思科认证考试题库
63页1、CCNA640-802 V13题库试题分析题库试题分析题库讲解题库讲解:吴老师(艾迪飞CCIE实验室首发网站:首发网站:http:/1. What are two reasons that a network administrator would use access lists? (Choose two.) A. to control vty access into a router B. to control broadcast traffic through a router C. to filter traffic as it passes through a router D. to filter traffic that originates from the router E. to replace passwords as a line of defense against security incursions Answer: AC解释一下:在VTY线路下应用ACL,可以控制从VTY线路进来的telnet的流量。也可以过滤穿越一台路由器的流量。2. A defaul
2、t Frame Relay WAN is classified as what type of physical network? A. point-to-point B. broadcast multi-access C. nonbroadcast multi-access D. nonbroadcast multipoint E. broadcast point-to-multipoint Answer: C解释一下:在默认的情况下,帧中继为非广播多路访问链路。但是也可以通过子接口来修 改他的网络的类型。3Refer to the exhibit. How many broadcast domains exist in the exhibited topology?A. one B. two C. three D. four E. five F. six Answer: C解释一下:广播域的问题,在默认的情况下,每个交换机是不能隔离广播域的,所以在同 一个区域的所有交换机都在同一个广播域中,但是为了减少广播的危害,将广播限制在一 个更小的范围,有了VLAN的概念,VLAN表示的是一
3、个虚拟的局域网,而他的作用就是隔离广播。所以被VLAN隔离了的每个区域都表示一个单独的广播域,这样一个VLAN中 的广播的流量是不能传到其他的区域的,所以在上题中就有3个广播域了。4. 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.) A. mismatched TKIP encryption B. null SSID C. cordless phones D. mismatched SSID E. metal file cabinets F. antenna type or directio
4、n Answer: CEF 6. 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. This command is required for all Frame Relay configurations. E. The broadcast option allows packets, such as RIP updates
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