凡是从其他网络发送给本单位某个主机的IP数据报，仍然是根据IP数据报的

Any IP datagram sent from another network to a certain host in this unit still finds the router connected to the unit’s network according to the destination network number of the IP datagram. However, after the router receives the IP datagram, it finds the destination subnet according to the destination network number and subnet number, and delivers the IP datagram to the destination host.

Any IP data report sent from other networks to a host of the unit is still based on the IP data report's purpose network number to find the router connected to the unit network. However, after receiving the IP data report, the router finds the destination subnet according to the destination network number and subnet number and delivers the IP data report to the destination host.

All IP datagrams sent from other networks to a host of the unit still find the router connected to the network of the unit according to the destination network number of the IP datagram. But after receiving the IP datagram, the router finds the destination subnet according to the destination network number and subnet number, and delivers the IP datagram to the destination host.<br>