或 T3 线路）需要信道服务单元（CSU）和数据服务单元（DSU） ； 这两者经常合并到一台设备中，名为 CSU/DSU； CSU 端接数字信号， 并通过纠错和线路监视确保连接的完整性； DSU 在 T 载波线路帧和 LAN 能够解释的帧之间进行转换。 接入服务器： 集中处理拨入和拨出用户通信。接入服务器可同时有模拟和数字接口，能够同时支持数百名 用户。 WAN 交换机： 运营商网络中使用的多端口互连设备。这些设备通常交换帧中继、ATM 或 X.25 等数据流。 路由器： 提供用于连接服务提供商网络的网络互联接口和 WAN 接入接口。 这些接口可以是串行接口或其他 WAN 接口。有些类型的 WAN 接口需要通过 DSU/CSU 或调制 解调器（模拟、有线电视或 DSL）等外部设备将路由器连接到服务提供商。 20. X.25： 一种低带宽的老式 WAN 技术，最大速度为 48kbit/s，读卡器通常使用拨号模式 X.25 向中央 计算机验证事务； 对这些应用来说，低带宽和高延时并不是问题，而低成本让 X.25 成为众家之选； 很多服务提供商已使用帧中继代替 X.25。 一种第 2 层 WAN 协议，通常提供 4Mbit/s 或更高的数据速度； 使用虚电路提供永久、共享的中等带宽连接，可同时传输语音和数据； VC 由 DLCI 唯一标识，这确保两台 DTE 设备之间能够进行双向通信。 异步传输模式（ATM）技术是一种基于信元而不是帧的架构，使用 53 字节的定长信元； 这些小型定长信元非常适合传输对延迟敏感的语音和视频数据流。
思科第一学期期末试题目及答案
1请参见图示。
主机 A 用户向主机 B 用户发送了一封电子邮件。
主机 A 发送了哪种类型的信息？广播组播同播单播2为了将PC 加入到网络环境中，应通过软件配置哪两个组件？（选择两项。
）MAC 地址IP 地址内核外壳(shell)子网掩码3哪两项是MAC 地址的特征？（选择两项。
）指示网络中主机的物理位置。
由DHCP 服务器动态分配。
以十六进制格式显示。
是物理地址。
是一种基于电缆的地址。
4哪种连接需要使用直通电缆？PC 端口至PC 端口PC 端口至路由器接口交换机端口至路由器端口交换机端口至交换机端口5路由器在收到包含广播MAC 地址的帧时会执行什么操作？它不会将该帧转发给另一个网络。
它会以其IP 地址作为回复将该帧转发回发送主机。
它会将帧从除该帧所在接口的其它所有接口转发出去。
它会将该帧转发回接收接口，以确保局域网中的所有主机都能收到。
6DNS 服务器的功能是什么？将IP 地址映射为MAC 地址。
将计算机或域名转换为相应的IP 地址。
管理客户端所在的域。
接收从客户端发来的HTTP 请求。
7哪两种网络故障与物理层相关？（选择两项。
）电缆和接头损坏编址不正确子网掩码不正确组件过热默认网关不正确8哪一层是主机进入网络的第一个进入点？核心层接入层网络层分布层9下列哪些是私有IP 地址的地址范围？（选择三项。
）10.0.0.0 到10.255.255.255200.100.50.0 到200.100.25.255150.150.0.0 到150.150.255.255172.16.0.0 到172.31.255.255192.168.0.0 到192.168.255.255127.16.0.0 到127.31.255.25510请参见图示。
一家组织的安全策略允许员工在家里连接办公室内部网。
这是一种什么安全策略？合理使用事件处理网络维护远程访问11请参见图示。
将Linksys 集成路由器上的安全模式设置为WEP 有什么作用？WEP 安全模式能够使接入点向客户端告知它的存在。
思科网络第一学期1-5章中文测试题及答案
ENetwork Chapter 2 - CCNA Exploration: 网络基础知识(版本4.0) 1在封装过程中，数据链路层执行什么操作？不添加地址。
添加逻辑地址。
添加物理地址。
添加进程的端口号。
2TCP/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3数据链路层封装添加的报尾信息有何主要功能？支持差错校验确保数据按照顺序到达确保送达正确目的标识本地网络中的设备帮助中间设备进行处理和路径选择4请参见图示。
下列哪组设备仅包含终端设备？A、C、DB、E、G、HC、D、G、H、I、JD、E、F、H、I、JE、F、H、I、J5OSI 模型各层从最高层到最低层的正确顺序如何？物理层、网络层、应用层、数据链路层、表示层、会话层、传输层应用层、物理层、会话层、传输层、网络层、数据链路层、表示层应用层、表示层、物理层、会话层、数据链路层、传输层、网络层应用层、表示层、会话层、传输层、网络层、数据链路层、物理层表示层、数据链路层、会话层、传输层、网络层、物理层、应用层6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)。
7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8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9请参见图示。
哪个术语正确判断出了包含于绿色区域中的设备类型？源终端传输中间10OSI 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11请参见图示。
CCNA第一学期Finalexam考试英文版答案
CCNA第一学期Finalexam考试英文版答案(R&S.)C 1A medium-sized business is researching available options for connecting to the Internet.Thecompany is looking for a high speed option with dedicated, symmetric access.Whichconnection type should the company choose?DSLdialupsatelliteleased linecable modem2What is the purpose of having a converged network?to provide high speed connectivity to all end devicesto make sure that all types of data packets will be treated equallyto achieve fault tolerance and high availability of data network infrastructure devicesto reduce the cost of deploying and maintaining thecommunication infrastructure3What characteristic of a network enables it to quickly grow to support new users andapplications without impacting the performance of the service being delivered to existing users?reliabilityscalabilityquality of serviceaccessibility4Which connection provides a secure CLI session with encryption to a Cisco switch?a console connectionan AUX connectiona Telnet connectionan SSH connection5A network technician is attempting to configure an interface by entering the followingcommand:SanJose(config)#ip address192.168.2.1255.255.255.0.The command isrejected by the device.What is the reason for this? The command is being entered from the wrong mode of operation.The command syntax is wrong.The subnet mask information is incorrect.The interface is shutdown and must be enabled before the switch will accept the IP address.6After several configuration changes are made to a router, the copy running-configurationstartup-configuration command is issued.Where will the changes be stored?flashROMNVRAMRAMthe configuration registera TFTP server7Refer to the exhibit.From global configuration mode,an administrator is attempting to create a message-of-the-day banner by using thecommand banner motd V Authorized access only!Violators will be prosecuted!V When users log in using Telnet,the banner does not appear correctly.What is the problem? The banner message is too long.The delimiting character appears in the banner message.The symbol“!”signals the end of a banner message.Message-of-the-day banners will only appear when a user logs in through the console port.8What are three characteristics of an SVI?(Choose three.) It is designed as a security protocol to protect switch ports.It is not associated with any physical interface on a switch.It is a special interface that allows connectivity by different types of media.It is required to allow connectivity by any device at any location.It provides a means to remotely manage a switch.It is associated with VLAN1by default.9A technician configures a switch with these commands: SwitchA(config)#interface vlan1SwitchA(config-if)#ip address192.168.1.1255.255.255.0 SwitchA(config-if)#no shutdownWhat is the technician configuring?Telnet accessSVIpassword encryptionphysical switchport access10In computer communication,what is the purpose of message encoding?to convert information to the appropriate form for transmissionto interpret informationto break large messages into smaller framesto negotiate correct timing for successful communication11What protocol is responsible for controlling the size of segments and the rate