ccna1_8测试真题

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CCNA中文版试题

CCNA认证试题一（附答案和解析）中文版(一)1、目前，我国应用最为广泛的LAN标准是基于（）的以太网标准.(A) IEEE 802.1 (B) IEEE 802.2 (C) IEEE 802.3 (D) IEEE 802.5答案：C 现有标准：IEEE 802.1 局域网协议高层；IEEE 802.2 逻辑链路控制；IEEE 802.3 以太网IEEE 802.4 令牌总线；IEEE 802.5 令牌环IEEE 802.8 FDDIIEEE 802.11 无线局域网；记住IEEE802.1-------IEEE802.5的定义以太网是一种计算机局域网组网技术。

IEEE制定的IEEE 802.3标准给出了以太网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准，如令牌环、FDDI和ARCNET。

以太网的标准拓扑结构为总线型拓扑，但目前的快速以太网（100BASE-T、1000BASE-T标准）为了最大程度的减少冲突，最大程度的提高网络速度和使用效率，使用交换机（Switch）来进行网络连接和组织，这样，以太网的拓扑结构就成了星型，但在逻辑上，以太网仍然使用总线型拓扑的C***A/CD介质访问控制方法。

电气电子工程师协会或IEEE（Institute of Electrical and Electronics Engineers）是一个国际性的电子技术与信息科学工程师的协会。

建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万。

专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志，学报，书籍和每年组织300多次专业会议。

IEEE定义的标准在工业界有极大的影响。

下面列出：IEEE802．3以太网标准802.3--------- 10Base以太网标准； 802.3u-------- 100Base-T（快速以太网）802.3z-------- 1000Base-X（光纤吉比特以太网）802.3ab-------- 1000Base-T（双绞线吉比特以太网）2、对于这样一个地址,192.168.19.255/20,下列说法正确的是: （）(A) 这是一个广播地址(B) 这是一个网络地址(C) 这是一个私有地址(D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上(F) 这是一个公有地址答案：CE注：IP地址中关键是看她的主机位，将子网掩码划为二进制，1对应上面的地址是网络位，0对应的地址是主机位192.168.19.255/20划为二进制为：11000000.10101000.00010011.1111111111111111.11111111.11110000.00000000主机位变成全0表示这个IP的网络地址主机槐涑扇?表示这个IP的广播地址RFC1918文件规定了保留作为局域网使用的私有地址：10.0.0.0 - 10.255.255.255 (10/8 prefix)172.16.0.0 - 172.31.255.255 (172.16/12 prefix)192.168.0.0 - 192.168.255.255 (192.168/16 prefix)3、Quidway系列路由器在执行数据包转发时，下列哪些项没有发生变化（假定没有使用地址转换技术）？（）(A) 源端口号(B) 目的端口号(C) 源网络地址(D) 目的网络地址(E) 源MAC地址(F) 目的MAC地址答案：ABCD路由功能就是指选择一条从源网络到目的网络的路径，并进行数据包的转发。

Cisco CCNA 认证考试最新真题

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

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。

CCNA认证精彩试题中文+问题详解

CCNA认证试题一（附答案和解析）中文版(一)1、目前，我国应用最为广泛的LAN标准是基于（）的以太网标准.(A) IEEE 802.1(B) IEEE 802.2(C) IEEE 802.3(D) IEEE 802.5答案：C参考知识点：现有标准：IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802.3 以太网IEEE 802.4 令牌总线IEEE 802.5 令牌环IEEE 802.8 FDDIIEEE 802.11 无线局域网记住IEEE802.1-------IEEE802.5的定义以太网是一种计算机局域网组网技术。

IEEE制定的IEEE 802.3标准给出了以太网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准，如令牌环、FDDI和ARCNET。

电气电子工程师协会或IEEE（Institute of Electrical and Electronics Engineers）是一个国际性的电子技术与信息科学工程师的协会。

建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万。

专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志，学报，书籍和每年组织300多次专业会议。

IEEE定义的标准在工业界有极大的影响。

下面列出：IEEE802．3以太网标准802.3--------- 10Base以太网标准802.3u-------- 100Base-T（快速以太网）802.3z-------- 1000Base-X（光纤吉比特以太网）802.3ab-------- 1000Base-T（双绞线吉比特以太网）2、对于这样一个地址,192.168.19.255/20,下列说法正确的是: （）(A) 这是一个广播地址(B) 这是一个网络地址(C) 这是一个私有地址(D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上(F) 这是一个公有地址答案：CE注：IP地址中关键是看她的主机位，将子网掩码划为二进制，1对应上面的地址是网络位，0对应的地址是主机位192.168.19.255/20划为二进制为：11000000.10101000.00010011.1111111111111111.11111111.11110000.00000000主机位变成全0表示这个IP的网络地址主机槐涑扇?表示这个IP的广播地址RFC1918文件规定了保留作为局域网使用的私有地址：10.0.0.0 - 10.255.255.255 (10/8 prefix)172.16.0.0 - 172.31.255.255 (172.16/ 12 prefix)192.168.0.0 - 192.168.255.255 (192.168/16 prefix)3、Quidway系列路由器在执行数据包转发时，下列哪些项没有发生变化（假定没有使用地址转换技术）？（）(A) 源端口号(B) 目的端口号(C) 源网络地址(D) 目的网络地址(E) 源MAC地址(F) 目的MAC地址答案：ABCD参考知识点：路由功能就是指选择一条从源网络到目的网络的路径，并进行数据包的转发。

完整版CCNA测试题库及答案

完整版CCNA测试题库及答案描述载波侦听多路由访问/冲突检测（CSMA/CD）的工作原理。

CSMA/CD是一种帮助设备均衡共享带宽的协议，可避免两台设备同时在网络介质上传输数据。

虽然他不能消除冲突，但有助于极大的减少冲突，进而避免重传，从而提高所的设备的数据传输效率。

区分半双工和全双工通信。

并指出两种方法的需求。

与半双工以太网使用一对导线不同，全双工以太网使用两队导线，全双工使用不同的导线来消除冲突，从而允许同时发送和接收数据，而半双工可接收或发送数据，但不能同时接收和发送数据，且仍会出现冲突。

要使用全双工，电缆两端的设备都必须支持全双工，并配置成一全双模式运行。

描述MAC地址的组成部分以及各部分包含的信息。

MAC（硬件）地址时一种使用十六进制表示的地址，长48位（6B）。

其中前24位（3B）称为OUI（Organizationally Unique Idebtifier,组织唯一表示符），有IEEE分配给NIC制造商；余下的部分呢唯一地标识了NIC识别十进制数对应的二进制值和十六进制值。

用这三种格式之一表示的任何数字都可以转换为其他两种格式，能够执行这种转换对理解IP地址和子网划分至关重要。

识别以太网帧中与数据链路层相关的字段。

在以太网中，与数据链路层相关的字段包括前导码，帧其实位置分隔符，目标MAC地址，源MAC地址，长度或者类型以及帧校验序列。

识别以太网布线相关的IEEE标准。

这些标准描述了各种电缆类型的功能和物理特征，包括（但不限于）10Base2、10Base5和10BaseT。

区分以太网电缆类型及其用途。

以太网电缆分3种：直通电缆，用于将PC或路由器的以太网接口连接到集线器或交换机；交叉电缆。

用于将集线器连接到集线器，集线器连接到交换机，交换机连接到交换机以及PC连接到PC；反转电缆，用于PC和路由器或交换机之间建立控制台连接。

描述数据封装过程及其在分组创建中的作用。

数据封装指的是在OSI模型各层给数据添加信息的过程，也成为分组创建。

CCNA题库8

CCNA题库8（没有写answer的题目，淡蓝色的选项为答案）106. Refer to the exhibit.What does the (*) represent in the output?A. Packet is destined for a local interface to the router.B. Packet was translated, but no response was received from the distant device.C. Packet was not translated, because no additional ports are available.D. Packet was translated and fast switched to the destination.107. Refer to the exhibit.What command sequence will enable PAT from the inside to outside network?A. (config) ip nat pool isp-net 1.2.4.2 netmask 255.255.255.0 overloadB. (config-if) ip nat outside overloadC. (config) ip nat inside source list 1 interface ethernet1 overloadD. (config-if) ip nat inside overload108. Refer to the exhibit. What will happen to HTTP traffic coming from the Internet that is destined for172.16.12.10 if the traffic is processed by this ACL?A. Traffic will be dropped per line 30 of the ACL.B. Traffic will be accepted per line 40 of the ACL.C. Traffic will be dropped, because of the implicit deny all at the end of the ACL.D. Traffic will be accepted, because the source address is not covered by the ACL.109. What are three advantages of VLANs? (Choose three.)A. VLANs establish broadcast domains in switched networks.B. VLANs utilize packet filtering to enhance network security.C. VLANs provide a method of conserving IP addresses in large networks.D. VLANs provide a low-latency internetworking alternative to routed networks.E. VLANs allow access to network services based on department, not physical location.F. VLANs can greatly simplify adding, moving, or changing hosts on the network.110. An administrator would like to configure a switch over a virtual terminal connection from locations outside of the local LAN. Which of the following are required in order for the switch to be configured from a remote location? (Choose two.)A. The switch must be configured with an IP address, subnet mask, and default gateway.B. The switch must be connected to a router over a VLAN trunk.C. The switch must be reachable through a port connected to its management VLAN.D. The switch console port must be connected to the Ethernet LAN.E. The switch management VLAN must be created and have a membership of at least one switch port.F. The switch must be fully configured as an SNMP agent.111. Which of the following host addresses are members of networks that can be routed across the public Internet? (Choose three.)A. 10.172.13.65B. 172.16.223.125C. 172.64.12.29D. 192.168.23.252E. 198.234.12.95F. 212.193.48.254112. Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to network hosts? (Choose three.)A. 15.234.118.63B. 92.11.178.93C. 134.178.18.56D. 192.168.16.87E. 201.45.116.159F. 217.63.12.192113. Which of the following are benefits of VLANs? (Choose three.)A. They increase the size of collision domains.B. They allow logical grouping of users by function.C. They can enhance network security.D. They increase the size of broadcast domains while decreasing the number of collisiondomains.E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.F. They simplify switch administration.114. Which router IOS commands can be used to troubleshoot LAN connectivity problems? (Choose three.)A. pingB. tracertC. ipconfigD. show ip routeE. winipcfgF. show interfaces115. Which of the following are true regarding bridges and switches? (Choose two.)A. Bridges are faster than switches because they have fewer ports.B. A switch is a multiport bridge.C. Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.D. A bridgewill forward a broadcast but a switch will not.E. Bridges and switches increase the size of a collision domain.116. What are some of the advantages of using a router to segment the network? (Choose two.)A. Filtering can occur based on Layer 3 information.B. Broadcasts are eliminated.C. Routers generally cost less than switches.D. Broadcasts are not forwarded across the router.E. Adding a router to the network decreases latency.117. Which of the following statements are true regarding bridges and switches? (Choose3.)A. Switches are primarily software based while bridges are hardware based.B. Both bridges and switches forward Layer 2 broadcasts.C. Bridges are frequently faster than switches.D. Switches have a higher number of ports than most bridges.E. Bridges define broadcast domains while switches define collision domains.F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.118. Which characteristics are representative of a link-state routing protocol? (Choose three.)A. provides common view of entire topologyB. exchanges routing tables with neighborsC. calculates shortest pathD. utilizes event-triggered updatesE. utilizes frequent periodic updates119. Which of the following statements describe the network shown in the graphic? (Choose two.)A. There are two broadcast domains in the network.B. There are four broadcast domains in the network.C. There are six broadcast domains in the network.D. There are four collision domains in the network.E. There are five collision domains in the network.F. There are seven collision domains in the network.120. A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme? (Choose two.)A. 255.255.255.0B. 255.255.255.128C. 255.255.252.0D. 255.255.255.224E. 255.255.255.192F. 255.255.248.0。

