1. The actual computer network is a complex, physical device by using the IP protocol, the physical differences between the shield network, when the network hosts using IP protocol, without concern for the details of the network.
2.IP actual network protocol that complex into a virtual interconnected networks, IP protocol so that the underlying details of the network layer may be shielded and focused data forwarding network layer, and solves reporting the data in the virtual network
The problem of the transmission path.