Ethernet History Deepdive – Why Do We Have Different Frame Types? (lostintransit.se)In the early 70’s, Robert Metcalfe, inspired by ARPANET and ALOHAnet had been working on developing what we today know as Ethernet. He published a paper in 1976, together with David Boggs, named Ethernet: Distributed Packet Switching for Local Computer Networks:
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Intrusive rock (Wikipedia)Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form intrusions, such as batholiths, dikes, sills, laccoliths, and volcanic necks.