CCNA题库V18总结

1. Refer to the exhibit. From RouterA, a network administrator is able to ping the serial interface of RouterB but unable to ping any of the subnets attached to RouterB. Base d on the partial outputs in the exhibit, what could be the problem?A. EIGRP does not support VLSM.B. The EIGRP network statements are incorrectly configured.C. The IP addressing on the serial interface of RouterA is incorrect.D. The routing protocol has summarized on the classful boundary.E. EIGRP has been configured with an invalid autonomous system number.Answer: D2. Refer to the exhibit. A junior network engineer has prepared the exhibited config uration file. What two statements are true of the planned configuration for interface fa0/1? (Choose two.)A. The two FastEthernet interfaces will require NAT configured on two outside serial interfaces.B. Address translation on fa0/1 is not required for DMZ Devices to access the Internet.C. The fa0/1 IP address overlaps with the space used by s0/0.D. The fa0/1 IP address is invalid for the IP subnet on which it resides.E. Internet hosts may not initiate connections to DMZ Devices through the configuration that is shown.Answer: BE3 Refer to the exhibit. The following commands are executed on interface fa0/1 of 2950Switch.2950Switch(config-if)# switchport port-security2950Switch(config-if)# switchport port-security mac-address sticky2950Switch(config-if)# switchport port-security maximum 1The Ethernet frame that is shown arrives on interface fa0/1. What two functions wil l occur when this frame is received by 2950Switch? (Choose two.)A. The MAC address table will now have an additional entry of fa0/1 FFFF.FFFF.FFFF.B. Only host A will be allowed to transmit frames on fa0/1.C. This frame will be discarded when it is received by 2950Switch.D. All frames arriving on 2950Switch with a destination of 0000.00aa.aaaa will be forwarded out fa0/1.E. Hosts B and C may forward frames out fa0/1 but frames arriving from other switches will not be forwarded out fa0/1.F. Only frames from source 0000.00bb.bbbb, the first learned MAC address of2950Switch, will be forwarded out fa0/1.Answer: BD4. Refer to the exhibit. What will Router1 do when it receives the data frame show n? (Choose three.)A. Router1 will strip off the source MAC address and replace it with the MAC address0000.0c36.6965.B. Router1 will strip off the source IP address and replace it with the IP address192.168.40.1.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.Answer: ACF5. A router has been configured to provide the nine users on the branch office LA N with Internet access,as shown in the diagram. It is found that some of the users on the LAN cannot reach the Internet. Based on the topology and router output s hown, which command should be issued on the router to correct the problem?A: Branch(config-if)# no shutdownB: Branch(config-if)# duplex fullC: Branch(config-if)# no keepaliveD: Branch(config-if)# ip address 192.168.10.30 255.255.255.240E: Branch(config-if)# bandwidth 100F: Branch(config-if)# encapsulation 802.3Answer: D6. Refer to the exhibit. When the hosts boot, hosts that are connected to the switc hes are having trouble getting a DHCP address from the DHCP server. Which ST P feature could minimize the effects of STP convergence for the hosts?A: port priorityB: PortFastC: BIDD: path costE: hold-down timerAnswer: B7. Refer to the exhibit. The partial frame in the graphic represents select header in formation within a frame arriving at a destination host. What can be determined fro m this information?A: The source host is a Telnet server.B: This frame contains the first segment in a Telnet session.C: The Layer 2 address of the source host is 192.168.14.2.D: The local host has received 42,335 bytes from the remote host as a part of this conversation.Answer: B8. A network administrator wants to control which user hosts can access the netwo rk based on their MAC address.What will prevent workstations with unauthorized M AC addresses from connecting to the network through a switch?A: BPDUB: port securityC: RSTPD: STPE: VTPF: blocking modeAnswer: B9. Refer to the exhibit. Workstation A must be able to telnet to switch SW-A through router RTA for management purposes. What must be configured for this connection to be successful?A: VLAN 1 on RTAB: default gateway on SW-AC: IP routing on SW-AD: cross-over cable connecting SW-A and RTAAnswer: B10. Which function does the Frame Relay DLCI provide with respect to RouterA?A: defines the signaling standard between RouterA and the frame switchB: identifies the circuit between RouterA and the frame switchC: identifies the circuit between RouterB and the frame switchD: identifies the encapsulation used between RouterA and RouterBE: defines the signaling standard between RouterB and the frame switchAnswer: B11. Refer to the exhibit. Given the partial configuration shown in the exhibit, why d o internal workstations on the 192.168.1.0 network fail to access the Internet?A: A NAT pool has not been defined.B: The wrong interface is overloaded.C: NAT has not been applied to the inside and outside interfaces.D: The access list has not been applied to the proper interface to allow traffic out of the internal network.Answer: C12. In a Frame Relay environment, what is the function of the DE bit?A: the activation of the LMI protocolB: the identification of the virtual circuitC: the identification of what routing updates to blockD: the identification of frames that are transmitted above the CIRE: the notification to the destination switch of network congestionAnswer: D13. The access control list shown in the graphic has been applied to the Ethernet interface of router R1 using the ip access-group 101 in command. Which of the fol lowing Telnet sessions will be blocked by this ACL? (Choose two.)A: from host A to host 5.1.1.10B: from host A to host 5.1.3.10C: from host B to host 5.1.2.10D: from host B to host 5.1.3.8E: from host C to host 5.1.3.10F: from host F to host 5.1.1.10Answer: BD14. A network administrator is designing a new corporate internetwork. The corporation is concerned aboutdowntime due to link failure and also about link costs. Which topology will provide some redundancy toincrease reliability for all sites but will cost less than a fully redundant topology?Answer: B15. You have finished physically installing an access point on the ceiling at your of fice. At a minimum, which parameter must be configured on the access point in or der to allow a wireless client to operate on it?A: AESB: PSKC: SSIDD: TKIPE: WEPAnswer: C16. What does a Layer 2 switch use to decide where to forward a received frame?A: source MAC addressB: source IP addressC: source switch portD: destination IP addressE: destination port addressF: destination MAC addressAnswer: F17. The exhibited network is stable and operating properly. Assuming that default STP configurations are running on both switches, which port will be in blocking mo de?A: Port Fa0/1 on Switch1B: Port Fa0/2 on Switch1C: Port Fa0/1 on Switch2D: Port Fa0/2 on Switch2Answer: A18. What Frame Relay mechanism is used to build the map illustrated in the accompanying graphic?A: ARPB: Inverse ARPC: inverse multiplexingD: LMI mappingE: proxy ARPAnswer: B19. The system LED is amber on a Cisco Catalyst 2950 series switch. What does this indicate?A: The system is malfunctioning.B: The system is not powered up.C: The system is powered up and operational.D: The system is forwarding traffic.E: The system is sensing excessive collisions.Answer: A20. Refer to the exhibit. The network administrator is configuring RTA to connect t o a non-Cisco network. Which two commands would be applied to the S0/0 WAN i nterface, but not to the Fa0/0 LAN interface?(Choose two.)A:speedB:no shutdownC:ip addressD:authentication papE:encapsulation pppAnswer: DE21. Which two of these are characteristics of the 802.1Q protocol? (Choose two.)A:It is used exclusively for tagging VLAN frames and does not address network reconvergence followingswitched network topology changes.B:It modifies the 802.3 frame header, and thus requires that the FCS be recomputed. C:It is a Layer 2 messaging protocol which maintains VLAN configurations across networks.D:It includes an 8-bit field which specifies the priority of a frame.E:It is a trunking protocol capable of carrying untagged frames.Answer: BE22. The network administrator has configured NAT as shown in the graphic. Some clients can access the Internet while others cannot. What should the network adm inistrator do to resolve this problem?A: Configure an IP NAT pool.B: Properly configure the ACL.C: Apply the ACL to the S0 interface.D: Configure another interface with the ip nat outside command.Answer: B23. Refer to the exhibit. When running OSPF, what would cause router A not to form an adjacency with router B?A: The loopback addresses are on different subnets.B: The values of the dead timers on the routers are different.C: Route summarization is enabled on both routers.D: The process identifier on router A is different than the process identifier on router B. Answer: B24. Which two methods are examples of implementing Layer 2 security on a Cisco switch? (Choose two.)A:disable trunk negotiation on the switchB:enable Cisco Discovery Protocol globally to monitor for malicious devicesC:configure a switch port host where appropriateD:enable HTTP access to the switch for security troubleshootingE:use only protected Telnet sessions to connect to the Cisco deviceF:install a modem on the auxiliary port for emergency accessAnswer: AC25. How is an EUI-64 format interface ID created from a 48-bit MAC address?A: by appending 0xFF to the MAC addressB: by prefixing the MAC address with 0xFFEEC: by prefixing the MAC address with 0xFF and appending 0xFF to itD: by inserting 0xFFFE between the upper three bytes and the lower three bytes of the MAC addressE: by prefixing the MAC address with 0xF and inserting 0xF after each of its first three bytesAnswer: D。

CCNA试题

CCNA认证试题一（附答案和解析）中文版(一)CCNA1 2007-09-30 15:49:59 阅读139 评论0 字号：大中小订阅1、目前，我国应用最为广泛的LAN标准是基于（）的以太网标准.(A) IEEE 802.1(B) IEEE 802.2(C) IEEE 802.3(D) IEEE 802.5答案：C参考知识点：现有标准：IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802.3 以太网IEEE 802.4 令牌总线IEEE 802.5 令牌环IEEE 802.8 FDDIIEEE 802.11 无线局域网记住IEEE802.1-------IEEE802.5的定义以太网是一种计算机局域网组网技术。

IEEE制定的IEEE 802.3标准给出了以太网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准，如令牌环、FDDI和ARCNET。

电气电子工程师协会或IEEE（Institute of Electrical and Electronics Engineers）是一个国际性的电子技术与信息科学工程师的协会。