at whichsegments are exchanged between a web client and a web server?TCPIPHTTPEthernet12What are two benefits of using a layered network model? (Choose two.)It assists in protocol design.It speeds up packet delivery.It prevents designers from creating their own model.It prevents technology in one layer from affecting other layers.It ensures a device at one layer can function at the next higher layer.13What is the process of dividing a data stream into smaller pieces before transmission?segmentationencapsulationencodingflow control14When IPv4addressing is manually configured on a web server,which property of the IPv4configuration identifies the network and host portion for an IPv4address?DNS server addresssubnet maskdefault gatewayDHCP server address15A network administrator is troubleshootingconnectivity issues on a ing a tester,the administrator notices that the signals generated by the server NIC are distorted and not usable.In which layer of the OSI model is the error categorized?presentation layernetwork layerphysical layerdata link layer16A network engineer is measuring the transfer of bits across the company backbone for amission critical database application.The engineer notices that the network throughputappears lower than the bandwidth expected.Which three factors could influence thedifferences in throughput?(Choose three.)the amount of traffic that is currently crossing the networkthe sophistication of the encapsulation method applied to the datathe type of traffic that is crossing the networkthe latency that is created by the number of network devices that the data is crossingthe bandwidth of the WAN connection to the Internetthe reliability of the gigabit Ethernet infrastructure of the backbone17Which type of UTP cable is used to connect a PC to a switch port?consolerollovercrossoverstraight-through18What is a characteristic of the LLC sublayer?It provides the logical addressing required that identifies the device.It provides delimitation of data according to the physical signaling requirements of the medium.It places information in the frame allowing multiple Layer 3protocols to use the same network interface and media.It defines software processes that provide services to the physical layer.19What are the three primary functions provided by Layer 2data encapsulation?(Choosethree.)error correction through a collision detection methodsession control using port numbersdata link layer addressingplacement and removal of frames from the mediadetection of errors through CRC calculationsdelimiting groups of bits into framesconversion of bits into data signals20What will a host on an Ethernet network do if it receives a frame with a destination MACaddress that does not match its own MAC address?It will discard the frame.It will forward the frame to the next host.It will remove the frame from the media.It will strip off the data-link frame to check the destination IP address.21What are two actions performed by a Cisco switch? (Choose two.)building a routing table that is based on the first IP address in the frame headerusing the source MAC addresses of frames to build and maintain a MAC address tableforwarding frames with unknown destination IP addresses to the default gatewayutilizing the MAC address table to forward frames via the destination MAC addressexamining the destination MAC address to add new entries to the MAC address table22What are two examples of the cut-through switching method?(Choose two.)store-and-forward switchingfast-forward switchingCRC switchingfragment-free switchingQOS switching23Refer to the exhibit.If host A sends an IP packet to host B,what will the destination address be in the frame when it leaves host A?DD:DD:DD:DD:DD:DD172.168.10.99CC:CC:CC:CC:CC:CC172.168.10.65BB:BB:BB:BB:BB:BBAA:AA:AA:AA:AA:AA24What are two services provided by the OSI network layer?(Choose two.)performing error detectionrouting packets toward the destinationencapsulating PDUs from the transport layerplacement of frames on the mediacollision detection25What information is added during encapsulation at OSI Layer3?source and destination MACsource and destination application protocolsource and destination port numbersource and destination IP address26What are two functions of NVRAM?(Choose two.)to store the routing tableto retain contents when power is removedto store the startup configuration fileto contain the running configuration fileto store the ARP table27Refer to the exhibit.The network administrator for a small advertising company has chosen to use the192.168.5.96/27 network for internal LAN addressing.As shown in the exhibit,a static IP address is assigned to the company web server.However,the web server cannot access the Internet.The administrator verifies that local workstations with IP addresses that are assigned by a DHCP server can access the Internet,and the web server is able to ping local workstations.Which component is incorrectly configured?subnet maskDNS addresshost IP addressdefault gateway address28Why does a Layer3device perform the ANDing process on a destination IP address andsubnet mask?to identify the broadcast address of the destination networkto identify the host address of the destination hostto identify faulty framesto identify the network address of the destination network29What are the three ranges of IP addresses that are reserved for internal private use?