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 ?

66) For stop-and-wait flow control, for n data packets sent, how many acknowledgements are needed ?

67) The collision domain of traditional Ethernet and Fast Ethernet respectively are

68) In a crossbar with 1000 crosspoints, how many statistically are in use at any time