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...Outline circuit vs packet switching layered tasks internet protocol suites iso s osi model end to communication direct most basic form of tx rx gnd serial port is performed over the comm app viewpoint two network applications should interact as if they were directly connected write read a b but what going on underneath inside cloud dedicated circuits telephone switches establish for data are put into packets each stamped with switch source and destination addresses routers know where forward router computer networks complex systems involve varieties hardware software components protocols networking task divided several subtasks or layers...