(Choosethree.)10.0.0.0/864.100.0.0/14127.16.0.0/12172.16.0.0/12192.31.7.0/24192.168.0.0/1630Which three addresses are valid public addresses? (Choose three.)198.133.219.17192.168.1.24510.15.250.5128.107.12.117192.15.301.24064.104.78.22731What type of IPv6address is FE80::1?loopbacklink-localmulticastglobal unicast32Refer to the exhibit.On the basis of the output,which two statements about network connectivity are correct? (Choose two.)There is connectivity between this device and the device at192.168.100.1.The connectivity between these two hosts allows for videoconferencing calls.There are4hops between this device and the device at 192.168.100.1.The average transmission time between the two hosts is2 milliseconds.This host does not have a default gateway configured.33Which subnet would include the address192.168.1.96as a usable host address?192.168.1.64/26192.168.1.32/27192.168.1.32/28192.168.1.64/2934How many hosts are addressable on a network that has a mask of255.255.255.248?268141625435Which statement is true about variable-length subnet masking?Each subnet is the same size.The size of each subnet may be different,depending on requirements.Subnets may only be subnetted one additional time.Bits are returned,rather than borrowed,to create additional subnets.36Refer to the exhibit.Consider the IP address of 192.168.10.0/24that has been assigned to a high school building.The largest network in this building has100 devices.If192.168.10.0is the network number for the largest network,what would be the network number for thenext largest network,which has40devices?192.168.10.0192.168.10.128192.168.10.192192.168.10.224192.168.10.24037In what two situations would UDP be the preferred transport protocol over TCP?(Choosetwo.)when applications need to guarantee that a packet arrives intact,in sequence,and unduplicatedwhen a faster delivery mechanism is neededwhen delivery overhead is not an issuewhen applications do not need to guarantee delivery of the datawhen destination port numbers are dynamic38What important information is added to the TCP/IPtransport layer header to ensurecommunication and connectivity with a remote network device?timing and synchronizationdestination and source port numbersdestination and source physical addressesdestination and source logical network addresses39What is the TCP mechanism used in congestion avoidance? three-way handshakesocket pairtwo-way handshakesliding window40Which three statements characterize UDP?(Choose three.)UDP provides basic connectionless transport layer functions.UDP provides connection-oriented,fast transport of data at Layer 3.UDP relies on application layer protocols for error detection.UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.UDP relies on IP for error detection and recovery.UDP provides sophisticated flow control mechanisms.41Which two tasks are functions of the presentation layer? (Choose two.)compressionaddressingencryptionsession controlauthentication42Which two protocols operate at the highest layer of the TCP/IP protocol stack?(Choose two.)DNSEthernetIPPOPTCPUDP43Which two roles can a computer assume in a peer-to-peer network where a file is beingshared between two computers?(Choose two.)clientmasterserverslavetransient44What is the function of the HTTP GET message?to request an HTML page from a web serverto send error information from a web server to a web clientto upload content to a web server from a web clientto retrieve client email from an email server using TCP port11045A wireless host needs to request an IP address.What protocol would be used to process therequest?FTPHTTPDHCPICMPSNMP46When planning for network growth,where in the network should packet captures take place toassess network traffic?on as many different network segments as possibleonly at the edge of the networkbetween hosts and the default gatewayonly on the busiest network segment47When applied to a router,which command would help mitigate brute-force password attacksagainst the router?exec-timeout30service password-encryptionbanner motd$Max failed logins=5$login block-for60attempts5within6048Refer to the exhibit.An administrator is testing connectivity to a remote device with the IP address10.1.1.1.What does the output of this command indicate?Connectivity to the remote device was successful.A router along the path did not have a route to the destination.A ping packet is being blocked by a security device along the path.The connection timed out while waiting for a reply fromthe remote device.。
思科第一学期第1章测试答案
1. Which of the following descriptions are true regarding the management connections on a Cisco router? (Choose three.)- They are non-network connections.They are used to connect the router to the rest of the production network.They are synchronous serial ports.- They are used for initial router configuration.- They are asynchronous serial ports.They are accessed using their assigned IP address.2. The console port can be used for which of the following? (Choose three.)- debugging.- password recovery.routing data between networks.- troubleshooting.connecting one router to another.3. Which of the following describes the function of a WAN?connects peripherals in a single location.connects multiple networks in a single building.provides connectivity on a LAN.- provides connectivity over a large geographic area.4. An internetwork must include which of the following? (Choose three.)- switching.static addressing.IETF standardization.- dynamic or static routing.- consistent end-to-end addressing.5. ABC Company just purchased three new routers to start their company network. Which items are needed to establish a terminal session between a PC and the router for the initial configuration? (Choose three.)straight-through cable.