建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万。

专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志，学报，书籍和每年组织300多次专业会议。

IEEE 定义的标准在工业界有极大的影响。

下面列出：IEEE802．3以太网标准802.3--------- 10Base以太网标准802.3u-------- 100Base-T（快速以太网）802.3z-------- 1000Base-X（光纤吉比特以太网）802.3ab-------- 1000Base-T（双绞线吉比特以太网）2、对于这样一个地址,192.168.19.255/20,下列说法正确的是: （）(A) 这是一个广播地址(B) 这是一个网络地址(C) 这是一个私有地址(D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上(F) 这是一个公有地址答案：CE注：IP地址中关键是看她的主机位，将子网掩码划为二进制，1对应上面的地址是网络位，0对应的地址是主机位192.168.19.255/20划为二进制为：11000000.10101000.00010011.1111111111111111.11111111.11110000.00000000主机位变成全0表示这个IP的网络地址主机槐涑扇?表示这个IP的广播地址RFC1918文件规定了保留作为局域网使用的私有地址：10.0.0.0 - 10.255.255.255 (10/8 prefix)172.16.0.0 - 172.31.255.255 (172.16/12 prefix)192.168.0.0 - 192.168.255.255 (192.168/16 prefix)3、Quidway系列路由器在执行数据包转发时，下列哪些项没有发生变化（假定没有使用地址转换技术）？（）(A) 源端口号(B) 目的端口号(C) 源网络地址(D) 目的网络地址(E) 源MAC地址(F) 目的MAC地址答案：ABCD参考知识点：路由功能就是指选择一条从源网络到目的网络的路径，并进行数据包的转发。

CCNA认证精彩试题中文+问题详解

IEEE制定的IEEE 802.3标准给出了以太网的技术标准。

它规定了包括物理层的连线、电信号和介质访问层协议的内容。

以太网是当前应用最普遍的局域网技术。

它很大程度上取代了其他局域网标准，如令牌环、FDDI和ARCNET。

电气电子工程师协会或IEEE（Institute of Electrical and Electronics Engineers）是一个国际性的电子技术与信息科学工程师的协会。

建会于1963年1月1日。

总部在美国纽约市。

在150多个国家中它拥有300多个地方分会。

目前会员数是36万。

专业上它有35个专业学会和两个联合会。

IEEE发表多种杂志，学报，书籍和每年组织300多次专业会议。

IEEE 定义的标准在工业界有极大的影响。

下面列出：IEEE802．3以太网标准802.3--------- 10Base以太网标准802.3u-------- 100Base-T（快速以太网）802.3z-------- 1000Base-X（光纤吉比特以太网）802.3ab-------- 1000Base-T（双绞线吉比特以太网）2、对于这样一个地址,192.168.19.255/20,下列说法正确的是: （）(A) 这是一个广播地址(B) 这是一个网络地址(C) 这是一个私有地址(D) 地址在192.168.19.0网段上(E) 地址在192.168.16.0网段上(F) 这是一个公有地址答案：CE注：IP地址中关键是看她的主机位，将子网掩码划为二进制，1对应上面的地址是网络位，0对应的地址是主机位192.168.19.255/20划为二进制为：11000000.10101000.00010011.1111111111111111.11111111.11110000.00000000主机位变成全0表示这个IP的网络地址主机槐涑扇?表示这个IP的广播地址RFC1918文件规定了保留作为局域网使用的私有地址：10.0.0.0 - 10.255.255.255 (10/8 prefix)172.16.0.0 - 172.31.255.255 (172.16/12 prefix)192.168.0.0 - 192.168.255.255 (192.168/16 prefix)3、Quidway系列路由器在执行数据包转发时，下列哪些项没有发生变化（假定没有使用地址转换技术）？（）(A) 源端口号(B) 目的端口号(C) 源网络地址(D) 目的网络地址(E) 源MAC地址(F) 目的MAC地址答案：ABCD参考知识点：路由功能就是指选择一条从源网络到目的网络的路径，并进行数据包的转发。

