CCNA考试题库中英文翻译版及答案7

 16. Refer to the exhibit. What is the most efficient summarization that R1 can use to advertise its networks to R2?

　　16.根据下图，R1能通告给R2的最有效的汇总是?

　　

　　A. 172.1.0.0/22　　B. 172.1.0.0/21

　　C. 172.1.4.0/22

　　D. 172.1.4.0/24　　172.1.5.0/24

　　172.1.6.0/24　　172.1.7.0/24

　　E. 172.1.4.0/25　　172.1.4.128/25

　　172.1.5.0/24　　172.1.6.0/24

　　172.1.7.0/24

　　Answer: C

 

17. Which spread spectrum technology does the 802.11b standard define for operation?

　　17.哪种扩频技术是802.11B定义使用的

　　A. IR　　B. DSSS　　C. FHSS　　D. DSSS and FHSS

　　E. IR, FHSS, and DSSS

　　Answer: B

 

18. Refer to the exhibit. Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2?

18.根据下图，假设所有路由器接口都配置正确且正常工作，假设R2上OSPF配置正确，配置在R1上默认路由会怎么影响R2的工作

 

       A. Any packet destined for a network that is not directly connected to router R1 will be dropped.

　　A.任何到达一个和路由器R1非直连的网络的数据包都会被丢弃

　　B. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately.

　　B.任何到达一个和路由器R2非直连的网络的数据包都会被丢弃

　　C. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1.

　　C.任何到达一个和路由器R2非直连的网络的数据包都会即时被丢弃，因为R1上缺少网关

　　D. The networks directly connected to router R2 will not be able to communicate with the 172.16.100.0, 172.16.100.128, and 172.16.100.64 subnetworks.

　　D. 直连在 R2 上的网络将不能够和 172.16.100.0, 172.16.100.128, 172.16.100.64 这些子网通讯

　　E. Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur.

　　E.任何目的地没有在R2的路由表中的数据包,R2将会定向到R1,R1会发送哪个数据包到R2,这样路由环路产生

　　Answer: E