- terminal emulation software.- rollover cable.- RJ-45 to DB-9 connector.V.35 cable.6.Terminal emulation software, such as HyperTerminal, can be used to configure a router. Which of the following HyperTerminal options shown in the graphic are correctly set to allow configuration of a Cisco router? (Choose three.)bits per second.- data bits.- parity.- stop bits.flow control.7. Which of the following devices are used in the construction of a WAN? (Choose three.)hubs.- routers.- communication servers.transceivers.- modems.multi-port repeaters.8. Which of the following are functions of RAM? (Choose three.)contains startup configuration file.- stores routing table.- holds fast switching cache.retains contents when power is removed.- stores running configuration file.9. Why is a console connection to a router or switch preferred when troubleshooting? (Choose two.)can be accessed remotely.- does not depend on network services.- displays startup and error messages by default.does not require special components.10. Which basic components do a router and a standard desktop PC have in common? (Choose three.)- CPU.hard drive.- input/output interfaces.keyboard.monitor.- system bus.11. During the initial configuration of a 2600 series Cisco router, which cable is required for connecting a PC to the console port?twisted.crossover.- rollover.straight.12. A router is composed of many internal components. Which of the following components stores a copy of the router's configuration file?metal-oxide memory.read only memory.flash memory.- non-volatile random access memory.13. What contains the instructions that a router uses to control the flow of traffic through its interfaces?packet configuration.- configuration files.flash memory.internal components.14. Several Ethernet hosts on a LAN need the gateway services of a Cisco 2500 series router. Which of the following would be needed to physically connect a router to all of the hosts on the LAN? (Choose two.)a crossover cable between the transceiver on a router and a switch.a crossover cables between a switch and hosts on a LAN.a straight-through cable between the auxiliary port on a router and a switch.a rollover cable between the console port on a router and a switch.- straight-through cables between a switch and hosts on a LAN.- a straight-through cable between the transceiver on a router and a switch.15. Which router component holds the configuration file when power is lost? volatile random access memory.read only memory.- non-volatile random access memory.flash memory.16. Which of the following layers of the OSI model are incorporated in WAN standards? (Choose two.)- physical layer.application layer.transport layer.- data link layer.session layer.17. Which of the following are true regarding router interfaces? (Choose three.) provide temporary memory for the router configuration files.- connect the router to the network for packet entry and exit.- can be on the motherboard or a separate module.hold the IOS image.- connect the router to LANs and WANs.18. Which of the following tasks can be accomplished through a management connection on a router? (Choose three.)- troubleshooting problems.- monitoring the system.capturing LAN data packets.- configuring the router.routing data packets.19. What do routers use to select the best path for outgoing data packets?ARP tables.bridging tables.- routing tables.switching tables.20. Which of the following are functions of NVRAM? (Choose two.)stores the routing table.- retains contents when power is removed.- stores the startup configuration file.contains the running configuration file.stores the ARP table.21. Select the statements that correctly describe flash memory in a 2600 series router? (Choose two.)holds the startup configuration by default.- can be upgraded with single in-line memory modules.- stores Cisco IOS software images.stores routing table information by default.maintains the only copy of an IOS image after the router is booted.。
思科第1学期期末考试答案
0 points for any other option
2
11
窗体顶端
路由器将按哪个默认顺序搜索启动配置信息？
NVRAM、RAM、TFTP
NVRAM、TFTP、设置模式
设置模式、NVRAM、TFTP
TFTP、ROM、NVRAM
闪存、ROM、设置模式
窗体底端
需要正确接地连接
绞合反向的电路线对
用金属屏蔽裹住线束
设计电缆基础设施避免串扰干扰
避免在安装时出现弯曲
窗体底端
在铜缆中，串扰是一条电线上的信号与相邻电线上的信号形成电场或磁场引起的干扰。绞合反向的电路线对可以有效地消除串扰。其他选项是消除EMI和RFI负面影响的有效措施，而不能消除串扰。
答案
说明
最高分值
0 points for any other option
2
10
窗体顶端
在传输过程中，IPv4数据包报头中的哪个字段通常会保持不变？
标志
生存时间
数据包长度
目的地址
窗体底端
在传输过程中，IPv4报头中的“目的地址”字段将保持不变。在传输过程中其他选项可能会发生变化。
答案
说明
最高分值
correctness of response
窗体底端
接口VLAN 1是交换机上的虚拟接口，称为SVI（交换机虚拟接口）。配置默认SVI（接口VLAN 1）上的IP地址可以远程访问交换机。还必须配置VTY线路允许远程访问，但是该线路上不能配置IP地址。
答案
说明
最高分值
correctness of response
2 points for Option 2
思科第一学期期末考试最新答案[范文模版]
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思科第一学期期末考试最新答案[范文模版]第一篇：思科第一学期期末考试最新答案[范文模版]要将数据包发送到远程网络，应使用哪种设备？访问交换机DHCP 服务器集线器路由器OSI 哪一层使用面向连接的协议来确保数据的可靠传输？应用层表示层会话层传输层请参见图示。
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。
请参见图示。
包含路由器B 的网络遇到问题。
助理网络工程师已确定此网络的问题出在路由行什么操作可以纠正该网络问题？在接口 Serial 0/0/0 上发出 clock rate 命令在接口 Serial 0/0/1 上发出 description 命令在接口 FastEthernet 0/0 上发出 ip address 命令在接口 FastEthernet 0/1 上发出 no shutdown 命令00-08-a3-b6-ce-46198.133.219.25:80C 172.18.0.0/24 is directly connected, FastEthernet0/0 请参见图示。
对于从主机A 向Web 服务器发出的网页请求，正确的目的套接字数字是什么在 Cisco IOS 设备中，启动配置文件存储于何处？闪存NVRAM RAM ROM在配置路由器时，网络技术人员想要命名路由器。
输入hostname 命令后，技术人员会看到下列示？Router> Router#Router(config)#Router(config-line)#下列哪三个IPv4 地址代表子网的广播？（选择三项）（主机为1）172.16.4.63 /26172.16.4.129 /26172.16.4.191 /26172.16.4.51 /27172.16.4.95 /27172.16.4.221 /27网络管理员想要限制访问路由器的特权执行模式。
