What part of the network is the point where the responsibility of the administrator ends and the telecommunications providers responsibility begins

"PAD interface " is the correct answer.

Explanation:

PAD seems to be a concept most commonly linked with such an X.25 interface, where even the PAD splits the shared information into individual packets as well as configurations asynchronous distribution including its header information.The interface pad should be used for scrubbing polished surface areas and contour lines, in conjunction with handle abrasive particles. Use the pad GUI would also give a smoother performance. The control pad is located between some of the scrubbing disc as well as the backing pad.

Cuz maybe it is inappropriate