2023年CCNA考试真题

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

下面是本次考试的真题，希望能够帮助考生更好地复习。

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

2. 在TCP/IP协议族中，位于传输层的协议是_________。

3. IP地址由_________位二进制数组成。

新10月CCNA题库word版1~100题共24页

QUESTION 1When you are logged into a switch, which prompt indicates that you are in privileged mode?A. %B. @C. >D. $E. #QUESTION 2Which command shows system hardware and software version information?A. show configurationB. show environmentC. show inventoryD. show platformE. show versionQUESTION 3Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An 802. 1Qtrunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 thenative VLAN is not specified.What will happen in this scenario?A. 802.1Q giants frames could saturate the link.B. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.C. A native VLAN mismatch error message will appear.D. VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.QUESTION 4Which command would correctly configure a serial port on a router with the last usable host address in the192.216.32.32/29 subnet?A. Router(config-if)# ip address 192.216.32.38 255.255.255.240B. Router(config-if)# ip address 192.216.32.39 255.255.255.224C. Router(config-if)# ip address 192.216.32.63 255.255.255.248D. Router(config-if)# ip address 192.216.32.39 255.255.255.248E. Router(config-if)# ip address 192.216.32.63 255.255.255.248F. Router(config-if)# ip address 192.216.32.38 255.255.255.248QUESTION 5The network default gateway applying to a host by DHCP is 192.168.5.33/28. Which option is the valid IPaddress of this host?A. 192.168.5.55B. 192.168.5.47C. 192.168.5.40D. 192.168.5.32E. 192.168.5.14QUESTION 6Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0? (Choose two.)A. 113.10.4.0B. 186.54.3.0C. 175.33.3.255D. 26.35.2.255E. 17.35.36.0QUESTION 7The network administrator has asked you to check the status of the workstation's IP stack by pinging theloopback address. Which address would you ping to perform this task?A. 10.1.1.1B. 127.0.0.1C. 192.168.0.1D. 239.1.1.1QUESTION 8Workstation A has been assigned an IP address of 192.0.2.24/28. Workstation B has been assigned an IPaddress of 192.0.2.100/28. The two workstations are connected with a straight-through cable. Attempts toping between the hosts are unsuccessful. What two things can be done to allow communications betweenthe hosts? (Choose two.)A. Replace the straight-through cable with a crossover cable.B. Change the subnet mask of the hosts to /25.C. Change the subnet mask of the hosts to /26.D. Change the address of Workstation A to 192.0.2.15.E. Change the address of Workstation B to 192.0.2.111.QUESTION 9Your ISP has given you the address 223.5.14.6/29 to assign to your router's interface. They have alsogiven you the default gateway address of 223.5.14.7. After you have configured the address, the router isunable to ping any remote devices. What is preventing the router from pinging remote devices?A. The default gateway is not an address on this subnet.B. The default gateway is the broadcast address for this subnet.C. The IP address is the broadcast address for this subnet.D. The IP address is an invalid class D multicast address.QUESTION 10Which command is used to copy the configuration from RAM into NVRAM?A. copy running-config startup-configB. copy startup-config: running-config:C. copy running config startup configD. copy startup config running configE. write terminalQUESTION 11Which command is used to load a configuration from a TFTP server and merge the configuration intoRAM?A. copy running-config: TFTP:B. copy TFTP: running-configC. copy TFTP: startup-configD. copy startup-config: TFTP:QUESTION 12A system administrator types the command to change the hostname of a router. Where on the Cisco IFS isthat change stored?A. NVRAMB. RAMC. FLASHD. ROME. PCMCIAQUESTION 13Which command is used to configure a default route?A. ip route 172.16.1.0 255.255.255.0 0.0.0.0B. ip route 172.16.1.0 255.255.255.0 172.16.2.1C. ip route 0.0.0.0 255.255.255.0 172.16.2.1D. ip route 0.0.0.0 0.0.0.0 172.16.2.1QUESTION 14If IP routing is enabled, which two commands set the gateway of last resort to the default gateway?(Choose two.)A. ip default-gateway 0.0.0.0B. ip route 172.16.2.1 0.0.0.0 0.0.0.0C. ip default-network 0.0.0.0D. ip default-route 0.0.0.0 0.0.0.0 172.16.2.1E. ip route 0.0.0.0 0.0.0.0 172.16.2.1QUESTION 15Which command would you configure globally on a Cisco router that would allow you to view directlyconnected Cisco devices?A. enable cdpB. cdp enableC. cdp runD. run cdpQUESTION 16Which command is used to see the path taken by packets across an IP network?A. show ip routeB. show routeC. tracerouteD. trace ip routeQUESTION 17Which command is used to debug a ping command?A. debug icmpB. debug ip icmpC. debug tcpD. debug packetQUESTION 18Which command displays CPU utilization?A. show protocolsB. show processC. show systemD. show versionQUESTION 19When configuring a serial interface on a router, what is the default encapsulation?A. atm-dxiB. frame-relayC. hdlcD. lapbE. pppQUESTION 20What must be set correctly when configuring a serial interface so that higher-level protocols calculate thebest route?A. bandwidthB. delayC. loadD. reliabilityQUESTION 21A company implements video conferencing over IP on their Ethernet LAN. The users notice that thenetwork slows down, and the video either stutters or fails completely. What is the most likely reason forthis?A. minimum cell rate (MCR)B. quality of service (QoS)C. modulationD. packet switching exchange (PSE)E. reliable transport protocol (RTP)QUESTION 22Which layer in the OSI reference model is responsible for determining the availability of the receivingprogram and checking to see if enough resources exist for that communication?A. transportB. networkC. presentationD. sessionE. applicationQUESTION 23Data transfer is slow between the source and destination. The quality of service requested by the transportlayer in the OSI reference model is not being maintained. To fix this issue, at which layer should thetroubleshooting process begin?A. presentationB. sessionC. transportD. networkE. physicalQUESTION 24Which protocols are found in the network layer of the OSI reference model and are responsible for pathdetermination and traffic switching?A. LANB. routingC. WAND. networkQUESTION 25Which command reveals the last method used to powercycle a router?A. show reloadB. show bootC. show running-configD. show versionQUESTION 26Which three options are valid WAN connectivity methods? (Choose three.)A. PPPB. WAPC. HDLCD. MPLSE. L2TPv3CCNA考试报名1700元7F. ATMQUESTION 27Refer to the exhibit. Which WAN protocol is being used?A. ATMB. HDLCC. Frame RelayD. PPPQUESTION 28What is the difference between a CSU/DSU and a modem?A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signalsfrom a router to a leased line.B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signalsfrom a router to a leased line.C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signalsfrom a router to a phone line.D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signalsfrom a router to a phone line.QUESTION 29A network administrator must configure 200 switch ports to accept traffic from only the currently attachedCCNA考试报名1700元8host devices. What would be the most efficient way to configure MAC-level security on all these ports?A. Visually verify the MAC addresses and then telnet to the switches to enter the switchport-port securitymac-address command.B. Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port securitymac-address command.C. Use the switchport port-security MAC address sticky command on all the switch ports that have enddevices connected to them.D. Use show mac-address-table to determine the addresses that are associated with each portand thenenter the commands on each switch for MAC address port-security.QUESTION 30When troubleshooting a Frame Relay connection, what is the first step when performing a loopback test?A. Set the encapsulation of the interface to HDLC.B. Place the CSU/DSU in local-loop mode.C. Enable local-loop mode on the DCE Frame Relay router.D. Verify that the encapsulation is set to Frame Relay.What occurs on a Frame Relay network when the CIR is exceeded?A. All TCP traffic is marked discard eligible.B. All UDP traffic is marked discard eligible and a BECN is sent.C. All TCP traffic is marked discard eligible and a BECN is sent.D. All traffic exceeding the CIR is marked discard eligible.QUESTION 32What are two characteristics of Frame Relay point-to-point subinterfaces? (Choose two.)A. They create split-horizon issues.B. They require a unique subnet within a routing domain.C. They emulate leased lines.D. They are ideal for full-mesh topologies.E. They require the use of NBMA options when using OSPF.QUESTION 33Refer to the exhibit. Addresses within the range 10.10.10.0/24 are not being translated to the 1.128.0/16range. Which command shows if 10.10.10.0/24 are allowed inside addresses?A. debug ip natB. show access-listC. show ip nat translationD. show ip nat statisticsQUESTION 34A wireless client cannot connect to an 802.11b/g BSS with a b/g wireless card. The client section of theaccess point does not list any active WLAN clients. What is a possible reason for this?A. The incorrect channel is configured on the client.B. The client's IP address is on the wrong subnet.C. The client has an incorrect pre-shared key.D. The SSID is configured incorrectly on the client.QUESTION 35Which two features did WPAv1 add to address the inherent weaknesses found in WEP? (Choose two.)CCNA考试报名1700元10艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyA. a stronger encryption algorithmB. key mixing using temporal keysC. shared key authenticationD. a shorter initialization vectorE. per frame sequence countersQUESTION 36Which two wireless encryption methods are based on the RC4 encryption algorithm? (Choose two.)A. WEPB. CCKMC. AESD. TKIPE. CCMPQUESTION 37What are two characteristics of RIPv2? (Choose two.)A. classful routing protocolB. variable-length subnet masksC. broadcast addressingD. manual route summarizationE. uses SPF algorithm to compute pathQUESTION 38Which two Ethernet fiber-optic modes support distances of greater than 550 meters?A. 1000BASE-CXCCNA考试报名1700元11艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyB. 100BASE-FXC. 1000BASE-LXD. 1000BASE-SXE. 1000BASE-ZXQUESTION 39What two things will a router do when running a distance vector routing protocol? (Choose two.)A. Send periodic updates regardless of topology changes.B. Send entire routing table to all routers in the routing domain.C. Use the shortest-path algorithm to the determine best path.D. Update the routing table based on updates from their neighbors.E. Maintain the topology of the entire network in its database.QUESTION 40Refer to the exhibit. According to the routing table, where will the router send a packet destined for10.1.5.65?A. 10.1.1.2B. 10.1.2.2C. 10.1.3.3D. 10.1.4.4QUESTION 41Which command shows if an access list is assigned to an interface?A. show ip interface [interface] access-listsB. show ip access-lists interface [interface]C. show ip interface [interface]D. show ip access-lists [interface]QUESTION 42Refer to the exhibit. Which rule does the DHCP server use when there is an IP address conflict?A. The address is removed from the pool until the conflict is resolved.B. The address remains in the pool until the conflict is resolved.C. Only the IP detected by Gratuitous ARP is removed from the pool.D. Only the IP detected by Ping is removed from the pool.E. The IP will be shown, even after the conflict is resolved.QUESTION 43Refer to the exhibit. You are connected to the router as user Mike. Which command allows you to seeoutput from the OSPF debug command?A. terminal monitorB. show debuggingC. show sessionsD. show ip ospf interfaceQUESTION 44Refer to the exhibit. If number 2 is selected from the setup script, what happens when the user runs setupfrom a privileged prompt?A. Setup is additive and any changes will be added to the config script.B. Setup effectively starts the configuration over as if the router was booted for the first time.C. Setup will not run if an enable secret password exists on the router.D. Setup will not run, because it is only viable when no configuration exists on the router. QUESTION 45Refer to the exhibit. Which (config-router) command will allow the network represented on the interface tobe advertised by RIP?A. redistribute ethernet0B. network ethernet0CCNA考试报名1700元14艾迪飞论坛http://bbs.edify艾迪飞论坛http://bbs.edifyC. redistribute 10.12.0.0D. network 10.12.0.0QUESTION 46Refer to the exhibit. What information can be gathered from the output?A. One router is running RIPv1.B. RIP neighbor is 224.0.0.9.C. The network contains a loop.D. Network 10.10.1.0 is reachable.QUESTION 47Refer to the exhibit. What type of connection would be supported by the cable diagram shown?A. PC to routerB. PC to switchC. server to routerD. router to routerQUESTION 48Refer to the exhibit. What type of connection would be supported by the cable diagram shown?A. PC to routerB. PC to switchC. server to switchD. switch to routerQUESTION 49Which two statements describe the Cisco implementation of VLANs? (Choose two.)A. VLAN 1 is the default Ethernet VLAN.B. CDP advertisements are only sent on VLAN 1002.C. By default, the management VLAN is VLAN 1005.D. By default, the switch IP address is in VLAN 1005.E. VLAN 1002 through 1005 are automatically created and cannot be deleted.QUESTION 50Refer to the exhibit. What can be determined about the router from the console output?A. No configuration file was found in NVRAM.B. No configuration file was found in flash.C. No configuration file was found in the PCMCIA card.D. Configuration file is normal and will load in 15 seconds.QUESTION 52Refer to the exhibit. Which command would allow the translations to be created on the router?A. ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 19B. ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 19C. ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 18D. ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 18QUESTION 53Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output asshown. At which OSI layer is the problem?A. data link layerB. application layerC. access layerD. session layerE. network layerQUESTION 54Refer to the exhibit. Which value will be configured for Default Gateway of the Local Area Connection?A. 10.0.0.0B. 10.0.0.254C. 192.223.129.0D. 192.223.129.254QUESTION 55Refer to the exhibit. The user at Workstation B reports that Server A cannot be reached. What is preventing Workstation B from reaching Server A?A. The IP address for Server A is a broadcast address.B. The IP address for Workstation B is a subnet address.C. The gateway for Workstation B is not on the same subnet.D. The gateway for Server A is not on the same subnet.QUESTION 56Refer to the exhibit. What does the (*) represent in the output?A. Packet is destined for a local interface to the router.B. Packet was translated, but no response was received from the distant device.C. Packet was not translated, because no additional ports are available.D. Packet was translated and fast switched to the destination.QUESTION 57Refer to the exhibit. What command sequence will enable PAT from the inside to outside network?A. (config) ip nat pool isp-net 1.2.4.2 netmask 255.255.255.0 overloadB. (config-if) ip nat outside overloadC. (config) ip nat inside source list 1 interface ethernet1 overloadD. (config-if) ip nat inside overloadQUESTION 58Refer to the exhibit. What will happen to HTTP traffic coming from the Internet that is destined for172.16.12.10 if the traffic is processed by this ACL?A. Traffic will be dropped per line 30 of the ACL.B. Traffic will be accepted per line 40 of the ACL.C. Traffic will be dropped, because of the implicit deny all at the end of the ACL.D. Traffic will be accepted, because the source address is not covered by the ACL.QUESTION 59Refer to the exhibit. Which statement describes the effect that the Router1 configuration has on devices inthe 172.16.16.0 subnet when they try to connect to SVR-A using Telnet or SSH?A. Devices will not be able to use Telnet or SSH.B. Devices will be able to use SSH, but not Telnet.C. Devices will be able to use Telnet, but not SSH.D. Devices will be able to use Telnet and SSH.QUESTION 60What are three advantages of VLANs? (Choose three.)A. VLANs establish broadcast domains in switched networks.B. VLANs utilize packet filtering to enhance network security.C. VLANs provide a method of conserving IP addresses in large networks.D. VLANs provide a low-latency internetworking alternative to routed networks.E. VLANs allow access to network services based on department, not physical location.F. VLANs can greatly simplify adding, moving, or changing hosts on the network.QUESTION 61An administrator would like to configure a switch over a virtual terminal connection from locations outsideof the local LAN. Which of the following are required in order for the switch to be configured from a remotelocation? (Choose two.)A. The switch must be configured with an IP address, subnet mask, and default gateway.B. The switch must be connected to a router over a VLAN trunk.C. The switch must be reachable through a port connected to its management VLAN.D. The switch console port must be connected to the Ethernet LAN.E. The switch management VLAN must be created and have a membership of at least one switch port.F. The switch must be fully configured as an SNMP agent.QUESTION 62Which of the following host addresses are members of networks that can be routed across the publicInternet? (Choose three.)A. 10.172.13.65B. 172.16.223.125C. 172.64.12.29D. 192.168.23.252E. 198.234.12.95F. 212.193.48.254QUESTION 63Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to networkhosts? (Choose three.)A. 15.234.118.63B. 92.11.178.93C. 134.178.18.56D. 192.168.16.87E. 201.45.116.159F. 217.63.12.192QUESTION 64Which of the following are benefits of VLANs? (Choose three.)A. They increase the size of collision domains.B. They allow logical grouping of users by function.C. They can enhance network security.D. They increase the size of broadcast domains while decreasing the number of collision domains.E. They increase the number of broadcast domains while decreasing the size of the broadcast domains.F. They simplify switch administration.Which router IOS commands can be used to troubleshoot LAN connectivity problems? (Choose three.)A. pingB. tracertC. ipconfigD. show ip routeE. winipcfgF. show interfacesQUESTION 67。

CCNA考试题

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

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

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

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

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

CCNA第一学期各章习题和参考答案.doc

CCNA第一学期各章习题和参考答案第二章网络通信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E将数据段划分为数据包2、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）B发起数据通信D发送数据流F数据流最后的终止点3、下列哪三项陈述是对局域网(LAN) 最准确的描述？（选择三项）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。

F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？A传输期间的帧损坏B在目的设备上重组的数据C因通信丢失而重新传输的数据包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）018哪个应用层协议通常用于支持客户端与服务器之间的文件传输？A HTMLB HTTP D Telnet019哪个应用层协议中规定了Microsoft 网络中用于文件共享的服务？A DHCPB DNS D SMTP E Telnet020服务器上的应用层通常如何处理多客户端服务请求？A终止与服务的所有连接B拒绝与单一守护程序的多个连接C暂停当前连接，建立新连接第四章OSI传输层001下列哪两项是用户数据报协议(UDP) 的功能？（选择两项）A流量控制 D 面向连接E 序列和确认002请参见图示。

此Wireshark 捕获输出的第7 行中执行的是哪一项TCP 操作？A会话创建B 数据段重传C 数据传输D 会话断开003数据段的TCP 报头中为什么包含端口号？A指示转发数据段时应使用的正确路由器接口B 标识接收或转发数据段时应使用的交换机端口C确定封装数据时应使用的第3 层协议让接收主机转发数据到适当的应用程序E让接收主机以正确的顺序组装数据包004OSI 模型哪一层负责规范信息从源设备到目的设备准确可靠地流动？A应用层 B 表示层 C 会话层传输层 E 网络层005请参见图示。

ccna1_test

第一学期章节测试================================================================= 111111 第一章测试 111111 =================================================================1.哪个计算机组件是计算机系统的神经中枢，并且负责处理机器中的所有数据？RAMCPU显卡声卡操作系统2 points for Option 22.购买预先组装好的计算机有哪两项优点？（选择两项。

