[简答题]NAT中inside local和inside global之间的关系并描述其作用。

参考答案: The inside network require legitimate IP address to access Internet， and inside local address of the inside network is translated to inside global address which is legitimate in order to communicate with outside network.
Inside local address—The IP address that is assigned to a host on the inside network. The address is probably not a legitimate IP address.
Inside global address—A legitimate IP address （assigned by the NIC or service provider） that represents one or more inside local IP addresses to the outside world.