1. Refer to the exhibit. What is the purpose of the configuration that is shown?
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A. to translate addresses of hosts on the fa0/0 and fa0/1 networks to a single public IP address for Internet access
B. to translate the internal address of each host on fa0/0 and fa0/1 to a unique external IP address for Internet acces
C. to provide security on fa0/0 and fa0/1 through the application of an access list
D. to allow IP hosts on the Internet to initiate TCP/IP connections to hosts on fa0/0 and fa0/1
Answer: A
解释一下:因为Ineternal Router 的f0/0 和f0/1的接口连接的网络所使用的都是私有地IP地址,为了能让这些网络能和外网通讯,就需要把这些地址转换为可以与外部通讯的公有地址,因此在这些接口做了一个NAT的地址转换,将f0/0 和f0/1的网络的地址都转换为s0/0的地址,而s0/0的地址是公有的地址,这样拥有私有地址的网络也可以和外部进行通讯了
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