Question

which is the first known network of the world​

Answer 1

Answer:

Advanced Research Projects Agency Network

The ARPANET (an acronym for Advanced Research Projects Agency Network) was the first wide-area packet-switching network with distributed control and one of the first networks to implement the TCP/IP protocol suite.

Answer 2

$\tt\blue{Advanced\:Research}$

$\tt\blue{Projects\:Agency}$

$\tt\blue{Network}$