Cisco 640-802 Cisco Certified Network Associate (CCNA) Q&A V 14 (252Q&A) 中国CCIE实验室翻译小组翻译原创作品中国CCIE实验室翻译小组第一次作品，发现BUG请及时反馈修正本次翻译成员名单：土狼, 无泪路由, lancy 小企鹅 等等.对我们的工作支持和帮助的中国CCIE实验的所有的老师表示感谢!持奥运,祝工作在奥运前线的网络工程师们身体健康,工作顺利,合家欢乐！ 中国CCIE实验室www.chinaccielab.net1. What are two reasons that a network administrator would use access lists? (Choose two.) 1.出于哪两种理由，网络管理员会使用访问列表？A. to control vty access into a router A.控制通过VTY访问路由器B. to control broadcast traffic through a router B.控制广播流量穿越路由器C. to filter traffic as it passes through a router C.过滤穿越路由器的流量D. to filter traffic that originates from the router 过滤源自路由器的流量E. to replace passwords as a line of defense against security incursions 用来重置密码以防御攻击Answer: AC 2. A default Frame Relay WAN is classified as what type of physical network? 2.一个默认的帧中继WAN被分类为哪种物理网络类型？A. point-to-point A.点到点B. broadcast multi-access B.广播多路访问C. nonbroadcast multi-access C.非广播多路访问D. nonbroadcast multipoint D.非广播多点E. broadcast point-to-multipoint E.广播点到多点Answer: C 3. A single 802.11g access point has been configured and installed in the center of a square office. A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency. What are three likely causes of this problem? (Choose three.) 3.一个802.11 接入点被部署在一个方形办公室的中央，当大多数用户在大流量传输数据时，一些无线用户发现无线网络变得缓慢和出现丢包A. mismatched TKIP encryption B. null SSID C. cordless phones D. mismatched SSID E. metal file cabinets F. antenna type or direction Answer: CEF 4. Refer to the exhibit. How many broadcast domains exist in the exhibited topology? 根据下图，图中的拓扑中存在多少个广播域？A. one A.1 B. two B.2 C. three C.3 D. four D.4 E. five E.5 F. six F.6 Answer: C 5. Refer to the exhibit. What two facts can be determined from the WLAN diagram? (Choose two.) 5.根据下图，WLAN diagram 决定了哪两个事实A. The area of overlap of the two cells represents a basic service set (BSS). A. 两个 cells的overlap的区域描述了一个basic service set B. The network diagram represents an extended service set (ESS). B. 网络描述了一个extended service set C. Access points in each cell must be configured to use channel 1. C. 再每个CELL中的AP必须被配置成使用channel 1 D. The area of overlap must be less than 10% of the area to ensure connectivity. D. 为了确保连通性,重叠区域必须小于10% E. The two APs should be configured to operate on different channels. E. 两个访问点应该被配置成工作在不同的频道 Answer: BE 6. The command frame-relay map ip 10.121.16.8 102broadcast was entered on the router. Which of the following statements is true concerning this command? 6.路由器上输入命令frame-relay map ip 10.121.16.8 102 broadcast，以下选项正确的是？A. This command should be executed from the global configuration mode. A.该命令应该在全局配置模式下被执行B. The IP address 10.121.16.8 is the local router port used to forward data. B.IP地址10.121.16.8 是本地路由器用来转发数据的接口C. 102 is the remote DLCI that will receive the information. C.102是远端的DLCI它将接受信息。D. This command is required for all Frame Relay configurations. D.这个命令要求被配置为所有的帧中继配置。E. The broadcast option allows packets, such as RIP updates, to be forwarded across the PVC. E.这个广播选项允许数据包，例如rip更新信息，将会被转发通过PVC. Answer: E 7. Which type of attack is characterized by a flood of packets that are requesting a TCP connection to a server? 7.哪种类型的攻击的特点是发大量的TCP请求连接数据包到服务器？A. denial of service A.拒绝服务B. brute force B.强制叠加C. reconnaissance C.监听D. Trojan horse D.木马Answer: A 8. Which of the following are associated with the application layer of the OSI model? (Choose two.) 8.以下两个选项是工作在OSI模型的应用层的？A. ping B. Telnet C. FTP D. TCP E. IP Answer: BC 9. Refer to the exhibit. The network administrator has created a new VLAN on Switch1 and added host C and host D. The administrator has properly configured switch interfaces FastEthernet0/13 through FastEthernet0/24 to be members of the new VLAN. However, after the network administrator completed the configuration, host A could communicate with host B, but host A could not communicate with host C or host D. Which commands are required to resolve this problem? 9.网络管理员在交换机1上创建一个新VLAN并且将主机C和主机D加入到此VLAN 中.管理员配置交换机接口FastEthernet0/13 到FastEthernet0/24 成为新VLAN成员.但是网络管理员完成配置以后,主机A可以和主机B通信,但是主机A不能和主机C或者主机D通信. 哪个命令可以用来解决这个问题A. Router(config)# interface fastethernet 0/1.3 Router(config-if)# encapsulation dot1q 3 Router(config-if)# ip address 192.168.3.1 255.255.255.0 B. Router(config)# router rip Router(config-router)# network 192.168.1.0 Router(config-router)# network 192.168.2.0 Router(config-router)# network 192.168.3.0 C. Switch1# vlan database Switch1(vlan)# vtp v2-mode Switch1(vlan)# vtp domain cisco Switch1(vlan)# vtp server D. Switch1(config)# interface fastethernet 0/1 Switch1(config-if)# switchport mode trunk Switch1(config-if)# switchport trunk encapsulation isl Answer: A 10. For security reasons, the network administrator needs to prevent pings into the co