CCNA（）题库V104.4（）

培训大讲堂官方 YY 频道 :3660 CCNA 题库考试代号 : 640-802 考试时间 : 英文 110+30=140 分钟通过分数 : 825 题库版本 : V104.4 鸿鹄论坛招募 CCNA CCNP 答疑讲师答疑地点 : 鸿鹄官方 YY 频道 3660 鸿鹄大讲堂 :http://om/thread-46172-1-1.html 培训大讲堂官方 YY 频道 :3660 CCNA 题库战报交流 1 QQ 群 : 190906300 (500 人超级群 ) CCNA 题库战报交流区 : http://om/forum-261-1.html 1000 G 视频教程免费下载 :http://om/forum-228-1.html

CCNA(640-802) 题库 V104.4 Number: 640-802 Passing Score: 825 Time Limit: 120 min File Version: 104.4 CCNA(640-802) 题库 V104.4(2012.4.9) CCNA 题库战报 500 人超级 QQ 群 190906300 CCNA 最新题库 / 最新战报发布区 : http://om/forum-261-1.html 下载官方正版题库看最新考试战报, 请随时关注鸿鹄论坛 http://om CCNA 考试报名 1900, 详情请联系鸿鹄全国区十七名客服 QQ 712023090-712023106 [ 全国唯一 ] 报名思科 CCNA 考试, 送思科真实设备试验 http://om/thread- 153631-1-1.html ======================================== 更新内容 : V104.1 修正 V104 中错误题目, 确定经典争议题目答案 ; V104.2 增加拖图题并可完美模拟考试,VCE 题库增加中文注释 ; V104.3 针对思科 CCNA 考试变题, 更新考试新增题目 93Q, 更新 V104.2 实验题 ; V104.4 增加全文中文注释, 汇总 V104.3 九次更新, 删除部分旧题目, 为目前最新官方正版题库 ; 2011.8.1 增加每日新题, 修订部分错误 2012.2.14 情人节版 2012.4.9 增加 6 道选择题 524-529 增加 1 道拖图题 561 修改 322 435 439 505 题答案修改 472 题图片 =============================================

Sections 1. Chapter 1: Introduction 2. Chapter 2: TCP/IP 3. Chapter 3: IP Addressing and VLSM 4. Chapter 4: Introduction to Cisco IOS 5. Chapter 5: Managing Cisco IOS 6. Chapter 6: IP Routing 7. Chapter 7: Security 8. Chapter 8: NAT 9. Chapter 9: Switching 10. Chapter 10: VLAN 11. Chapter 11: Wireless 12. Chapter 12: Security Device Manager (SDM) 13. Chapter 13: IPv6 14. Chapter 14: Wide Area Network (WAN) 15. New-1 16. New-2 17. New-3 18. New-4 19.Drag n Drop

Exam A QUESTION 1 When you are logged into a switch, which prompt indicates that you are in privileged mode? A. % B. @ C. > D. $ E. # Answer: E Section: Chapter 4: Introduction to Cisco IOS 特权模式就是 # 提示符 QUESTION 2 Which command shows system hardware and software version information? A. show configuration B. show environment C. show inventory D. show platform E. show version Answer: E Section: Chapter 4: Introduction to Cisco IOS 查看系统的软件和硬件信息使用的命令是 show version QUESTION 3 Cisco Catalyst switches CAT1 and CAT2 have a connection between them using ports FA0/13. An 802. 1Q trunk is configured between the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 the native 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. Answer: C Section: Chapter 10: VLAN 如果两边 native 不匹配的话.switch 将报 native 不匹配的日志信息 QUESTION 4 Which command would correctly configure a serial port on a router with the last usable host address in the 192.216.32.32/29 subnet? A. Router(config-if)# ip address 192.216.32.38 255.255.255.240 B. Router(config-if)# ip address 192.216.32.39 255.255.255.224 C. Router(config-if)# ip address 192.216.32.63 255.255.255.248

D. Router(config-if)# ip address 192.216.32.39 255.255.255.248 E. Router(config-if)# ip address 192.216.32.63 255.255.255.248 F. Router(config-if)# ip address 192.216.32.38 255.255.255.248 Answer: F Section: Chapter 4: Introduction to Cisco IOS 192.216.32.32/29 它的块大小为 8 掩码为 255.255.255.248 地址范围为 192.216.32.32-39 QUESTION 5 The network default gateway applying to a host by DHCP is 192.168.5.33/28. Which option is the valid IP address of this host? A. 192.168.5.55 B. 192.168.5.47 C. 192.168.5.40 D. 192.168.5.32 E. 192.168.5.14 Answer: C Section: Chapter 3: IP Addressing and VLSM 考点 : 考查 VLSM 192.168.5.33/28 所在网段的范围是 192.168.5.32--192.168.5.47/28 A: 超出范围 B: 广播地址 C: 正确 D: 网络号 E: 超出范围 QUESTION 6 Which two addresses can be assigned to a host with a subnet mask of 255.255.254.0? (Choose two.) A. 113.10.4.0 B. 186.54.3.0 C. 175.33.3.255 D. 26.35.2.255 E. 17.35.36.0 Answer: BD Section: Chapter 3: IP Addressing and VLSM 考点 : 考查 VLSM A: 网络号 B/D: 正确 C: 广播地址 E: 网络号 QUESTION 7 The network administrator has asked you to check the status of the workstation's IP stack by pinging the loopback address. Which address would you ping to perform this task? A. 10.1.1.1

B. 127.0.0.1 C. 192.168.0.1 D. 239.1.1.1 Answer: B Section: Chapter 3: IP Addressing and VLSM 考点 : 使用 ping 来检测主机的 IP 栈 ping 127.0.0.1 实现 QUESTION 8 Workstation A has been assigned an IP address of 192.0.2.24/28. Workstation B has been assigned an IP address of 192.0.2.100/28. The two workstations are connected with a straight-through cable. Attempts to ping between the hosts are unsuccessful. What two things can be done to allow communications between the 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. Answer: AB Section: Chapter 3: IP Addressing and VLSM 考点 : 同构设备使用交叉线, 两端的 IP 需要在同一个子网 A: 使用交叉线替换现有的直通线正确 B: 修改掩码为 25 位, 正确 C: 修改掩码为 26 为, 错误不能使他们在同一个子网 D/E: 错误, 都不能使他们在同一个子网 QUESTION 9 Your ISP has given you the address 223.5.14.6/29 to assign to your router's interface. They have also given you the default gateway address of 223.5.14.7. After you have configured the address, the router is unable 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. Answer: B Section: Chapter 3: IP Addressing and VLSM 考点 : 考查 VLSM 223.5.14.6/29 所在网段的范围是 :223.5.14.0--223.5.14.7/29 A: 默认网关不属于这个子网, 错误 B: 默认网关是这个子网的广播地址, 正确 C: 这个地址是子网的广播地址, 错误 D: 这个地址是组播地址, 错误 QUESTION 10 Which command is used to copy the configuration from RAM into NVRAM?

