It is the network which connects broad (an internet) with plural computer networks mutually. Narrow sense (The Internet and The Net) with, among broad Internet, it is naming the network which especially is mutually connected internationally widely on a very big scale. At present for unique, it is handled as proper name. Internet 2 (Internet2) with broad Internet (an internet) it belongs for the present. Internet 2 is the network for experiment which connects the American central institution & the university etc. mutually, you say generally, "Internet" it is not mutually connected.
When, "Internet" generally, Internet of narrow sense (The Internet) it points. Making large and various computer networks connect mutually, international telecommunication network is constructed. In communication protocol various protocol were used in first stage, but IP whose availability is high with afterwards (internet protocol) it was adopted entire as standard protocol, it reached the point where it spreads world and even generally.
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