You have studied the Stop-and-Wait protocol between one sender and one receiver.

Now consider a Stop-and-Wait protocol between one sender and n receivers, where n

1 where a single channel is used for communication between the sender and the

receivers. The sender needs 1ms to transmit each frame. The protocol allows the

receivers to acknowledge in a round robin fashion where the first node acknowledges

immediately after receiving the complete frame. For others, a node sends ACK

immediately after the preceding node completes sending its ACK. Assume a

propagation delay of 0 in each direction. Each ACK takes 0.5ms to be transmitted.

The sender transmits again after the last ACK is received and repeats the same

procedure. Each node is equipped with a half-duplex radio.

(a) What is the time interval between 2 transmissions at the sender?

(b) What is the channel utilization at the sender?

(c) If each radio is full-duplex, what change will you make for this Stop-and-Wait

protocol between one sender and n receivers?