A. copy running-config startup-config B. copy startup-config: running-config: C. copy running config startup config D. copy startup config running config E. write terminal Answer: A Section: Chapter 4: Introduction to Cisco IOS QUESTION 11 Which command is used to load a configuration from a TFTP server and merge the configuration into RAM? A. copy running-config: TFTP: B. copy TFTP: running-config C. copy TFTP: startup-config D. copy startup-config: TFTP: Answer: B Section: Chapter 4: Introduction to Cisco IOS QUESTION 12 A system administrator types the command to change the hostname of a router. Where on the Cisco IFS is that change stored? A. NVRAM B. RAM C. FLASH D. ROM E. PCMCIA Answer: B Section: Chapter 4: Introduction to Cisco IOS running-config 保存在 RAM 中 startup-config 保存在 NVRAM 中 QUESTION 13 Which command is used to configure a default route? A. ip route 172.16.1.0 255.255.255.0 0.0.0.0 B. ip route 172.16.1.0 255.255.255.0 172.16.2.1 C. ip route 0.0.0.0 255.255.255.0 172.16.2.1 D. ip route 0.0.0.0 0.0.0.0 172.16.2.1 Answer: D Section: Chapter 6: IP Routing

QUESTION 14 If IP routing is enabled, which two commands set the gateway of last resort to the default gateway? (Choose two.) A. ip default-gateway 0.0.0.0 B. ip route 172.16.2.1 0.0.0.0 0.0.0.0 C. ip default-network 0.0.0.0 D. ip default-route 0.0.0.0 0.0.0.0 172.16.2.1 E. ip route 0.0.0.0 0.0.0.0 172.16.2.1 Answer: CE Section: Chapter 6: IP Routing 产生默认网关的两种方式 ip default-network ip route QUESTION 15 Which command would you configure globally on a Cisco router that would allow you to view directly connected Cisco devices? A. enable cdp B. cdp enable C. cdp run D. run cdp Answer: C Section: Chapter 5: Managing Cisco IOS QUESTION 16 Which command is used to see the path taken by packets across an IP network? A. show ip route B. show route C. traceroute D. trace ip route Answer: C Section: Chapter 2: TCP/IP 哪条命令用于查看数据包转发所经过的路径 A: 查看路由表 B: 没有这条命令 C: 正确 D: 没这条命令

QUESTION 17 Which command is used to debug a ping command? A. debug icmp B. debug ip icmp C. debug tcp D. debug packet Answer: B Section: Chapter 5: Managing Cisco IOS ping 调用了 icmp 协议, 而 icmp 数据包封装在 ip 包中 QUESTION 18 Which command displays CPU utilization? A. show protocols B. show process C. show system D. show version Answer: B Section: Chapter 5: Managing Cisco IOS 查看 CPU 利用率 QUESTION 19 When configuring a serial interface on a router, what is the default encapsulation? A. atm-dxi B. frame-relay C. hdlc D. lapb E. ppp Answer: C Section: Chapter 14: Wide Area Network (WAN) 缺省封装是 HDLC QUESTION 20 What must be set correctly when configuring a serial interface so that higher-level protocols calculate the best route? A. bandwidth B. delay C. load D. reliability Answer: A Section: Chapter 6: IP Routing

为了使高层路由协议计算最佳路由, 串口的什么东西必须被设置正确? 在接口下, 只有带宽是可以配置的 QUESTION 21 A company implements video conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails completely. What is the most likely reason for this? A. minimum cell rate (MCR) B. quality of service (QoS) C. modulation D. packet switching exchange (PSE) E. reliable transport protocol (RTP) Answer: B Section: Chapter 9: Switching 考点 : 当网络中使用视频会议后发现网络非常慢, 什么原因引起的? QoS: 用于定制策略对不同流量进行控制 QUESTION 22 Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication? A. transport B. network C. presentation D. session E. application Answer: E Section: Chapter 1: Introduction 哪一层确定的接收程序的可用性? 应用层提供 QUESTION 23 Data transfer is slow between the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintained. To fix this issue, at which layer should the troubleshooting process begin? A. presentation B. session C. transport D. network E. physical Answer: D Section: Chapter 1: Introduction 解决网络问题, 先确保网络层通信

QUESTION 24 Which protocols are found in the network layer of the OSI reference model and are responsible for path determination and traffic switching? A. LAN B. routing C. WAN D. network Answer: B Section: Chapter 1: Introduction OSI 网络层中什么提供了路径选择和流量转发? 由路由协议提供通过手工或者动态学习路由条目实现 QUESTION 25 Which command reveals the last method used to powercycle a router? A. show reload B. show boot C. show running-config D. show version Answer: D Section: Chapter 5: Managing Cisco IOS 哪一个命令可以显示最近一次被用来重启路由器的方法? QUESTION 26 Which three options are valid WAN connectivity methods? (Choose three.) A. PPP B. WAP C. HDLC D. MPLS E. L2TPv3 F. ATM Answer: ACF Section: Chapter 14: Wide Area Network (WAN) 哪三种封装属于 WAN 链路的? A: 点到点协议, 正确 B: 无线加密技术, 错误 C: 思科缺省封装格式, 正确 D: 多协议标签转换, 错误 E: 隧道协议, 错误 F: 正确 QUESTION 27 Refer to the exhibit. Which WAN protocol is being used?

A. ATM B. HDLC C. Frame Relay D. PPP Answer: C Section: Chapter 14: Wide Area Network (WAN) 由图中的 LMI enq sent 2474988 可看到发送接受 LMI 信息属于 FR 的数据包 QUESTION 28 What 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 signals from a router to a leased line. B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line. C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line. D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line. Answer: D Section: Chapter 14: Wide Area Network (WAN) CSU/DSU 一般是专线,MODEN 是将模拟信号与数字信号转换 QUESTION 29 A network administrator must configure 200 switch ports to accept traffic from only the currently attached host 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 security mac-address command. B. Have end users e-mail their MAC addresses. Telnet to the switch to enter the switchport-port security mac-address command. C. Use the switchport port-security MAC address sticky command on all the switch ports that have end devices connected to them. D. Use show mac-address-table to determine the addresses that are associated with each port and then enter the commands on each switch for MAC address port-security.

