Question: a ) Suppose the router R 1 sends an acknowledgment to S if a packet successfully arrives. Similarly, D sends an acknowledgement to R 2

a)Suppose the router R1 sends an acknowledgment to S if a packet successfully arrives. Similarly, D sends an acknowledgement to R2 if a packet successfully arrives. S and R2 retransmit the packets only if no acknowledgment is received. There are no acknowledgements between R1 and R2. Assume acknowledgments are always successfully delivered. What is the likelihood that the source, S, must transmit a packet more than four times for this case?

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