Back in the day the network layer was not standardised nor interoperable. The "International Network Working Group" provided a communication protocol (TCP/IP) capable of hiding the differences of the different networks.
> the job of the TCP is merely to take a stream of messages produced by one HOST and reproduce the stream at a foreign receiving HOST without change. [Cerf]
That network of networks demonstrated the feasibility of the concept of interconnection. The resulting net eventually became the global inter-network... INTERNET
Back in the day the network layer was not standardised nor interoperable. The "International Network Working Group" provided a communication protocol (TCP/IP) capable of hiding the differences of the different networks.
> the job of the TCP is merely to take a stream of messages produced by one HOST and reproduce the stream at a foreign receiving HOST without change. [Cerf]
That network of networks demonstrated the feasibility of the concept of interconnection. The resulting net eventually became the global inter-network... INTERNET