）成本通常比较低可以精确指定组件组装的等待期更长足以执行大多数一般的应用程序适合有特殊需求的客户Option 1 and Option 4 are correct.3.某用户计划在一台计算机上同时运行多个应用程序。

哪个计算机组件是完成此任务的关键？RAMNIC显卡声卡存储设备2 points for Option 14.哪个适配卡可让计算机系统与本地网络中的其它系统交换信息？调制解调器卡控制器卡显卡声卡网卡2 points for Option 55.服务器、台式计算机、便携式计算机使用的主要存储设备是什么？磁带驱动器硬盘光盘驱动器 (DVD)软盘驱动器2 points for Option 26.哪个组件用于消除来自电源线的高压尖峰，使其不损坏计算机系统？CPU电涌抑制器主板硬盘2 points for Option 27.下列哪两项属于输出外围设备？（选择两项。

）打印机扬声器闪存驱动器外部 DVD外部调制解调器Option 1 and Option 2 are correct.8.UPS 可以提供哪两项浪涌保护器所不具备的功能？（选择两项。

）保护计算机不受电压浪涌的损坏用内部电池提供备用电源保护计算机不受突然电压尖峰的损坏让用户有时间给电力公司打电话在电源出现故障时，为用户提供安全关机的时间通过墙上插座供电的发电机提供备用电源Option 2 and Option 5 are correct.9.何为字处理程序？它是计算机的一个物理组件。