思科CCNA第一学期期末考试答案Final
1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？0 到2550 到10231024 到4915149152 到655352以下哪组网络ID 和子网掩码正确标识了从172.16.128.0 到172.16.159.255 的所有IP 地址？172.16.128.0 255.255.255.224172.16.128.0 255.255.0.0172.16.128.0 255.255.192.0172.16.128.0 255.255.224.0172.16.128.0 255.255.255.1923以下哪个OSI 协议层提供面向连接的可靠数据通信服务？应用层演示文稿会话传输层network4何时必须使用clock rate命令配置路由器串行接口？当该接口充当DTE 设备时当该接口计时器已经清除时当连接的DTE 设备关闭时当该接口充当DCE 设备时5下列哪些是私有IP 地址的地址范围？（选择三项。
）10.0.0.0 到10.255.255.255200.100.50.0 到200.100.25.255150.150.0.0 到150.150.255.255172.16.0.0 到172.31.255.255192.168.0.0 到192.168.255.255127.16.0.0 到127.31.255.2556请参见图示。
每条介质链路都已标记。
应该使用哪种类型的电缆连接不同设备？连接 1 - 全反电缆连接 3 - 交叉电缆连接 1 - 交叉电缆连接 3 - 交叉电缆连接 1 - 直通电缆连接 3 - 交叉电缆连接 1 - 直通电缆连接 3 - 直通电缆连接 1 - 交叉电缆连接 3 - 交叉电缆7请参见图示。
IP 地址192.168.33.2 代表什么？主机的默认网关。
主机的IP 地址。
主机的首选域名服务器。
网站resolver1.mooki.local 的IP 地址。
主机的主页IP 地址。
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。
cisco试题及答案分析
Cisco试题保存路由器配置文件问题：Which command will copy the routers configuration script from RAM to NVRAM?A. copy running-config startup-configB.NVRAM is read-only,so this is not possible.C. copy allD. save ramE. save ram nvramSelect the 1 best answer题目大意：那个命令是将路由器的配置文件从RAM中拷贝到NVARM中。
题解：RAM ：相当于计算机的内存，但掉电的时候，内存里面的东西将会丢失。
NVARM：相当于计算机的硬盘，但掉电的时候，硬盘里面的东西不会丢失。
在语句中的Running-config 是存在于RAM中，Startup- config 存在于NVRAM，"copy running-config startup-config" 是一个COPY命令，讲RAM中的数据或配置文件拷贝到NVARM中。
同时在实际中可以用copy run start来简写这个命令。
正确答案：A参考资料：CCNA：Cisco Certified Network Associate Study Guide Fourth Edition------Page194：Hands-on Lab 4.3：Saving a Router ConfigurationCisco试题:路由协议考题分析问题：The acronym BGP stands for which protocol?A.Backgroud Gateway ProtocolB.Backdoor Gateway ProtocolC.Border Gateway ProtocolD.Basic Gateway ProtocolSelect the 1 best answer题目的意思：BGP是下面那个协议的缩写？正确答案：C题解：BGP is an acronym for Border Gateway protocolBGP：边界网关协议。
第一册汉译英翻译答案
第一册汉译英翻译答案Unit OnePassage A.1.He has no longer been writing to his friends ever since he got a mobile phone.2.Even though he is very busy, he spends at least two hours every day surfing theInternet in order to find out about / learn about the latest developments in this field.3.Professor Li gave a short speech at the commencement. His words were / What hesaid was strongly impressed upon my memory.4.Talking of the final exams the students were not nervous at all. There was fullconfidence on every one’s face.5.To write a short passage of about 100 words in 30 minutes would be a snap tomost students in their class.Passage B.1.I’ve found myself having great interest in spoken English.2.Driving on the highway, I realized that enormous changes has taken place inChina’s highway system in recent years.3.I can hardly believe that he ahs learned how to work a computer so quickly / insuch a short time.4.Three years has passed and, the final moment has come. In less than two weeks, Iwill return home / go back to my country.5.I know a lot of people who can’t wait to go abroad, but I prefer to say with myfamily in my own country.Unit TwoPassage A1.His life experiences have always been playing a big role in his academic career.2.The restaurant has recently extended it opening hours / business hours.3.I’ve just read an interesting book which has a new approach to Shakespeare.4.With the wide use of email, the issue of spam has drawn much concern.5.In traditional / conventional education there are more limitations oncommunication and interaction between teachers and students than there are in online education.Passage B1.Jim had no intention of arguing /to argue with him, since it’s obvious who wasright and who was wrong.2.To my surprise, it was the chance meeting with Prof. Wilson that later onafforded me an opportunity to study at his university as an exchange student.3.Our university will extend the opening hours of the library and the classrooms tomeet the students’ needs at the highest possible level.4.The development of information technology has begun to have profound effectson all aspects of social life.5.We have no doubt that, with his high level of English, he will surely have anexcellent performance in the university-wide English speech contest.Unit ThreePassage A1.Something is wrong with the piano, but I can’t put my finger on what it is.2.Apart from being too large, the trousers don’t match my jacket, either.3.I love pop music, for whatever reasons.4.He has great interest in foreign cultures, often browsing through piles of books tolook of any useful information.5.Opinions on whether we should start a new society vary a great deal.Passage B.1.You can’t get to the island other than by boat.2.Some students are crazy about pop music while others prefer classical music.3.The media are playing an increasingly important role in leading fashions andtrends.4.I tried every means to get a copy of his newly issued album, but failed.5.Without the encouragement and help of my friends, I would have quit school. Unit FourPassage A.1.I have faxed my resume and a cover letter to that company, but I haven’t receiveda reply yet.2.John will not hesitate for a second to offer help when others are in trouble.3.I have to admit that I desire very much to work or study abroad for some time butI know it is not easy to get a visa.4.It was not until 2 years after he arrived in London that he found / took a job in aninternational bank.5.After finishing his teaching, Tom traveled throughout China for 2 months beforereturning home in America.Passage B1.It was the first time for the freshmen to