Answer: C Section: Chapter 9: Switching 考点 : 有 200 台主机需要接入, 采用什么方式来增强网络安全性? A: 先验证 mac 安全性, 然后在交换机上绑定错误, 工作量太大 B: 用户发送邮件认证再在交换机上配置, 错误, 不科学 C: 使用 port-security, 正确 D: 错误, 工作量太大 QUESTION 30 When 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. Answer: A Section: Chapter 14: Wide Area Network (WAN) 在对 FR 进行排错的时候, 当做回环测试的时候, 第一步如何处理? A: 讲接口配置成 HDLC, 正确,FR 封装下无法正常 ping 自己端口 QUESTION 31 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. Answer: D Section: Chapter 14: Wide Area Network (WAN) 在 FR 网络中, 当 CIR 超过时会发生什么情况? D: 所有超过的流量都丢弃 QUESTION 32 What 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. Answer: BC Section: Chapter 14: Wide Area Network (WAN) 帧中继点到点子接口的特点? A: 水平分割, 错误 B: 每个子接口需要一个独立的网段, 正确

C: 类似专线, 正确 D: 全网互联是理想拓扑, 错误通常是 hub-spoke E:NBMA 不支持 OSPF, 错误 QUESTION 33 Refer to the exhibit. Addresses within the range 10.10.10.0/24 are not being translated to the 1.128.0/16 range. Which command shows if 10.10.10.0/24 are allowed inside addresses? A. debug ip nat B. show access-list C. show ip nat translation D. show ip nat statistics Answer: B Section: Chapter 8: NAT 那条命令可以看到 10.10.10.0/24 是否在允许转换范围允许的范围是通过 ACL 定义的 A: 打开 NAT 转换的 debug 信息, 错误 B: 查看 acl 信息, 正确 C: 查看 NAT 转换表, 错误 D: 查看静态 NAT 错误 QUESTION 34 A wireless client cannot connect to an 802.11b/g BSS with a b/g wireless card. The client section of the access 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. Answer: D Section: Chapter 11: Wireless 客户端无法连接到无限接入点, 查看不到可用的无线信号这通常是 SSID 信号没有配置正确 A: 不正确的信道错误 B: 客户端的 IP 地址配置错误 C: 客户端的共享 key 错误 D:SSID 配置不正确 QUESTION 35 Which two features did WPAv1 add to address the inherent weaknesses found in WEP? (Choose two.) A. a stronger encryption algorithm

B. key mixing using temporal keys C. shared key authentication D. a shorter initialization vector E. per frame sequence counters Answer: BE Section: Chapter 11: Wireless 考点 :WPA1 中增强哪两个在 WEP 中发现的弱点?WEP 存在的隐患主要是依赖共享密钥 A: 更强的加密算法 B: 混合使用的密钥 C: 共享密钥认证 D: 较短的初始化向量 E: 一个帧一个序列计数器 QUESTION 36 Which two wireless encryption methods are based on the RC4 encryption algorithm? (Choose two.) A. WEP B. CCKM C. AES D. TKIP E. CCMP Answer: AD Section: Chapter 11: Wireless 考点 : 哪两种无限加密技术依赖 RC4 A: 有线等效保密协议 B: 英特尔开发一种协议 C: 高级加密标准 D: 暂时密钥集成协议 E: 基于 AES 的加密方式 QUESTION 37 What are two characteristics of RIPv2? (Choose two.) A. classful routing protocol B. variable-length subnet masks C. broadcast addressing D. manual route summarization E. uses SPF algorithm to compute path Answer: BD Section: Chapter 6: IP Routing A: 有类路由协议, 错误 B: 可变长度子网掩码, 正确 C: 采用广播地址更新, 错误 D: 手动路由汇总, 正确 E: 使用 spf 算法计算路径, 错误 QUESTION 38

Which two Ethernet fiber-optic modes support distances of greater than 550 meters? A. 1000BASE-CX B. 100BASE-FX C. 1000BASE-LX D. 1000BASE-SX E. 1000BASE-ZX Answer: CE Section: Chapter 1: Introduction A: 最长距离 25 米 B: 最长距离 100 米 C: 最长距离 3000 米 D: 最长距离 550 米 E: 最长距离 70 千米 QUESTION 39 What 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. Answer: AD Section: Chapter 6: IP Routing 考点 : 考查距离矢量路由协议特性 A: 周期性更新, 正确 B: 发送整个路由表到整个路由域, 错误, 只发送给邻居 C: 使用 SPF 算法, 错误 D: 依靠邻居发送更新来更新路由表, 正确 E: 在数据库中维护整个网络的拓扑错误 QUESTION 40 Refer to the exhibit. According to the routing table, where will the router send a packet destined for 10.1.5.65? A. 10.1.1.2 B. 10.1.2.2

C. 10.1.3.3 D. 10.1.4.4 Answer: C Section: Chapter 6: IP Routing 路由查找原则 : 最长掩码匹配原则 QUESTION 41 Which command shows if an access list is assigned to an interface? A. show ip interface [interface] access-lists B. show ip access-lists interface [interface] C. show ip interface [interface] D. show ip access-lists [interface] Answer: C Section: Chapter 7: Security QUESTION 42 Refer 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. Answer: A Section: Chapter 5: Managing Cisco IOS show ip dhcp conflict 命令可以查看哪些 ip 地址在使用上有冲突有冲突的地址不再分配出去 A: 地址被删除直到冲突解决, 正确 B: 地址保留直到冲突解决, 错误 C/D: 答案片面 E: 当冲突解决后, 地址会被显示错误 QUESTION 43 Refer to the exhibit. You are connected to the router as user Mike. Which command allows you to see output from the OSPF debug command?

