CCNA考试题库中英文翻译版及答案12

 28. Refer to the exhibit. Switch-1 needs to send data to a host with a MAC address of  00b0.d056.efa4. What will do with this data?
　　28.根据下图，Switch-1需要往一台MAC地址为00b0.d056.efa4的主机发数据，Switch-1会如何处理这些数据?

　　



　　A. Switch-1 will drop the data because it does not have an entry for that MAC address.

　　A. Switch-1会丢弃该数据，因为它没有该MAC地址条目

　　B. Switch-1 will flood the data out all of its ports except the port from which the data originated.

　　B.Switch-1会防洪该数据到所有的接口，除了该数据的源接口

        C. Switch-1 will send an ARP request out all its ports except the port from which the data originated.

　　C.Switch-1会发送ARP请求到所有的接口，除了该数据的源接口

　　D. Switch-1 will forward the data to its default gateway.

　　D.Switch-1会往默认网关发送该数据

　　Answer: B

　　

29. In the implementation of VLSM techniques on a network using a single Class C IP address,which subnet mask is the most efficient for point-to-point serial links?

　　29.在使用VLSM技术的网络中使用一个C类的IP地址，以下哪个子网掩码在点对点串行链路中是最不浪费地址空间的?

　　A. 255.255.255.0　　B. 255.255.255.240

　　C. 255.255.255.248　　D. 255.255.255.252　　E. 255.255.255.254

　　Answer: D