attend an American professor’s lecture,and they had trouble understanding what he was talking about for the first twenty minutes.2.There are still ten minutes left. Now that you have finished your test you mayhand it in now.3.It took them nearly three months before they made their final decisions withouthurting anybody’s feelings.4.It is appropriate to Chinese college students to learn at least one foreign languagebefore they graduate so that they can keep up the world’s advanced science andtechnology.5.Mr. Smith was a hard-working movie director and at the same time he was aresponsible father.Unit FivePassage A1.The audience must have missed their musical performance, or they would havespoken highly of it.2.Somehow she could sense her mother’s deep concern though she was far awayfrom home.3.The operator had to spend two hours or so on her way from her home toworkplace every day.4.He appreciated her sympathy and understanding, which meant a lot to him duringthat time.5.She finally arrived at a telephone booth and put in the coins before dialing Paris. Passage B1.The better you can use a computer, the more likely you are to find a job as asecretary.2.He likes to share information with his colleagues by email rather than bytelephone.3.For Americans, it’s hard to imagine living in a place where there are no cars.4.They came to the conclusion that it’ll be cheaper in the long run to use real leatherbecause it will last longer.5.These days he has been involved in seeking out effective websites.Unit SixPassage A.1.Little did I know that things would turn out like that.2.He wasn’t keen on buying a car, but I talked him into it.3.Being a volunteer in the 2008 Beijing Olympic Games would be aonce-in-a-lifetime experience for me.4.Cigarette smoking is a major factor contributing to lung cancer.5.The two universities will unite to stage an art show next month.Passage B1.Beijing will host the 29th Summer Olympic Games in the year 2008.2.Plenty of fresh air contributes to good health.3.No matter what happened, he would not say a word.4.I learned from her that you undertook another important job as well.5.I long to have the opportunity of participating in the volunteer activities for the2008 Beijing Olympics.Unit SevenPassage A1.The trade negotiation is a big success, so it can be uniquely beneficial to bothparties.2.Our classmates have been involved, one way or another, in the activities organizedby the Student Union.3.It’s one of the most desirable jobs available to a man without higher education.4.Doing research can spur undergraduate students’independent thinking andeffective learning.5.The cost of tuition continues to climb each year, which has constituted a heavyburden upon students from poverty-stricken backgrounds.Passage B1.The new era calls for creativity among the work force, rather than just loyalty tothe employer.2.The shipping company, starting with nothing in 1952, has bloomed into a leadingenterprise in the shipping industry.3.Haier’s success lies in its management system that has been envied and emulatedworldwide.4.The joint venture has set a goal of increasing this year’s total sales by 50%.5.I’ve tried to stop smoking several times, but it’s really difficult for me to quitsmoking for good.Unit EightPassage A1.In his poem, Robert Burns compares the girl he loves to a rose.2.No matter how busy you are, you should try to make it back to the class reunion.3.After her divorce she needed a shoulder to cry on.4.He graduated 20 years ago, so he could barely recognize his former classmates.5.Nothing can replace the friendship between intimate friends.Passage B1.He ordered a bunch of roses for his sweetheart in advance from the florist forValentine’s Day.2.She couldn’t endure to live in loneliness and solitude after her husband’s death.3.Should I ever find out her address, I’ll forward it to you immediately.4.You’d better take some chocolates with you in case you want to cheer her up.5.This is such an amusing romantic novel, it should certainly provoke your interest.。
思科第十章Routing and Switching Essentials 英文 答案
1. A ping fails when performed from router R1 to directlyconnected router R2. The network administrator thenproceeds to issue the show cdp neighbors command. Why would the network administrator issue this command if the ping failed between the two routers?•The network administrator suspects a virus because the ping command did not work.•The network administrator wants to verify Layer 2 connectivity.•The network administrator wants to verify the IP address configured on router R2.•The network administrator wants to determine if connectivity can be established from a non-directly connected network.2. Which statement is true about CDP on a Cisco device?•The show cdp neighbor detail command will reveal the IP address of a neighbor only if there is Layer 3 connectivity.•To disable CDP globally, the no cdp enable command in interface configuration mode must be used.•CDP can be disabled globally or on a specific interface.•Because it runs at the data link layer, the CDP protocol can only be implemented in switches.3. Why would a network administrator issue the show cdpneigbors command on a router?•to display device ID and other information about directly connected Cisco devices•to display router ID and other information about OSPF neighbors•to display line status and other information about directly connected Cisco devices•to display routing table and other information about directly connected Cisco devices4. Refer to the exhibit. Routers R1 and R2 are connected via aserial link. One router is configured as the NTP master, and the other is an NTP client. Which two pieces of information can be obtained from the partial output of the show ntpassociations detail command on R2? (Choose two.)