A. terminal monitor B. show debugging C. show sessions D. show ip ospf interface Answer: A Section: Chapter 6: IP Routing A: 让 debug 信息在终端上显示出来 B: 没这条命令 C: 查看会话信息 D: 查看启用了 ospf 的接口的相关信息 QUESTION 44 Refer to the exhibit. If number 2 is selected from the setup script, what happens when the user runs setup from 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. Answer: A Section: Chapter 4: Introduction to Cisco IOS [0] 不保存进入 IOS 命令配置模式 [1] 不保存返回设置模式 [2] 保存退出 A: 设置和改动被保存到配置脚本 B: 为有效地重新开始配置, 如果路由器是第一次启动的配置 C: 如果配置了密码, 设置不会运行 D: 设置不可用, 因为它只能在没有配置存在时才有效 QUESTION 45

Refer to the exhibit. Which (config-router) command will allow the network represented on the interface to be advertised by RIP? A. redistribute ethernet0 B. network ethernet0 C. redistribute 10.12.0.0 D. network 10.12.0.0 Answer: D Section: Chapter 6: IP Routing 考点 : 怎么才能让接口通告 RIP 路由通告 network 网段实现 QUESTION 46 Refer 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. Answer: D Section: Chapter 6: IP Routing

由图中可以看出本地已经存在 10.10.1.0 这条路由 QUESTION 47 Refer to the exhibit. What type of connection would be supported by the cable diagram shown? A. PC to router B. PC to switch C. server to router D. router to router Answer: B Section: Chapter 1: Introduction 从图中可以看出这是一条直通线同构设备使用交叉线, 异构设备使用直通线 B: 直通线 AC/D 同构设备使用交叉线 QUESTION 48 Refer to the exhibit. What type of connection would be supported by the cable diagram shown? A. PC to router B. PC to switch C. server to switch D. switch to router Answer: A Section: Chapter 1: Introduction QUESTION 49 Which 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.

Answer: AE Section: (none) 考点 : 考查 vlan 知识点 A: 缺省都存在 vlan1, 端口都属于 vlan1, 正确 B:CDP 信息只发送到 vlan1002, 错误,vlan1002 是 fddi 网络的 vlan 号 C: 缺省情况交换机 IP 配置在 vlan1005, 错误,vlan1005trnet 网络的 vlan 号缺省在 vlan1 里面 D:vlan1002-1005 自动生成并不能被删除, 正确, 他们都是被保留的特殊 vlan QUESTION 50 Refer 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. Answer: A Section: Chapter 4: Introduction to Cisco IOS 启动时缺省读取保存在 NVRAM 里面的配置文件提示进入对话模式, 说明没有保存配置文件 QUESTION 51 Refer to the exhibit. What can be determined from the output? A. 192.168.1.2 is local to the router. B. 192.168.3.1 is local to the router. C. 192.168.1.2 will age out in less than 1 minute. D. 192.168.3.1 has aged out and is marked for deletion. Answer: B Section: Chapter 4: Introduction to Cisco IOS

age 下面 - 代表是本地端口 QUESTION 52 Refer 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 19 B. ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 19 C. ip nat pool mynats 1.1.128.1 1.1.135.254 prefix-length 18 D. ip nat outside mynats 1.1.128.1 1.1.135.254 prefix-length 18 Answer: A Section: Chapter 8: NAT 准确汇总掩码是 21, 答案中没有, 退而求其次选 19. mynats 为地址池的名字,prefix-length 表示掩码的长度 prefix-length 19 表示掩码为 255.255.224.0 QUESTION 53 Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem? A. data link layer B. application layer C. access layer D. session layer E. network layer Answer: E Section: Chapter 2: TCP/IP

ping 调用 icmp,ping 不通是网络层的原因 QUESTION 54 Refer to the exhibit. Which value will be configured for Default Gateway of the Local Area Connection? A. 10.0.0.0 B. 10.0.0.254 C. 192.223.129.0 D. 192.223.129.254 Answer: B Section: Chapter 3: IP Addressing and VLSM 10.0.0.1--10.0.0.254 里面除了 10.0.0.249 外任意一个 QUESTION 55 Refer 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. Answer: D Section: Chapter 6: IP Routing 131.1.123.24/27 所在网络范围为 :131.1.123.0-31/27 很明显网关 131.1.123.33 不再范围内 QUESTION 56 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. Answer: D Section: Chapter 8: NAT 由图中提示信息可以看出, 源为 10.10.0.2 已经有个一个转换, 所以后续的数据包快速转发 QUESTION 57 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 overload B. (config-if) ip nat outside overload C. (config) ip nat inside source list 1 interface ethernet1 overload D. (config-if) ip nat inside overload Answer: C Section: Chapter 8: NAT overload 是配置 PAT 的关键字 QUESTION 58 Refer to the exhibit. What will happen to HTTP traffic coming from the Internet that is destined for 172.16.12.10 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. Answer: C Section: Chapter 7: Security ACL 匹配规则 : 自上而下匹配, 一旦匹配则终止, 没有匹配到的丢弃题目给的 172 是目的地址, 表中 ACL 中 172 是源地址 QUESTION 59 Refer to the exhibit. Which statement describes the effect that the Router1 configuration has on devices in the 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. Answer: B Section: Chapter 7: Security 题目考查的是 ACL 用法, 首先我们看图示 F0/0 是 in 方向,eq 应该放在目的主机的后面, 源主机是随机端口发出访问 f0/1 也设置为 in 方向, 只能控制返回的数据, 这里 eq 应该放在源主机也就是 SVR-A 的后面所以 list 100 中 10 生效,20 无效 list 101 中 10 生效,20 无效最后默认都拒绝, 所以只允许 ssh QUESTION 60 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. Answer: AEF Section: Chapter 10: VLAN A:VLAN 在交换网络中建立广播域, 正确 B: 利用 VLAN 的数据包过滤, 增强网络的安全性错误, 没有这个特性

C: 提供了在大型网络中的保护 IP 地址的方法错误 D: 提供低延迟互联网络替代路由网络错误 E:vlan 允许基于逻辑划分的网络访问, 不是物理位置正确 F:VLAN 可以大大简化添加, 移动或更改网络上的主机正确 QUESTION 61 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. Answer: AC Section: Chapter 9: Switching 要想远程管理 VLAN,1 交换机配置 IP,2 路由可达 QUESTION 62 Which of the following host addresses are members of networks that can be routed across the public Internet? (Choose three.) A. 10.172.13.65 B. 172.16.223.125 C. 172.64.12.29 D. 192.168.23.252 E. 198.234.12.95 F. 212.193.48.254 Answer: CEF Section: Chapter 3: IP Addressing and VLSM 考查公有 IP 地址的范围 10.0.0.0/8-10.255.255.255/8 172.16.0.0/16--172.31.255.255/16 192.168.0.0/24-192.168.255.255/24 除了上面的外都是公有 IP QUESTION 63 Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to network hosts? (Choose three.) A. 15.234.118.63 B. 92.11.178.93 C. 134.178.18.56 D. 192.168.16.87 E. 201.45.116.159 F. 217.63.12.192

