Refer to the topology and router configuration shown in the graphic． A host on the LAN is accessing an FTP server across the Int

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问题 Refer to the topology and router configuration shown in the graphic． A host on the LAN is accessing an FTP server across the Internet． Which of the following addresses could appear as a source address for the packets forwarded by the router to the destination server?

选项 A、10．10．0．1
B、10．10．0．2
C、199．99．9．33
D、199．99．9．57
E、200．2．2．17

答案D

解析这是个NAT地址转换的题目，在这f0/0接口连接下的为私有的地址，这些地址是不能同外网进行通讯的，这时就借助NAT，将内网的私有地址转换为可以在公网上通讯的地址，我们看到NAT POOL 中定义的转换后的公有地址为199．99．9．40到199．99．9．62，则表示这段地址是我转换后的内网全局地址，所以HOST想要穿过INTERNET访问FTP服务器，则需要转换为公有地址199．99．9．40到199．99．9．62之内的地址，在上面的答案中只有地址199．99．9．57满足条件，所以答案就是D了。

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