•Both routers are configured to use NTPv2.•Router R1 is the master, and R2 is the client.•Router R2 is the master, and R1 is the client.•The IP address of R1 is 192.168.1.2.•The IP address of R2 is 192.168.1.2.5. Which two statements are true about NTP servers in anenterprise network? (Choose two.)•There can only be one NTP server on an enterprise network.•All NTP servers synchronize directly to a stratum 1 time source.•NTP servers at stratum 1 are directly connected to an authoritative time source.•NTP servers ensure an accurate time stamp on logging and debugging information.•NTP servers control the mean time between failures (MTBF) for key network devices.6. The command ntp server 10.1.1.1 is issued on a router. Whatimpact does this command have?•determines which server to send system log files to•identifies the server on which to store backup configurations•ensures that all logging will have a time stamp associated with it•synchronizes the system clock with the time source with IP address 10.1.1.17. Refer to the exhibit. Which two conclusions can be drawnfrom the syslog message that was generated by the router?(Choose two.)•This message resulted from an unusual error requiring reconfiguration of the interface.•This message indicates that the interface should be replaced.•This message is a level 5 notification message.•This message indicates that service timestamps have been configured.•This message indicates that the interface changed state five times.8. Which protocol or service allows network administrators toreceive system messages that are provided by networkdevices?•syslog•NTP•SNMP•NetFlow9. Which syslog message type is accessible only to anadministrator and only via the Cisco CLI?•errors•debugging•emergency•alerts10. Refer to the exhibit. From what location have thesyslog messages been retrieved?•syslog server•syslog client•router RAM•router NVRAM11. Refer to the exhibit. What does the number17:46:26.143 represent?•the time passed since the syslog server has been started•the time when the syslog message was issued•the time passed since the interfaces have been up•the time on the router when the show logging command was issued12. What is used as the default event logging destinationfor Cisco routers and switches?•terminal line•syslog server•console line•workstation13. A network administrator has issued the logging trap 4global configuration mode command. What is the result of this command?•After four events, the syslog client will send an event message to the syslog server.•The syslog client will send to the syslog server any event message that has a severity level of 4 and higher.•The syslog client will send to the syslog server any event message that has a severity level of 4 and lower.•The syslog client will send to the syslog server event messages with an identification trap level of only 4.14. What is the major release number in the IOS imagename c1900-universalk9-mz.SPA.152-3.T.bin?• 2• 3•15•52•190015. What statement describes a Cisco IOS image with the“universalk9_npe” designation for Cisco ISR G2 routers?•It is an IOS version that can only be used in the United States of America.•It is an IOS version that provides only the IPBase feature set.•It is an IOS version that offers all of the Cisco IOS Software feature sets.•It is an IOS version that, at the request of some countries, removes any strong cryptographic functionality.16. What code in the Cisco IOS 15 image filename c1900-universalk9-mz.SPA.153-3.M.bin indicates that the file isdigitally signed by Cisco?•SPA•universalk9•M•mz17. Which two conditions should the networkadministrator verify before attempting to upgrade a Cisco IOS image using a TFTP server? (Choose two.)•Verify the name of the TFTP server using the show hosts command.•Verify that the TFTP server is running using the tftpdnld command.•Verify that the checksum for the image is valid using the show version command.•Verify connectivity between the router and TFTP server using the ping command.•Verify that there is enough flash memory for the new Cisco IOS image using the show flash command.18. A network administrator configures a router with thecommand sequence:R1(config)# boot system tftp://c1900-universalk9-mz.SPA.152-4.M3.binR1(config)# boot system romWhat is the effect of the command sequence?•On next reboot, the router will load the IOS image from ROM.•The router will copy the IOS image from the TFTP server and then reboot the system.•The router will load IOS from the TFTP server. If the image fails to load, it will load the IOS image from ROM.•The router will search and load a valid IOS image in the sequence of flash, TFTP, and ROM.19. A network engineer is upgrading the Cisco IOS imageon a 2900 series ISR. What command could the engineer use to verify the total amount of flash memory as well as howmuch flash memory is currently available?•show flash0:•show version•show interfaces•show startup-config20. Beginning with the Cisco IOS Software Release 15.0,which license is a prerequisite for installing additionaltechnology pack licenses?•IPBase•DATA•UC•SEC21. Which three software packages are available for CiscoIOS Release 15.0?•DATA•IPVoice•Security•Enterprise Services•Unified Communications•Advanced IP Services22. When a customer purchases a Cisco IOS 15.0 softwarepackage, what serves as the receipt for that customer and is used to obtain the license as well?