Answer: BCD Section: Chapter 3: IP Addressing and VLSM QUESTION 64 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 collision domains. E. They increase the number of broadcast domains while decreasing the size of the broadcast domains. F. They simplify switch administration. Answer: BCE Section: Chapter 10: VLAN 考查 VLAN 的特点 A: 增加冲突域的大小, 错误 B: 允许逻辑划分网段, 正确 C: 增强网络安全, 正确不同 vlan 不能直接通信 D: 当减少冲突域时增加广播域的大小错误 E: 减少广播域的大小时增加了广播域个数正确 F: 简化交换机管理答非所问 QUESTION 65 Which router IOS commands can be used to troubleshoot LAN connectivity problems? (Choose three.) A. ping B. tracert C. ipconfig D. show ip route E. winipcfg F. show interfaces Answer: ADF Section: Chapter 6: IP Routing A: 测试连通性 D: 查看是否有路由 F: 查看接口是否可用 QUESTION 66 Refer to the exhibit. After HostA pings HostB, which entry will be in the ARP cache of HostA to support this transmission?

A. B. C. D. E. F. Answer: D Section: Chapter 2: TCP/IP 此题考查的是 pc 的 arp 表, 不要和包的目的地址源地址弄混了在以太网寻址的时候, 依靠的事 MAC 地址, 每一个网段都需要寻找到自己的下一条 (gateway) 以自己的 MAC 作为 source gateway 的 mac 作为 destination 封装 Frame, 然后将 Frame 转发出去, 但是数据包是不会进行变化的, 也就是 packet 的头部信息不会发生改变所以 IP 包头的 source 和 des 地址是不会变更的

QUESTION 67 Which two topologies are using the correct type of twisted-pair cables? (Choose two.) A. B. C. D. E. Answer: DE Section: Chapter 1: Introduction 线缆问题, 使用双绞线的设备相同设备用 crossover 不同设备用 cut-thought 线缆 console 使用的事 rollor 线缆 QUESTION 68 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 bridge will forward a broadcast but a switch will not. E. Bridges and switches increase the size of a collision domain.

Answer: BC Section: Chapter 9: Switching 考查网桥和交换机的区别 A: 网桥比交换机更快速, 因为他们有更少的端口错误 B: 交换机是一个多端口网桥正确 C: 通过检查数据包的 source mac 学习 mac 地址, 正确 D: 网桥转发广播包, 但交换机不转发错误 E: 网桥和交换机增加冲突域的大小, 错误 QUESTION 69 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. Answer: AD Section: Chapter 1: Introduction A: 可以基于层三的信息过滤数据 B: 广播被淘汰错误 C: 路由器的价格一般比交换机少错误 D: 广播不会穿越路由器, 正确 E: 增加路由器后减少延迟错误 QUESTION 70 Which of the following statements are true regarding bridges and switches? (Choose 3.) 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. Answer: BDF Section: Chapter 9: Switching A: 交换机基于软件, 网桥基于硬件, 错误交换机是基于硬件, 网桥是基于软件 B: 都转发二层广播包, 正确 C: 网桥比交换机快速错误 D: 交换机比网桥具有更多的端口, 正确 E: 网桥定义广播域, 交换机定义冲突域, 错误 F: 基于二层地址转发数据正确 QUESTION 71 Which characteristics are representative of a link-state routing protocol? (Choose three.) A. provides common view of entire topology

B. exchanges routing tables with neighbors C. calculates shortest path D. utilizes event-triggered updates E. utilizes frequent periodic updates Answer: ACD Section: Chapter 6: IP Routing 链路状态路由协议有协议特点? A: 提供查看拓扑的命令, 正确 show ip ospf database B: 邻居之间交换路由信息, 错误交换 LSA C: 计算最短路径, 正确 D: 利用触发更新, 正确 E: 利用周期更新, 错误 QUESTION 72 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. Answer: AF Section: Chapter 1: Introduction 路由器一个端口一个广播域交换机一个端口一个冲突域集线器一个冲突域左边是集线器, 右边是交换机 QUESTION 73 Use the output from the router shown in the graphic above to determine which of the following are correct. (Choose two.)

A. Router John uses a link-state routing protocol. B. Router John will receive routing updates on the Serial0/0 interface. C. Router John will receive routing updates on the Serial0/1 interface. D. Router John will send routing updates out the Serial0/0 interface. E. Router John will send routing updates out the FastEthernet0/0 interface. F. Router John will send routing updates out the Serial0/1 interface. Answer: BD Section: Chapter 6: IP Routing 由图中的地方可知只有 s0/0 发送和接受路由信息 QUESTION 74 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. 255.255.255.0 B. 255.255.255.128 C. 255.255.252.0 D. 255.255.255.224 E. 255.255.255.192 F. 255.255.248.0

Answer: BE Section: Chapter 3: IP Addressing and VLSM 需要至少 300 个子网, 每个子网至少 50 台主机使用一个 B 类地址来划分 A: 最多有 256 个子网, 错误 C: 只有 64 个子网 D: 每个子网只有 30 个可用 IP F: 只有 32 个子网 QUESTION 75 Given the address 192.168.20.19/28, which of the following are valid host addresses on this subnet? (Choose two.) A. 192.168.20.29 B. 192.168.20.16 C. 192.168.20.17 D. 192.168.20.31 E. 192.168.20.0 Answer: AC Section: Chapter 3: IP Addressing and VLSM 192.168.20.19/28 所属网段的范围是 :192.168.20.16-192.168.20.31/28 QUESTION 76 An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21, 23 and 25. What types of packets will be permitted by this ACL? (Choose three.) A. FTP B. Telnet C. SMTP D. DNS E. HTTP F. POP3 Answer: DEF Section: Chapter 2: TCP/IP acl 拒绝了 tcp/udp 21 23 25 这三个端口的流量, 哪些流量会被放行? A:FTP 21 端口 B:TELNET 23 端口 C:SMTP 25 端口 D:DNS 53 端口 E:HTTP 80 端口 F :POP3 110 端口 QUESTION 77 Which are valid modes for a switch port used as a VLAN trunk? (Choose three.) A. transparent B. auto C. on

