76) Television channels are 6 MHz. How many bits can be sent if four level digital signals are used (assume a noiseless channel)

77) What is the maximum burst length on an 155.52 Mbps ATM ABR connection whose PCR value 200,000 and whose L value is 25 msec ?

78) Poll/select line discipline requires what to identify the packet recipient

79) In sliding window flow control, if window size is 63, what is the range of sequence numbers ?

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