最新CCNA认证考试真题

最新CCNA认证考试真题小编为大家收集整理了《最新CCNA认证考试真题》供大家参考，希望对大家有所帮助！！！（1）TCP/IP Addressing and Protocol1: Your junior network administrator wants to know what the default subnet mask is for a Class C IP address. What do you tell him?A. 255.0.0.0B. 255.255.0.0C. 255.245.255.0D. 255.255.255.0E. 255.255.255.255 2: An application needs to have reliable, end-to-end connect-ivity. Which of the following protocols will give you reliable connectivity?A. TCPB. UDPC. IPD. ICMP 3: You are designing a network, which needs to support 55 users. You don't plan to extend the segment beyond the current number of users. Which subnet mask would best meet your needs?A. 255.255.0.0B. 255.255.255.0C. 255.255.255.192D. 255.255.255.160 4: You have added a new switch to your network. You want to manage it remotely, so you need to assign it an IP address. Your router that connects to the switch has an IP address of 172.16.12.33/27. Which of the following addresses can you assign to this switch?A. 172.16.12.33/28B. 172.16.12.32/27C. 172.16.12.33/27D. 172.16.12.34/27E. 172.16.12.35/28F. 172.16.12.38/28G. 172.16.12.63/27 5: The address 172.16.208.16/20 is a host address in which of the following subnets? A.172.16.176.0–255.255.240.0B. 172.16.192.0–255.255.240.0C. 172.16.208.0–255.255.240.0D. 172.16.224.0–255.255.240.0 6: You are designing an IP address scheme for your brand new remote office. The vice president of IT calls to tell you that you will be in charge of the 192.168.1.64/26 subnetwork. This supplies you with a single subnetwork with 62 hosts. You need to have at least two subnets with 14 hosts in each subnet. What custom subnet mask should you use?A. 255.255.255.128B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.248 7: You have subnetted the 210.106.14.0 network with a /24 mask. Your boss at Acme, Inc. wants toknow how many usable subnetworks and usable host addresses per subnet this would provide. What should you tell her?A. One network with 254 hostsB. Two networks with 128 hostsC. Four networks with 64 hostsD. Six networks with 30 hosts 8: Identify three valid host addresses in any subnet of the 201.168.27.0 network, assuming a fixed subnet mask of 255.255.255.240. (Choose three.)A. 201.168.27.33B. 201.168.27.112C. 201.168.27.119D. 201.168.27.126E. 201.168.27.175F. 201.168.27.208 9: What is the subnetwork address for a host with the IP address 201.100.5.68/28?A. 201.100.5.0B. 201.100.5.32C. 201.100.5.64D. 201.100.5.65E. 201.100.5.31F. 201.100.5.1 10: Which of the following protocols uses a three-way handshake mechanism to establish sessions?A. TCPB. IPC. UDPD. IPXE. Frame relay 11: Which of the following protocols is connection-oriented? A. TCPB. IPC. IPXD. Frame relay 12: You are using an application on your Windows 2000 client machines that provides errorcorrection. You need a protocol to provide fast transport. Which protocol should your application use?A. TCPB. IPC. UDPD. SPXE. AppleTalk 13: When using TCP, after a session is open, the applications can adjust the number of segments they receive before sending an acknowledgment. This behavior is known as ______________.A. MTU adjustmentB. WindowingC. Flexible Send PathD. FCS 14: If the destination did not receive a segment, how will the TCP host know to resend the information?A. The ACK received will not include the segment number that was not received.B. The ACK received will include the segment number that was not received.C. The sending host will send a PACK to verify segment receipt.D. The destination host will send a YACK message back to the sending host. 15: You are planning on using a single network that supports 208 users. Which IP address class would you choose to be the most efficient?A. Class AB. Class BC. Class CD. Class DE. Class E 16: RFC 1918 defines the private IP address ranges. Which of the following IP addresses are considered part of these ranges? (Choose three.)A. 10.23.45.67B. 126.21.34.56C. 172.16.32.1D. 172.31.234.55E. 192.169.4.5 17: A new network is being designed for your company, Acme, Inc. If you use a Class C IP network, which subnet mask will provide one usable subnet per department while allowing enough usable host addresses for each department specified in the table?Department Number of Users Corporate 7 Customer Support 15 Financial 13 HR 7 Engineering 16 A. 255.255.255.0B. 255.255.255.192C. 255.255.255.224D. 255.255.255.240E. 255.255.255.248 18: Which of these protocols provides data transport, relying on the error correctioncapabilities of the application itself?A. UDPB. TCPC. SNMPD. ICMP 19: Which of the following are used by TCP to ensure reliable delivery of data? (Choose two.)A. MAC address resolutionB. Sequence numbersC. AcknowledgmentsD. PingE. Routing updates 20: You discover that you are able to adjust the window size of the TCP segment. You increase the window size to test the results. What will you observe happening on your network?A. Increased throughputB. Decreased throughputC. Increased latencyD. Decreased reliability21: Your organization is using the 192.168.1.0/24 address space. You need 28 subnets. What subnet mask would you use to create these subnets?A. 255.255.255.0B. 255.255.255.128C. 255.255.255.192D. 255.255.255.224E. 255.255.255.240F. 255.255.255.248 22: Which of the following protocols maps IP addresses to MAC addresses for connectivity to occur between two hosts?A. ARPB. RARPC. SLARPD. DHCP 23: Your junior network administrator cannot seem to ping a host in another network and asks you why it isn't working. Which of the following is not an answer that you would give him?A. The host's default gateway is down.B. The destination host is not powered on.C. The IP address of the router interface is incorrect.D. The IP address of the switch to which the destination host connects is incorrect.E. The host is in a different subnet. 24: Which of the following classes of IP addresses is utilized for multicasting?A. Class AB. Class BC. Class CD. Class D 25: You give your IT department a spreadsheet of IP addresses and their subnets. You receive a call from one of the junior techs asking what the /26 means next to the IP addresses. You tell her: A. It represents the number of hosts possible on that subnetwork.B. It represents the number of subnetworks that are being used.C. It represents the class of IP address being used.D. It represents the number of bits in the subnet mask that are 1. 26: You are given an IP network of 192.168.5.0 and told that you need to separate this network into subnetworks that can support a maximum of 16 hosts per subnet. This will help alleviate congestion on the network. What subnet mask can you use to create the subnets necessary to meet the given criteria?A. 255.0.0.0B. 255.255.0.0C. 255.255.255.0D. 255.255.255.224E. 255.255.255.240 27: Which of the following would a Class A network be assigned to?A. Government agencyB. Small-to-medium sized corporationC. SOHOD. An individual 28: A client has the IP address192.168.5.98/27. Which of the following addresses are on the same subnet as this host? (Choose two.)A. 192.168.5.95B. 192.168.5.100C. 192.168.5.128D. 192.168.5.110 29: Which of the following IP addresses is not a public IP address that can be routed over the Internet?A. 2.3.4.5B. 11.12.13.14C. 165.23.224.2D. 172.31.45.34E. 203.33.45.22 30: You are given a Class B network. Whatis the default subnet mask assigned to the Class B network?A. 255.255.255.255B. 255.255.0.0D. 0.0.0.0 31: You are troubleshooting your router's interfaces. For some reason, the Ethernet interface will not accept the IP address of 192.168.5.95/27 that you've assigned. Which of the following explains the router's refusal to take the IP address?A. Class C addresses cannot be assigned to Ethernet interfaces.B. The /27 is an invalid mask.C. It is a broadcast address.D. It is a public IP address.E. It is a private IP address. 32: You are a network technician at Acme, Inc. You are required to divide the 172.12.0.0 network into subnets. Each subnet must have the capacity of 458 IP addresses. Also, according to the requirements, you must provide the maximum number of subnets. Which subnet mask should you use?A. 255.255.255.254C. 255.255.240.254D. 255.255.0.0 33: What is the subnetwork and broadcast IP address of 192.168.2.37 with the subnet mask of255.255.255.248?A. 192.168.2.24/192.168.2.31B. 192.168.2.32/192.168.2.39C. 192.168.2.40/192.168.2.47D. 192.168.2.48/192.168.2.55E. 192.168.2.56/192.168.2.63 34: One of your co-workers at Acme, Inc., needs to convert the binary number 11011010 into a decimal. What is the decimal equivalent?A. 218B. 219C. 220D. 221E. 222 35: One of your co-workers at Acme, Inc., needs to convert the binary number 01011010 into a decimal. What is the decimal equivalent?A. 75B. 83C. 90D. 97 36: One of your co-workers at Acme, Inc., needs to convert the binary number 11010110 into a decimal. What is the decimal equivalent?A. 198B. 214C. 252D. 255 37: One of your co-workers at Acme, Inc., needs to convert the binary number 10110110 into a decimal. What is the decimal equivalent?A. 182B. 192C. 202D. 212 38: You are configuring a subnet for the Acme, Inc., branch office in Beijing. You need to assign IP addresses to hosts in this subnet. You have been given the subnet mask of 255.255.255.224. Which of these IP addresses would be valid? (Choose three.)A. 15.234.118.63B. 92.11.178.93C. 134.178.18.56D. 192.168.16.87E. 201.45.116.159F. 217.63.12.192 39: You are a network technician at Acme, Inc. You have subnetted the 208.98.112.0 network with a /28 mask. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router is using ip subnet-zero?A. 62 networks and 2 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hostsE. 16 networks and 14 hosts 40: What is a disadvantage of using a connection-oriented protocol such as TCP?A. Packet acknowledgment might add overhead.B. Packets are not tagged with sequence numbers.C. Loss or duplication of data packets is more likely to occur.D. The application layer must assume responsibility for the correct sequencing of the data packets. 41: You are a network technician at Acme, Inc. You have subnetted the 192.168.72.0 network with a /30 mask for connections between your routers. Your boss asks you how many usable subnetworks and usable host addresses per subnet this will provide. What should you tell her, assuming your router cannot use ip subnet-zero?A. 62 networks and 2 hostsC. 8 networks and 32 hostsD. 16 networks and 16 hostsE. 14 networks and 14 hosts 42: Which of the following IP addresses are considered "network" addresses with a /26 prefix? (Choose two.)A. 165.203.2.0B. 165.203.5.192C. 165.203.6.63D. 165.203.6.191E. 165.203.8.255 43: Identify three valid hosts in any subnet of 192.168.32.0, assuming the subnet mask used is 255.255.255.240. (Choose three.)A. 192.168.32.33B. 192.168.32.112C. 192.168.32.119D. 192.168.32.126E. 192.168.32.175F. 192.168.32.208 44: A Class C network address has been subnetted with a /27 mask. Which of the following addresses is a broadcast address for one of the resulting subnets?A. 198.57.78.33B. 198.57.78.64C. 198.57.78.97D. 198.57.78.97E. 198.57.78.159F. 198.57.78.254 45: What is the subnetwork address for a host with IP address 165.100.5.68/28?A. 165.100.5.0B. 165.100.5.32C. 165.100.5.64D. 165.100.5.65E. 165.100.5.31F. 165.100.5.1 46: Your boss wants to know what TCP stands for. What do you tell him?A. Transmission Check ProtocolB. Transport Check ProtocolC. Transmission Control ProtocolD. Transport Control Protocol 47: Your boss wants to know what UDP stands for. What do you tell him?A. Unreliable Data ProtocolB. Unreliable Data ProgramC. User-Defined ProtocolD. User Datagram Protocol 48: Which of the following statements accurately describes UDP?A. UDP copies files between a computer and a system running rshd, the remote shell service (daemon).B. UDP is a member of the TCP/IP suite of protocols that governs the exchange of electronic mail between message transfer agents.C. UDP is a member of the TCP/IP suite of protocols and is used to copy files between two computers on the Internet. Both computers must support their respective roles: one must be a client, and the other a server.D. UDP is a TCP complement that offers a connectionless datagram service guaranteeing neither delivery nor correct sequencing of delivered packets (much like IP). 49: Which of the following host addresses are members of networks that can be routed across the public Internet? (Choose three.)A. 10.20.12.64B. 172.16.32.129C. 172.64.32.34D. 192.168.23.252E. 196.104.12.95F. 214.192.48.254 50: You are connecting your Serial 0/1 interface to the Internet. Which of the following need to be done for the connection to work? (Choose two.)A. Assign a public IP address.B. Use the shutdown command.C. Use the no shutdown command.D. Make sure the interface is running in full-duplex.（2）Basic IOS Configuration1: In which of the following modes in Cisco's IOS can you issue show commands? (Choose two.)A. UserB. PrivilegedC. Line ConfigurationD. Global Configuration 2: Yo u are the network administrator for a large corporation. You want to be able to store all your configurations in a centralized location. Which of these servers will allow you to do so? (Choose two.)A. FTPB. TFTPC. SQLD. Oracle 3: You need to troubleshoot your network IP connectivity. Which of the following commands would you use to find the IP address on your Ethernet 0 interface?A. pingB. IPConfigC. tracerouteD. Show interface Ethernet 0 4: Which command would you use at the CLI in User mode to enter Privileged EXEC mode?A. PrivilegeB. AdminC. EnableD. Disable 5: You have just received 14 Catalyst switches for your network. You would like to install these switches into your production network to provide separate collision domains for each of the connected devices. What configuration is required to provide this functionality? A. No configuration is required.B. You must set up an IP address on the switch.C. You must configure unique VLANs on the switches.D. You must install the Cisco IOS. 6: Which of the following prompts indicates your router is in Privileged EXEC mode?A. Router>B. Router#C. Router&D. Router$ 7: You have made a console connection to your Cisco Catalyst switch and you see the > symbol in HyperTerminal. What does it mean?A. You are in Privileged EXEC mode.B. You are in User EXEC mode.C. The switch has not been configured.D. The switch is in need of repairs. 8: You would like to assign a meaningful name to your Catalyst switch. What command should you use?A. enableB. host nameC. hostnameD. name 9: You need to assign an IP address to your Catalyst 2950 switch. You are at the HQ_SW1> prompt. What is the correct series of commands? (cr = carriage return)A. enable ip address 10.1.1.1B. enable ip address 10.1.1.1 255.255.255.0C. enable configure terminal ip address 10.1.1.1255.255.255.0D. enable configure terminal interface vlan 1 ip address10.1.1.1 255.255.255.0 10: Which of the following commands displays the syntax for the clock command?A. cl?B. clock?C. clock ?D. cl ?11: Which of the following commands allows you to configure a welcoming message whenever you log in to a router?A. Router(config)# banner messageB. Router(config)# banner motd &C. Router# banner motd #D. Router# banner message ! 12: You need to connect to your 2621XM router to configure an interface. Which of the following methods allows you to connect to and issue commands on the router? (Choose three.) A. TelnetB. FTPC. Console connectionD. AUX connection 13: You want to prevent unauthorized users from plugging their laptops into the router. What type of password helps prevent this issue?A. vtyB. InterfaceC. ConsoleD. Enable 14: You have connected to the console port and are running HyperTerminal. You see only scrambled characters and symbols. What is the most likely solution to this problem?A. Change the connectors.B. Use a different Terminal program.C. Reset the router.D. Adjust the baud rate of your COM port.[View full size image] 15: Which of the following commands would you type to receive this output shown in the figure above?A. Show running-configB. Show startup-configC. Show ip routeD. Show version 16: You are configuring a router named East for authentication with a router named West using CHAP. What username should you configure on East to allow the routers to communicate?A. EastB. WestC. SouthD. North 17: What is the default point-to-point encapsulation protocol used on a Cisco router?A. PPPB. SLIPC. HDLCD. ATM 18: What type of handshake occurs with CHAP authentication?A. One-wayB. Two-wayC. Three-wayD. Mutual 19: You have connected to your Cisco router through a Telnet connection. To test one of your connections, you use a debug ip packet command. Even though you are sure traffic is passing through your router,nothing is reported in your terminal window. What is the most likely cause of this problem?A. There is no debug ip packet command.B. You need to type in the terminal monitor command to see debug output from a Telnet session.C. This command displays information only if the interface experiences trouble. No output indicates that the interface is fine.D. Cisco routers do not allow you to enable debug commands remotely due to security restrictions.[View full size image] 20: Which of the following commands would you type to see this output on your Cisco router shown in the previous figure?A. Show versionB. Show running-configC. Show startup-configD. Show router setup21: Which of the following commands would you type to see this output shown in the figure above?A. Show interface Ethernet 0/0B. Show ip interface detailC. Show interface Serial 0/1D. Show ip interface brief22: Your routers at ACME, Inc., are having someconnectivity issues. You issue show commands for each connecting router's interface. Why are they unable to communicate (see figures above)?A. Incorrect IP addressB. Wrong routing protocolC. Bad cableD. Encapsulation mismatch 23: You need to back up the configurations you just made, but no TFTP servers are available. Which of the following commands are options to back up your currently running configuration? (Choose two.)A. Router1#copy running-config startup-configB. Router1#copy running-config flashC. Router1#copy startup-config running-configD. Router1#copy running-config http 24: You are consulting a small business that is establishing its first WAN link. The client wants to know what encapsulation you will be using on the link. Which of the following are valid encapsulations for WAN links? (Choose three.)A. Frame relayB. EthernetC. Token ringD. PPPE. HDLC 25: Your boss is concerned about security on your network. She wants to make sure that no one can identify passwords if he or she happens to view a configuration on your router. What command encrypts all passwords on your router?A. Router1#service password-encryptionB. Router1(config)#service password-encryptionC. Router1#enable secret passwordD. Router1(config)#enable secret password 26: You need to set up a password that will prevent unauthorized users from telnetting into your router. What series of commands would you use?A. Acme1(config)# line console 0 Acme1(config-line)# password acme Acme1(config-line)# loginB. Acme1(config)# line vty 0 Acme1(config-line)# enable password acmeC. Acme1(config)# line vty 0 Acme1(config-line)# enable secret acme Acme1(config-line)# loginD. Acme1(config)# line vty 0 Acme1(config-line)# password acme Acme1(config-line)# login27: When you are setting up your serial interfaces, what does the clockrate command do for your connection?A. Establishes the timing at which you send dataB. Establishes keepalivesC. Establishes the advertised bandwidthD. Establishes the time on the router 28: You need to set up passwords on all your default Telnet lines. What command would you start with?A. Router1(config)#telnet configurationB. Router1(config)#interface Ethernet 0/1C. Router1(config)#line vty 1 5D. Router1(config)#line vty 0 4 29: You can execute show commands at which prompt? (Choose two.)A. Router1#B. Router1(config)#C. Router1(config-router)#D. Router1>E. romon1> 30: You are configuring your router and type in an Enable password and an Enable Secret password. Your fellow network technician asks you why you have two passwords set when you need only one. What do you tell him?A. The Enable password is used by low-level applications.B. If you reverted to an older version of the IOS, it would not understand the Secret password.C. Both passwords are treated the same.D. It is a failsafe method of ensuring that people need to type two passwords instead of just one.31: You need to get back to Privileged EXEC mode from Interface Configuration mode. What is the quickest method?A. Ctrl+Shift+6; then press XB. Ctrl+EscC. Ctrl+ZD. Type exit 32: When you are establishing a PPP link, which of the following would be negotiated? (Choose three.)A. IPCPB. CHAPC. UDPD. Q.931E. Multilink Protocol 33: Which of the following commands returns your router to a previously saved configuration?A. Router1#setupB. Router1#copy running-config startup-configC. Router1#copy startup-config running-configD. Router1#reload 34: You are in Interface Configuration mode and would like to recall the last command you typed, move your cursor to the beginning of the command line, and type no before the recalled command. You notice your up- and down-arrow keys do not function because you are using an older terminal program. What command combinations could you use to recall the previous command and move your cursor to the beginning of the line?Press Ctrl+P to recall the previous command and Ctrl+A to move to the beginning of the command line.Press Ctrl+L to recall the previous command and Ctrl+B to move to the beginning of the command line.Press Ctrl+D to recall the previous command and Ctrl+A to move to the beginning of the command line.Press Ctrl+E to recall the previous command and Ctrl+A to move to the beginning of the command line. 35: What is the baud rate setting for your terminal emulation program so that you can communicate through your console port?A. 2400B. 9600C. 14400D. 36300 36: What must be configured on a Cisco device to enable Telnet functionality?A. A management IP addressB. SNMPC. CDPD. vty ports 37: You are configuring your Cisco router and need to go back to User EXEC mode. What command takes you back to User EXEC mode?A. Router1#enableB. Router1#exitC. Router1#configure terminalD. Router1#disable 38: Which of the following commands places an IP address on your Catalyst switch?A. Switch1#ip address 10.2.2.2 255.255.255.0B. Switch1(config)#Set IP 10.2.2.2 255.255.255.0C. Switch1(config-vlan)#ip address 10.2.2.2D. Switch1(config-vlan)#ip address 10.2.2.2 255.255.255.0 39: Which of the following commands would you enter to receive this output shown in the figure above?A. Router1#show NVRAMB. Router1#show FlashC. Router1#show Flash-MemD. Router1#show Version 40: Your senior network administrator is unable to telnet to a Catalyst switch because she forgot the IP address. You have physical access and are able to console in. Which of the following commands is the best to get the IP address on the switch? A.Switch1#show ipB. Switch1#show vlan 1C. Switch1#show ip routeD. Switch1#show interface vlan141: You have powered up your Cisco 3640 router. The first thing you see is this output. Which of the following statements about this screen is accurate (see figure above)?A. Your IOS is corrupt and unable to load.B. Your configuration is missing parameters.C. You do not have a configuration saved in NVRAM.D. You have typed setup in the Privileged mode. 42: You type in a command and are shown the following output:% Ambiguous command: "show con"What does this mean?A. You did not enter enough characters for your device to recognize the command.B. You did not enter all the keywords or values required by this command.C. You entered the command incorrectly.D. Context-sensitive help is unable to help you with this command. 43: You are typing a command into the Cisco IOS.It is more than one terminal line long. What will the IOS do?A. The router automatically moves the cursor to the next line and uses a caret (^) to indicate the line break.B. The router truncates the command because commands longer than one line are not allowed.C. The router automatically scrolls the line to the left and uses a dollar sign ($) to indicate that there is text to the left of the $.D. The router shortens all the commands to squeeze the command on to the screen. 44: You want to change the size of the command history buffer. Which of the following commands will set it permanently to 100?A. Router1#terminal history 100B. Router1#history size 100C. Router1(config)#terminal history 100D. Router1(config-line)#history size 100 45: You have configured a description on your serial interfaces. Which of the following commands displays the description? (Choose two.)A. Show running-configB. Show flashC. Show interfacesD. Show ip protocols 46: You are typing commands into your Cisco IOS on your 3640 router. However, your typing is consistently interrupted by console messages, forcing you to retype. Which of the following commands forces the IOS to retype your original input after it displays the console message?A. Exec-timeoutB. Logging synchronousC. Line consoleD. Exec message readout 47: You are configuring a router and issue the command interface ethernet 1/0/0. What do the numbers represent?A. Slot/port/interfaceB. Slot/interface/portC. Port/slot/port numberD. Slot/port adapter/port number 48: Which of the following commands correctly sets the physical speed of a serial interface to 64Kbps?A. Router1(config-if)#bandwidth 64B. Router1(config-if)#bandwidth 64000C. Router1(config-if)#clockrate 64D. Router1(config-if)#clockrate 64000 49: In what mode do you use the encapsulation command?A. Interface Configuration modeB. Sub-interface Configuration modeC. User modeD. Privileged mode 50: You are configuring your router, and your boss happens to look over your shoulder as you type a show running-config command. She sees one of the lines that says password 7 14361F009A056E7D and asks what this means. What do you tell her?A. It is the actual password.B. It is the result of a service password-encryption command.C. The console output made a mistake.D. It is the result of an enable secret command.。