D. desirable E. blocking F. forwarding Answer: BCD Section: Chapter 10: VLAN 有三种方式建立 trunk 链路 auto on desirable QUESTION 78 OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Choose three.) A. Each OSPF area requires a loopback interface to be configured. B. Areas may be assigned any number from 0 to 65535. C. Area 0 is called the backbone area. D. Hierarchical OSPF networks do not require multiple areas. E. Multiple OSPF areas must connect to area 0. F. Single area OSPF networks must be configured in area 1. Answer: BCE Section: Chapter 6: IP Routing A: 每个区域需要换回口, 错误 B: 区域 ID 的可以设置为 0--65535, 正确 C: 区域 0 是骨干区域, 正确 D: 分层的 OSPF 网络不需要多区域, 错误就是依赖多区域分层 E: 多区域情况必须存在区域 0, 正确 F: 单区域的区域号必须被配置为区域 1, 错误 QUESTION 79 What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two.) A. hello packets B. SAP messages sent by other routers C. LSAs from other routers D. beacons received on point-to-point links E. routing tables received from other link-state routers F. TTL packets from designated routers Answer: AC Section: Chapter 6: IP Routing 链路状态路由协议如何维护拓扑数据库? A:hello 包用于维护邻居关系, 正确 B: 错误, 没有这个概念 C: 通过其他路由器的 LSA, 正确 D: 从点到点链路接收, 错误答案片面 E: 从其他路由器接收路由表, 错误相互间不直接发送路由表 F: 从 DR 接受 TTL 包, 错误, 答非所问

QUESTION 80 Which statements describe the routing protocol OSPF? (Choose three.) A. It supports VLSM. B. It is used to route between autonomous systems. C. It confines network instability to one area of the network. D. It increases routing overhead on the network. E. It allows extensive control of routing updates. F. It is simpler to configure than RIP v2. Answer: ACE Section: Chapter 6: IP Routing A: 支持 VLSM, 正确 B: 在 AS 之间使用, 错误在 AS 内部使用 C: 限制了不稳定网络的范围, 正确通过划分区域实现 D: 增加了网络的开销, 错误 E: 允许路由更新控制, 正确 F: 比 RIPv2 更容易配置, 错误, 答非所问 QUESTION 81 The switches shown in the diagram, Core and Core2, are both Catalyst 2950s. The addressing scheme for each company site is as follows: Router Ethernet port - 1st usable address Core - 2nd usable address Core2-3rd usable address For this network, which of the following commands must be configured on Core2 to allow it to be managed remotely from any subnet on the network? (Choose three.) A. Core2(config)# interface f0/0 Core2(config-if)# ip address 192.168.1.10 255.255.255.248 B. Core2(config)# interface vlan 1 Core2(config-if)# ip address 192.168.1.11 255.255.255.248 C. Core2(config)# line con 0 Core2(config-line)# password cisco D. Core2(config)# line vty 0 4 Core2(config-line)# password cisco E. Core2(config)# ip default-gateway 192.168.1.9 F. Core2(config)# ip route 0.0.0.0 0.0.0.0 192.168.1.8 Answer: BDE Section: Chapter 10: VLAN

实现远程管理, 需要给交换机配置管理 IP, 需要路由可达 B: 配置管理 IP 2 层交换机只能在 vlan 中配置 IP D: 配置 vty 密码 E: 配置缺省网关 QUESTION 82 An administrator is unsuccessful in adding VLAN 50 to a switch. While troubleshooting the problem, the administrator views the output of the show vtp status command, which is displayed in the graphic. What commands must be issued on this switch to add VLAN 50 to the database? (Choose two.) A. Switch(config-if)# switchport access vlan 50 B. Switch(vlan)# vtp server C. Switch(config)# config-revision 20 D. Switch(config)# vlan 50 name Tech E. Switch(vlan)# vlan 50 F. Switch(vlan)# switchport trunk vlan 50 Answer: BE Section: Chapter 10: VLAN 无法在交换机上添加 vlan50 的原因? 从图中画红线地方可以看出交换机处于 client 模式, 无法增加, 删除, 修改 vlan 题目说在 database 中增加, 所以选 BE QUESTION 83 Which of the following IP addresses fall into the CIDR block of 115.64.4.0/22? (Choose three.) A. 115.64.8.32 B. 115.64.7.64 C. 115.64.6.255 D. 115.64.3.255 E. 115.64.5.128 F. 115.64.12.128 Answer: BCE Section: Chapter 3: IP Addressing and VLSM 115.64.4.0/22 的范围是 115.64.4.0/22--115.64.7.255/22 QUESTION 84

Which of the following are types of flow control? (Choose three.) A. buffering B. cut-through C. windowing D. congestion avoidance E. load balancing Answer: ACD Section: Chapter 2: TCP/IP 流控制有哪些? A: 缓存 B: 直通 C: 窗口机制 D: 拥塞避免 E: 负载均衡 QUESTION 85 Which destination addresses will be used by Host A to send data to Host C? (Choose two.) A. the IP address of Switch 1 B. the MAC address of Switch 1 C. the IP address of Host C D. the MAC address of Host C E. the IP address of the router's E0 interface F. the MAC address of the router's E0 interface Answer: CF Section: Chapter 6: IP Routing 数据包在转发的过程中, 源目 IP 不变, 源目 MAC 会变化目的地不在同一个网段, 数据先发送到网关 QUESTION 86 What can be determined from the line of show ip route output shown in the exhibit? (Choose two.)

A. The next routing update can be expected in 35 seconds. B. The IP address 10.10.10.6 is configured on S0/1. C. The IP address 10.10.10.8 is configured on S0/1. D. This route is using the default administrative distance. E. The 10.10.10.8 network is two hops away from this router. Answer: DE Section: Chapter 6: IP Routing 考点 : 考查 RIP 的路由条目通过 RIP 学习到一条到达 10.10.10.8 的路由, 下一跳是 10.10.10.6, 出接口是 s/1 A: 错误 rip 更新周期为 30s, 正常计时器不会超过 30 B: 错误, 这个 ip 是对端接口 ip C: 错误 s0/1 的 ip 无法得知 D: 正确,rip 缺省的管理距离是 120 E: 正确 QUESTION 87 Refer to the exhibit. All of the routers in the network are configured with the ip subnet-zero command. Which network addresses should be used for Link A and Network A? (Choose two.) A. Network A - 172.16.3.48/26 B. Network A - 172.16.3.128/25 C. Network A - 172.16.3.192/26 D. Link A - 172.16.3.0/30 E. Link A - 172.16.3.40/30 F. Link A - 172.16.3.112/30 Answer: BD Section: Chapter 3: IP Addressing and VLSM 配置了 ip subnet-zero, 可以使用全 0 网段 A: 错误,120 台主机, 主机位至少为 7 位

