单项选择题 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（）。

单项选择题 Refer to the exhibit. What command sequence will enable PAT from the inside to outside network?（）

单项选择题 在配置华为路由器和思科路由器搭建的帧中继网络时，你应该怎样配置华为路由器的链路封装格式？（假定思科采用默认封装格式）（）