ccna考试题及答案

ccna考试题及答案1. 以下哪项是网络层的功能？A. 路由选择B. 错误检测C. 流量控制D. 封装数据包答案：A2. 在OSI模型中，哪一层负责在网络中传输数据？A. 应用层B. 传输层C. 会话层D. 网络层答案：D3. 以下哪个协议是用于在IP网络中发现网络设备的？A. ARPB. RARPC. ICMPD. OSPF答案：A4. 在TCP/IP模型中，哪一层与OSI模型的传输层相对应？A. 应用层B. 互联网层C. 网络接口层D. 传输层答案：D5. 以下哪个地址是一个有效的IPv4地址？A. 192.168.1.256B. 192.168.1.1C. 10.0.0.0D. 172.16.300.1答案：B6. 在配置路由器时，以下哪个命令用于进入全局配置模式？A. enableB. configure terminalC. privileged execD. user exec答案：B7. 以下哪个命令用于在Cisco设备上显示当前配置？A. show running-configB. show startup-configC. show configD. show current-config答案：A8. 在Cisco设备上，以下哪个命令用于保存当前的配置到启动配置文件？A. copy running-config startup-configB. copy startup-config running-configC. save running-configD. save startup-config答案：A9. 以下哪个命令用于在Cisco设备上查看所有接口的状态？A. show interfacesB. show ip interface briefC. show interface statusD. show running-config interface答案：B10. 在Cisco设备上，以下哪个命令用于关闭接口？A. shutdownB. no shutdownC. disableD. no enable答案：A11. 以下哪个命令用于在Cisco设备上启用接口？A. shutdownB. no shutdownC. disableD. no enable答案：B12. 在配置静态路由时，以下哪个命令用于指定下一跳地址？B. ip static-routeC. route ipD. static-route ip答案：A13. 以下哪个命令用于在Cisco设备上清除ARP表？A. clear arp-cacheB. clear arpC. clear arp tableD. clear ip arp答案：D14. 在配置动态路由协议时，以下哪个命令用于在接口上启用RIP？A. ip rip enableB. ip rip receiveD. network rip答案：C15. 以下哪个命令用于在Cisco设备上查看RIP路由表？A. show ip ripB. show ip route ripC. show ripD. show ip protocols答案：B16. 在配置EIGRP时，以下哪个命令用于指定自动汇总？A. metric weightsB. auto-summaryC. network auto-summaryD. no auto-summary答案：B17. 以下哪个命令用于在Cisco设备上查看EIGRP邻居？A. show ip eigrp neighborsB. show eigrp neighborsC. show ip eigrpD. show eigrp interfaces答案：A18. 在配置OSPF时，以下哪个命令用于指定路由器ID？A. router-idB. router ospfC. networkD. area答案：A19. 以下哪个命令用于在Cisco设备上查看OSPF路由表？A. show ip ospfB. show ip ospf databaseC. show ospfD. show ip route ospf答案：D20. 在配置VLAN时，以下哪个命令用于创建一个新的VLAN？A. vlan databaseB. configure terminalC. vlan [vlan-id]D. new-vlan答案：C21. 以下哪个命令用于将接口分配给VLAN？A. switchport mode accessB. switchport mode trunkC. switchport access vlan [vlan-id]D. switchport trunk vlan [vlan-id]答案：C22. 在配置交换机时，以下哪个命令用于将接口设置为Trunk 模式？A. switchport mode accessB. switchport mode trunkC. switchport access vlan [vlan-id]D. switchport trunk vlan [vlan-id]答案：B23. 以下哪个命令用于在Cisco设备上查看VLAN配置？A. show vlanB. show vlan briefC. show vlan detailD. show vlan all答案：B24. 在配置VTP时，以下哪个命令用于将交换机设置为VTP服务器模式？A. vtp mode serverB. vtp mode clientC. vtp mode transparentD. vtp mode off答案：A25. 以下哪个命令用于在Cisco设备上查看VTP状态？A. show vtp statusB. show vtp statisticsC. show vtp passwordD. show vtp configuration答案：A26. 在配置STP时，以下哪个命令用于设置根桥？A. spanning-tree root primaryB. spanning-tree root secondaryC. spanning-tree root primary [priority]D. spanning-tree root secondary [priority]答案：C27. 以下哪个命令用于在Cisco设备上查看STP状态？A. show spanning-treeB. show spanning-tree detailC. show spanning-tree summaryD. show spanning-tree interface答案：A28. 在配置VLAN Trunking Protocol (VTP) 时，以下哪个命令用于设置VTP域名？A. vtp domain [domain-name]B. vtp password [password]C. vtp mode [mode]D. vtp version [version]答案：A29. 以下哪个命令用于在Cisco设备上查看当前的VTP版本？A. show vtp statusB. show vtp statisticsC. show vtp passwordD. show vtp configuration答案：A30. 在配置端口安全时，以下哪个命令用于限制接口上可以学习到的最大MAC地址数量？A. switchport port-security maximum [mac-count]B. port-security maximum [mac-count]C. switchport port-security violation restrictD. port-security violation shutdown答案：A这些题目和答案仅供学习和参考之用，实际的CCNA考试内容和形式可能会有所不同。

ccna测试题及答案

ccna测试题及答案CCNA测试题及答案一、选择题1. 在Cisco设备上，以下哪个命令用于查看当前的路由表？A. show ip routeB. show running-configC. show interface statusD. show version答案：A2. 以下哪个协议用于在网络中自动发现其他设备？A. ARPB. CDPC. ICMPD. TCP答案：B3. 以下哪个命令用于配置Cisco设备上的接口？A. configure terminalB. interfaceC. ip addressD. hostname答案：A二、填空题4. 在Cisco设备上，使用命令_________可以查看接口的配置信息。

