80) For a sliding window of size n-1 (n sequence numbers), there can be maximum of how many frames sent but unacknowledged ?

81) Select incorrect statement in error retransmission used in continuous ARQ method.

82) Collision domain can be compared to which distance data travels between two stations

83) How many cross points are needed in a single-stage switch with 40 inputs and 50 outputs ?

84) In a time - division switch, which governs the destination of a packet stored in RAM