B: 正确, 主机位 32-25=7 C: 错误, 主机位少于 7 位 D: 正确因为使用了 ip subnet-zero E: 错误, 包含在 172.16.3.32/27 网段中 F: 错误, 包换在 172.16.3.96/27 网段中 QUESTION 88 Which two subnetworks would be included in the summarized address of 172.31.80.0 /20? (Choose two.) A. 172.31.17.4 /30 B. 172.31.51.16 /30 C. 172.31.64.0 /18 D. 172.31.80.0 /22 E. 172.31.92.0 /22 F. 172.31.192.0 /18 Answer: DE Section: Chapter 3: IP Addressing and VLSM 考点 : 考查 VLSM 知识点 172.31.80.0/20 网段所在的范围是 172.31.80.0--172.31.95.255/20 D/E 都在这个范围内 QUESTION 89 The network administrator has discovered that the power supply has failed on a switch in the company LAN and that the switch has stopped functioning. It has been replaced with a Cisco Catalyst 2950 series switch. What must be done to ensure that this new switch becomes the root bridge on the network? A. Lower the bridge priority number. B. Change the MAC address of the switch. C. Increase the VTP revision number for the domain. D. Lower the root path cost on the switch ports. E. Assign the switch an IP address with the lowest value. Answer: A Section: Chapter 9: Switching 考点 :STP 的选举原则 RID= 优先级 +mac 地址小者优先 QUESTION 90 Refer to the exhibit. Assume that all of the router interfaces are operational and configured correctly. How will router R2 be affected by the configuration of R1 that is shown in the exhibit?

A. Router R2 will not form a neighbor relationship with R1. B. Router R2 will obtain a full routing table, including a default route, from R1. C. R2 will obtain OSPF updates from R1, but will not obtain a default route from R1. D. R2 will not have a route for the directly connected serial network, but all other directly connected networks will be present, as well as the two Ethernet networks connected to R1. Answer: B Section: Chapter 6: IP Routing 考查 OSPF 产生默认路由的条件虽然默认路由出口错误但是邻居仍然回收到正确答案选 :B QUESTION 91 Which three IP addresses can be assigned to hosts if the subnet mask is /27 and subnet zero is usable? (Choose three.) A. 10.15.32.17 B. 17.15.66.128 C. 66.55.128.1 D. 135.1.64.34 E. 129.33.192.192 F. 192.168.5.63 Answer: ACD Section: Chapter 3: IP Addressing and VLSM 掩码为 27, 所以一个子网可以有 32 个 IP, 可用的 30 个 A:10.15.32.0-31/27, 正确 B:17.15.66.128-159/27, 错误,17.15.66.128 刚好是网络号 C:66.55.128.0-31/27, 正确 D:135.1.64.32-63/27, 正确 E: 刚好是网络号, 错误 F: 刚好是广播地址, 错误 QUESTION 92 Refer to the exhibit. A packet with a source IP address of 192.168.2.4 and a destination IP address of 10.1.1.4 arrives at the HokesB router. What action does the router take?

A. forwards the received packet out the Serial0/0 interface B. forwards a packet containing an EIGRP advertisement out the Serial0/1 interface C. forwards a packet containing an ICMP message out the FastEthernet0/0 interface D. forwards a packet containing an ARP request out the FastEthernet0/1 interface Answer: C Section: Chapter 6: IP Routing 路由器中没有去往目的地的路由, 返回一个 ICMP 报错报文去往源 IP 的路由下一跳是 f0/0, 所以选 C QUESTION 93 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. Based 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: D Section: Chapter 6: IP Routing QUESTION 94 What are three characteristics of the OSPF routing protocol? (Choose three.) A. It converges quickly. B. OSPF is a classful routing protocol. C. It uses cost to determine the best route. D. It uses the DUAL algorithm to determine the best route. E. OSPF routers send the complete routing table to all directly attached routers. F. OSPF routers discover neighbors before exchanging routing information. Answer: ACF Section: Chapter 6: IP Routing

考查 OSPF 特性 A: 收敛快, 正确 B: 有类路由, 错误 C: 使用 cost 值确定最优路由, 正确 D: 使用 dual 算法, 错误, 这个是 EIGRP 的算法 E: 发送全部路由信息, 错误, 增量更新 F: 在交换信息之前先建立邻接关系, 正确 QUESTION 95 Refer to the exhibit. SW1 and SW2 have default configurations. What will happen if host 1 sends a broadcast? A. Hosts 2, 3, and 4 will receive the broadcast. B. Hosts 1, 2, 3, and 4 will receive the broadcast. C. Host 2 and the Fa0/0 interface of R1 will receive the broadcast. D. Hosts 1, 2 and the Fa0/0 interface of R1 will receive the broadcast. E. Hosts 1, 2, 3, 4 and interface Fa0/0 of R1 will receive the broadcast. F. Hosts 2, 3, 4, and interfaces Fa0/0 and Fa0/1 of R1 will receive the broadcast. Answer: C Section: Chapter 6: IP Routing 考查路由器的功能 : 隔离广播域, 一个端口一个广播域综上所述, 选 C QUESTION 96 A router has learned three possible routes that could be used to reach a destination network. One route is from EIGRP and has a composite metric of 20514560. Another route is from OSPF with a metric of 782. The last is from RIPv2 and has a metric of 4. Which route or routes will the router install in the routing table? A. the OSPF route B. the EIGRP route C. the RIPv2 route D. all three routes E. the OSPF and RIPv2 routes Answer: B