答案：show interface5. 静态路由配置中，_________命令用于指定下一跳地址。

答案：ip route6. 动态路由协议可以自动适应网络变化，其中_________是最常见的一种。

答案：RIP（路由信息协议）三、简答题7. 请简述VLAN（虚拟局域网）的作用。

答案：VLAN是一种将局域网内不同物理位置的设备划分为同一逻辑网络的技术，主要用于隔离广播域，提高网络的安全性和效率。

8. 描述交换机和路由器在网络中的基本功能。

答案：交换机主要用于局域网内部，通过MAC地址表来转发数据帧，实现数据包在局域网内的快速交换。

路由器则工作在网络层，使用IP地址来转发数据包，连接不同的网络，并进行路径选择。

四、计算题9. 假设一个子网掩码为255.255.255.192，计算这个子网的可用IP地址范围。

答案：可用IP地址范围为192.168.1.0到192.168.1.62（包含两端）。

五、实验题10. 请根据以下配置文件，列出Router1的接口配置信息。

```Router1show running-configinterface FastEthernet0/0ip address 192.168.1.1 255.255.255.0duplex autospeed auto!interface FastEthernet0/1no ip addressshutdown!interface Serial0/0/0ip address 10.0.0.1 255.255.255.252clock rate 64000!router ospf 1network 192.168.1.0 0.0.0.255 area 0network 10.0.0.0 0.0.0.3 area 0!```答案：- FastEthernet0/0: IP地址为192.168.1.1，子网掩码为255.255.255.0，双工模式和速度均为自动。

CCNA路由部分测试题(含答案)

CCNA路由部分测试题（共50题）1.当路由器接收的IP报文的目的地址不是本路由器的接口IP地址，并且在路由表中未找到匹配的路由项，采取的策略是什么？A.丢掉该分组B.将该分组分片C.转发该分组D.以上答案均不对ANSWER:A2.IGP 的作用范围是？A.区域内B.自然子网范围内C.局域网内D.自治系统内ANSWER:D3.距离矢量协议包括？(多选)A.RIPB.IS-ISC.OSPFD.EIGRPANSWER:A D4.解决路由环问题的办法是？(多选)A.定义路由权的最大值B.路由保持法C.水平分割D.路由器重启ANSWER:A B C5.在rip 中metric 等于什么值为不可达？A.8B.10C.15D.16ANSWER:D6.下列关于OSPF 协议的说法正确的是？(多选)A.OSPF 支持基于接口的报文验证B.OSPF 支持到同一目的地址的多条等值路由C.OSPF 是一个基于链路状态算法的边界网关路由协议D.OSPF 发现的路由可以根据不同的类型而有不同的优先级ANSWER:A B D7.如果一个内部网络对外的出口只有一个，那么最好配置？A.缺省路由B.主机路由C.动态路由ANSWER:A8.以下不属于动态路由协议的是？A.RIPB.ICMPC.EIGRPD.OSPFANSWER:B9.关于矢量距离算法以下哪些说法是错误的？A.矢量距离算法不会产生路由环路问题B.矢量距离算法是靠传递路由信息来实现的C.路由信息的矢量表示法是（目标网络，metric）D.使用矢量距离算法的协议只从自己的邻居获得信息ANSWER:A10.以下哪些路由表项要由网络管理员手动配置？(多选)A.静态路由B.直接路由C.缺省路由D.动态路由ANSWER:A C11.关于RIP 协议，下列说法正确的有？(多选)A.RIP 协议是一种IGPB.RIP 协议是一种EGPC.RIP 协议是一种距离矢量路由协议D.RIP 协议是一种链路状态路由协议ANSWER:A C12.下列关于链路状态算法的说法正确的是？(多选)A.链路状态是对路由的描述B.链路状态是对网络拓扑结构的描述C.链路状态算法本身不会产生自环路由D.OSPF 和RIP 都使用链路状态算法ANSWER:B C13.路由器中时刻维持着一张路由表，这张路由表可以是静态配置的，也可以是什么协议产生的？A.生成树协议B.链路控制协议C.动态路由协议D.被承载网络层协议ANSWER:C14.在路由器中，如果去往同一目的地有多条路由，则决定最佳路由的因素有？(多选)A.路由的优先级B.路由的发布者C.路由的metric 值D.路由的生存时间ANSWER:A C15.下面哪一项正确描述了路由协议？A.允许数据包在主机间转送的一种协议B.定义数据包中域的格式和用法的一种方式C.通过执行一个算法来完成路由选择的一个协议D.指定MAC 地址和IP 地址捆绑的方式和时间的一种协议ANSWER:C16.IGP 包括如下哪些协议？(多选)A.RIPB.BGPC.IS-ISD.EIGRPE.OSPFANSWER:A C D E17.RIP 协议引入路由保持机制的作用是？A.节省网络带宽B.防治网络中形成路由环路C.将路由不可达信息在全网扩散D.通知邻居路由器哪些路由是从其处得到ANSWER:B18.对路由理解正确的是？A.路由是路由器B.路由是信息在网络路径的交叉点C.路由是用以配置报文的目的地址D.路由就是指导报文发送的路径信息ANSWER:D19.路由协议RIP，OSPF和静态路由各自得到了条到达目标网络，在CISCO路由器默认情况下，最终选选定哪种路由作为最优路由？A.RIPB.OSPFC.静态路由ANSWER:C20.在RIP 协议中，计算metric 值的参数是？A.MTUB.时延C.带宽D.路由跳数ANSWER:D21.衡量路由算法好坏的原则不包括？A.快速收敛性B.灵活性，弹性C.拓扑结构先进D.选径是否是最佳ANSWER:C22.RIP 协议是基于？A.UDPB.TCPC.ICMPD.Raw IPANSWER:A23.禁止RIP 协议的路由聚合功能的命令是？A.no route ripB.summanyC.no auto summanyD.undo networkANSWER:C24.解决路由环路的方法有？(多选)A.水平分割B.抑制时间C.毒性逆转D.触发更新ANSWER:A B C D25.路由环问题会引起哪些问题？(多选)A.慢收敛B.广播风暴C.路由器重起D.路由不一致ANSWER:A D26.下列哪些路由协议存在路由自环问题？(多选)A.RIPB.IGRPC.OSPFD.IS-ISE.EIGRPANSWER:A B27.关于RIP V1 和RIP V2，下列说法哪些正确？(多选)A.RIP V1 报文支持子网掩码B.RIP V2 报文支持子网掩码C.RIP V2 缺省使用路由聚合功能D.RIP V1 只支持报文的简单口令认证，而RIP V2 支持MD5 认证ANSWER:B C28.在一个运行OSPF 的自治系统之内？(多选)A.骨干区域自身也必须连通的B.非骨干区域自身也必须连通的C.必须存在一个骨干区域（区域号为0）D.非骨干区域与骨干区域必须直接相连或逻辑上相连ANSWER:A C D29.以下关于Rip 路由聚合的说法正确的是？(多选)A.Rip V1 默认支持路由聚合，需要时可以关闭路由聚合功能B.华为Quidway 系列路由器Rip V2 的实现可以关闭路由聚合功能C.Rip V1 不支持子网路由聚合到一个非自然子网路由D.Rip V2 支持子网路由聚合到一个非自然子网路由ANSWER:B C D30.假设有这样的组网实例:两台路由器（假设为RTA 和RTB）通过串口相接，其中RTA 的串口IP 地址是，RTB 的串口IP 地址是，RTA 通过以太口连接的本地局域网的IP 地址是，RTB 通过以太口连接的本地局域网IP 地址是，在上面所有的接口上都启动RIP V1（仅仅RIP V1）协议，那么，下列说法正确的是？(多选)A.在RTA 的本地局域网上的计算机可以访问在RTB 本地局域网上的计算机B.在RTB 的本地局域网上的计算机可以访问在RTA 本地局域网上的计算机C.在RTA 的本地局域网上的计算机不能访问在RTB 本地局域网上的计算机D.在RTB 的本地局域网上的计算机不能访问在RTA 本地局域网上的计算机ANSWER:C D31.根据路由的目的地不同，路由表可被划分为？(多选)A.子网路由B.直连路由C.缺省路由D.主机路由E.静态路由ANSWER:A D32.对路由器A 配置RIP 协议，并在接口S0（IP 地址为路由协议，在全局配置模式下使用的第一条命令是？A.router ripwork allworkworkANSWER:A33.当接口运行在RIP-2 广播方式时，它可以接受的报文有？(多选)A.RIP-1 广播报文B.RIP-1 组播报文C.RIP-2 广播报文D.RIP-2 组播报文ANSWER:A C34.RIP 协议的路由项在多少时间内没有更新会变为不可达？A.90sB.120sC.180sD.240sANSWER:C35.VLSM 的含义是？A.Variable Length Subnet MaskingB.Variable Length Shortest MaskingC.Very Long/Shortest MaskingD.Variable Long Subnet MaskingE.Variable Length Short MeasurementANSWER:A36.距离矢量路由协议使用水平分割（split horizon）技术的目的是什么？(多选)A.避免在毗邻路由器之间产生路由环路B.确保路由更新数据报文沿着接收路线方向发送C.与保持间隔（holddown）机制协同工作，为保持间隔的计算提供更多的可靠性D.代替路由中毒（poison reverse）算法ANSWER:A C37.作为一个网络维护人员，对于OSPF 区域体系机构的原则必须有清楚地了解，下面的论述表达正确的是？(多选)A.所有的OSPF 区域必须通过边界路由器与区域0 相连，或采用OSPF 虚链路B.所有区域间通信必须通过骨干区域0，因此所有区域路由器必须包含到区域0 的路由C.单个区域不能包含没有物理链路的两个区域边界路由器D.虚链路可以穿越stub 区域ANSWER:A B38.支持可变长子网掩码的路由协议有？(多选)A.RIP v1B.RIP v2C.OSPFD.EIGRPANSWER:B C D39.因为在生成路由表的过程中，OSPF 协议需要进行复杂的SPF 算法来计算网络拓扑结构，所以相对距离矢量路由选择协议来说，它需要更大的开销，更多的延迟，更高的CPU 占用率。

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1Which OSI layer is responsible for binary transmission, cable specification, and physical aspects of network communication
Presentation
Transport
Data Link
Physical
2A n installed fiber run can be checked for faults, integrity, and the performance of the media by using what device?
light injector
OTDR
TDR
multimeter
3When is a straight-through cable used in a network?
when connecting a router through the console port
when connecting one switch to another switch
when connecting a host to a switch
when connecting a router to another router
4W hich fiber connector supports full duplex Ethernet?
5Which type of cable run is most often associated with fiber-optic cable?
backbone cable
horizontal cable
patch cable
work area cable
6W hich of the following is a characteristic of single-mode fiber-optic cable?
generally uses LEDs as the light source
relatively larger core with multiple light paths
less expensive than multimode
generally uses lasers as the light source
7
Refer to the exhibit. Which type of Category 5 cable is used to make an Ethernet connection between Host A and Host B?
coax cable
rollover cable
crossover cable
straight-through cable
8I n LAN installations where potential electrical hazards or electromagnetic interference may be present, what type of media recommended for backbone cabling?
coax
fiber
Cat5e UTP
Cat6 UTP
STP
9In most business LANs, which connector is used with twisted-pair networking cable?
BNC
RJ-11
RJ-45
Type F
10What are three measures of data transfer? (Choose three.)
goodput
frequency
amplitude
throughput
crosstalk
bandwidth
11Which method of signal transmission uses radio waves to carry signals?
electrical
optical
wireless
acoustic
12W hich characteristics describe fiber optic cable? (Choose two.)
It is not affected by EMI or RFI.
Each pair of cables is wrapped in metallic foil.
It combines the technique of cancellation, shielding and twisting to protect data.
It has a maximum speed of 100 Mbps.
It is the most expensive type of LAN cabling.
13What is a primary role of the Physical layer in transmitting data on the network?
create the signals that represent the bits in each frame on to the media
provide physical addressing to the devices
determine the path packets take through the network
control data access to the media
14W hat characteristic of UTP cable helps reduce the effects of interference?
the metal braiding in the shielding
the reflective cladding around core
the twisting of the wires in the cable
the insulating material in the outer jacket
15What is considered a benefit of wireless as a media choice?
more host mobility
lower security risks
reduced susceptibility to interference
less impact of the surroundings on the effective coverage area
16W ith the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs?
the magnetic field around the adjacent pairs of wire
the use of braided wire to shield the adjacent wire pairs
the reflection of the electrical wave back from the far end of the cable
the collision caused by two nodes trying to use the media simultaneously
17What is a possible effect of improperly applying a connector to a network cable?
Data will be forwarded to the wrong node.
Data transmitted through that cable may experience signal loss.
An improper signaling method will be implemented for data transmitted on that cable.
The encoding method for data sent on that cable will change to compensate for the improper connection.。