61) Which of the following access control methods is probabilistic

62) In stop-and-wait ARQ, if data 1 has an error, then receiver sends which frame

63) In which communication, poll/select method used to determine control of the line ?

64) The secondary device in a multipoint configuration sends data in response to which of the following event

65) Which of the following decides the role (sender or receiver) of a device on a network ?