Section: Chapter 6: IP Routing 考点 : 考查路由条目进入路由表的原则 : 最优路由才能进入去往同一目的的多条路由, 先比较 AD 值,AD 值小者优先 ;AD 值一直则比较 metric 值 AD 值 : EIGRP 90 OSPF 110 RIP 120 QUESTION 97 For what two purposes does the Ethernet protocol use physical addresses? (Choose two.) A. to uniquely identify devices at Layer 2 B. to allow communication with devices on a different network C. to differentiate a Layer 2 frame from a Layer 3 packet D. to establish a priority system to determine which device gets to transmit first E. to allow communication between different devices on the same network F. to allow detection of a remote device when its physical address is unknown Answer: AE Section: Chapter 1: Introduction 考点 : 考查 mac 地址的作用 A: 在二层唯一确定一台设备, 正确 B: 是设备在不同的网络中通信, 错误, 不同网络通信需要通过 IP 地址确定 C: 区别二层和三层帧, 错误 D: 确定设备的优先级, 错误没有这个功能 E: 是同一网络的不同设备可以通信, 正确 F: 当不知道远程设备的物理地址时可以查询, 错误不能跨网段 QUESTION 98 As a frame leaves a Layer 3 device, the Layer 2 encapsulation information is changed from what it was when it entered the device. For what two reasons can this happen? (Choose two.) A. The data is moving from 10BASE-TX to 100BASE-TX. B. The WAN encapsulation type has changed. C. The data format has changed from analog to digital. D. The source and destination hosts are in the same subnet. E. The source and destination MAC addresses have changed. Answer: BE Section: Chapter 14: Wide Area Network (WAN) 考点 : 数据包转发过程当数据包离开三层设备时, 二层封装哪些信息改变了 A: 从 10M 网络到 100M 网络, 错误带宽改变不会改变数据包封装 B: 广域网封装改变, 正确如从 HDCL 变成 PPP C: 数据格式从模拟型号变成数据信号, 错误, 物理层的信号方式变化不会影响二层数据格式 D: 错误 E: 原蜜 MAC 改变, 正确 QUESTION 99 Which two statements are true regarding EIGRP? (Choose two.)

A. Passive routes are in the process of being calculated by DUAL. B. EIGRP supports VLSM, route summarization, and routing update authentication. C. EIGRP exchanges full routing table information with neighboring routers with every update. D. If the feasible successor has a higher advertised distance than the successor route, it becomes the primary route. E. A query process is used to discover a replacement for a failed route if a feasible successor is not identified from the current routing information. Answer: BE Section: Chapter 6: IP Routing A: 被动路由在路由进程中由 dual 计算, 错误 B: 至此 VLSM, 路由汇总, 认证, 正确 C: 每次更新都发送全部的路由信息, 错误, 增量更新 D: 如果可行后继路由器有一个比后继路由器高的通告距离, 它会成为主路由条目, 错误 E: 如果不存在 FS, 使用查询进程去发现替代失效的路由信息, 正确 QUESTION 100 Refer to the exhibit. In the communication between host 1 and host 2 over the point-to-point WAN, which protocol or technology is represented by dashed line A? A. IP B. T1 C. PPP D. IEEE 802.3 Answer: A Section: Chapter 14: Wide Area Network (WAN) A: 主机之间的通信依靠 IP 确定对方地址 B:T1, 广域网线路的一种 C:PPP, 二层封装的一种 D:ieee 802.3 以太网封装 QUESTION 101 Refer to the exhibit. The switch in the graphic has a default configuration and the MAC table is fully populated. In addition, this network is operating properly. The graphic represents selected header

information in a frame leaving host A. What can be concluded from this information? A. The MAC address of host A is FFFF.FFFF.FFFF. B. The router will forward the packet in this frame to the Internet. C. The switch will only forward this frame to the attached router interface. D. All devices in this LAN except host A will pass the packet to Layer 3. Answer: D Section: Chapter 9: Switching QUESTION 102 What is an appropriate use of a default route? A. to provide routing to a local web server B. to provide routing from an ISP to a stub network C. to provide routing that will override the configured dynamic routing protocol D. to provide routing to a destination that is not specified in the routing table and which is outside the local network Answer: D Section: Chapter 6: IP Routing 考点 : 考查缺省路由的特点 A: 提供路由到本地 web 服务器, 错误 B: 提供从 ISP 到末节网络的路由, 错误 C: 提供优先于动态路由协议的路由, 错误根据最长匹配原则, 缺省路由最后才匹配 D: 正确 QUESTION 103 Refer to the exhibit. A junior network engineer has prepared the exhibited configuration 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: BE Section: Chapter 8: NAT DMZ 使用公网地址, 不需要做 NAT, 图中 ACL 第二条错将 DMZ 做了 NAT, 因此造成不能访问 QUESTION 104 Refer to the exhibit. Two routers have just been configured by a new technician. All interfaces are up. However, the routers are not sharing their routing tables. What is the problem? A. Split horizon is preventing Router2 from receiving routing information from Router1. B. Router1 is configured for RIP version 2, and Router2 is configured for RIP version 1.

C. Router1 has an ACL that is blocking RIP version 2. D. There is a physical connectivity problem between Router1 and Router2. E. Router1 is using authentication and Router2 is not. Answer: B Section: Chapter 6: IP Routing 考点 : 考查 RIP 版本知识点两种版本不兼容由提示信息可知 R2 发送 V1, 收到 V2 A: 水平分割保护 R2 从 R1 接收路由信息错误 B:R2 配置为 V2,R2 配置为 V1, 正确 C:R1 使用了 acl 拒绝了 rip 的 V2 D:R1 和 R2 之间的物理链路有问题错误 E:R1 使用了认证,R2 没有错误 QUESTION 105 A medium-sized company has a Class C IP address. It has two Cisco routers and one non-cisco router. All three routers are using RIP version 1. The company network is using the block of 198.133.219.0/24. The company has decided it would be a good idea to split the network into three smaller subnets and create the option of conserving addresses with VLSM. What is the best course of action if the company wants to have 40 hosts in each of the three subnets? A. Convert all the routers to EIGRP and use 198.133.219.32/27, 198.133.219.64/27, and 198.133.219.92/27 as the new subnetworks. B. Maintain the use of RIP version 1 and use 198.133.219.32/27, 198.133.219.64/27, and 133.219.92/27 as the new subnetworks. C. Convert all the routers to EIGRP and use 198.133.219.64/26, 198.133.219.128/26, and 133.219.192/26 as the new subnetworks. D. Convert all the routers to RIP version 2 and use 198.133.219.64/26, 198.133.219.128/26, and 133.219.192/26 as the new subnetworks. E. Convert all the routers to OSPF and use 198.133.219.16/28, 198.133.219.32/28, and 198.133.219.48/28 as the new subnetworks. F. Convert all the routers to static routes and use 198.133.219.16/28, 198.133.219.32/28, and Answer: D Section: Chapter 6: IP Routing QUESTION 106 Refer to the exhibit. Why has this switch not been elected the root bridge for VLAN1?

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