•Software Claim Certificate•End User License Agreement•Unique Device Identifier•Product Activation Key23. In addition to IPBase, what are the three technologypacks that are shipped within the universal Cisco IOSSoftware Release 15 image? (Choose three.)•Advanced IP Services•Advanced Enterprise Services•DATA•Security•SP Services•Unified Communications24. Which command would a network engineer use to findthe unique device identifier of a Cisco router?•show version•show license udi•show running-configuration•license install stored-location-url25. Which command is used to configure a one-timeacceptance of the EULA for all Cisco IOS software packages and features?•license save•show license•license boot module module-name•license accept end user agreement。
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1请参见图示。
根据显示的配置信息，哪三类802.11网络可以访问该WLAN？（选择三项）802.11a802.11b802.11e802.11g802.11n802.11x2下列哪一项是对DNS最准确的描述？DNS servers are used to map an IP address to a physical address.DNS servers are used to map a name to an IP address.DNS servers are used to configure logical address information for host computers.DNS servers are used to translate from private addresses to public addresses.请参见图示。
在Linksys集成路由器上安装什么功能可以将私有IP地址转换为可路由的Internet地址？身份验证DHCP加密防火墙NAT WEP4下面哪些是TCP/IP模型的传输层协议？（选择两项。
）FTP UDP SMTP TFTP TCP5下列哪一项准确描述了分布层中的网络设备？They are designed to interconnect individual hosts.They are designed to interconnect multiple companies。
They are designed to interconnect local network segments.They are designed to switch data packets as fast as possible.6在本地网络中，计算机要想成功连接网络，哪两项必须是唯一的？（选择两项。
）I P address subnet mask computer name default gateway addressoperating system version7下列关于本地和网络应用程序的陈述，哪三项是正确的？（选择三项）A local application is loaded in a local computer and can be accessed by a remote computer on the network.A network application is loaded in a local computer and accessed from a remote computer.A local application is loaded in a local computer and accessed only by the local computerA network application is loaded in a local computer and accessed only by the local computerAn example of a local application is e-mail.A n example of a network application is instant messaging.8一台主机发送报文，本地网络上的所有其它主机接收并处理该报文。
请问所有这些主机属于哪种类型的域？local domain multicast domain collision domain broadcast domain9客户与ISP之间规定正常运行时间和服务响应时间要求的合同名称是什么？DSL IAB NAP SLA10请参见图示。
假设图中显示的是连接到Linksys集成路由器的主机的输出。
应该首先检查下列哪一项？IP address on the host IP address on the routersubnet mask on the host default gateway on the hostlink status LED on the front of the router11“衰减”一词在数据通信中是什么意思？loss of signal strength as distance increasestime for a signal to reach its destinationleakage of signals from one cable pair to anotherstrengthening of a signal by a networking device12下列哪些是私有IP地址的地址范围？（选择三项。
）10.0.0.0to10.255.255.255200.100.50.0to200.100.25.255150.150.0.0to150.150.255.255172.16.0.0to172.31.255.255192.168.0.0to192.168.255.255127.16.0.0to127.31.255.25513下列哪两项正确描述了媒体访问控制(MAC)地址？（选择两项。
）MAC addresses are used to identify a specific NICMAC addresses are physical addresses。
MAC addresses contain a network number and unique host identification.MAC addresses are always assigned to network devices by a network administrator。
MAC addresses can be dynamically assigned.14路由器在收到包含广播MAC地址的帧时会执行什么操作？It will not forward the frame to another network.It forwards the frame back to the sending host with its IP address as a response.It forwards the frame out of all interfaces except the interface where the frame was received.It forwards the frame back out the receiving interface to insure all hosts on the local network receive it.15在考虑购买新的操作系统时，“总拥有成本”意味着什么？applications and support costshardware and support costshardware and software costshardware, software, and support costshardware, operating system, and applications costs16下列哪两项属于存储外围设备？（选择两项。
）printer flash drive headphones external DVD barcode reader17ISP是什么？It is a standards body that develops cabling and wiring standards for networking.It is a protocol that establishes how computers within a local network communicate.It is an organization that allows individuals and businesses to connect to the Internet.It is a networking device that combines the functionality of several different networking devices in one.18请参见图示。
在Network Name字段中分配名称Academy有何作用？It identifies the wireless LAN.It translates IP addresses into easy-to-remember domain names.It encrypts data between the wireless client and the access point.It allows access to the AP configuration GUI by name rather than address.It translates an internal address or group of addresses into an outside, public address. 19单个AP覆盖的区域称为什么？ad-hoc network basic service set independent basic service setextended service set distribution system20如果当前操作系统受到损坏而无法正常运行，那么应该选择哪种安装方案？upgrade multi-boot clean install virtualization21交叉电缆如何实现两台“类似设备”（例如两台交换机）的通信？The transmit pins are disconnected and only the receive pins are used.The transmit pins on one device are connected to the transmit pins on the other device.The receive pins on one device are connected to the receive pins on the other device.The transmit pins on one device are connected to the receive pins on the other device.22下面是TCP/IP数据封装从源主机传送到目的主机的步骤，其中哪一项是正确的顺序？A. converts data to bits for transmissionB. packages the data for end to end transportC. adds the data-link header and trailerD. adds the network IP address to the header of the frameA,B,C,D A,C,D,B B,D,C,A B,C,D,A D,C,B,A23请参见图示。