Reliable data transfer question:

Suppose that the alternating-bit protocol (rdt 3.0) is used to provide reliable data transfer between a sender and receiver. The application on the sender side has three packets to send. After sending the second packet, the receiver sends an acknowledgment that gets corrupted by the channel. After sending the third packet, the receiver sends an acknowledgment that is lost by the channel.

(a) Draw a timing diagram to show how the protocol recovers from the effect of the channel impairments in the above scenario and is able to deliver the three packets reliably.

(b) Suppose the capacity of the channel is 100 Mbps and each packet is 5 KBytes long, including both header fields and data. Assume the one-way delay between sender and receiver is 10 ms. Calculate the effective throughput of the protocol. Briefly explain how the protocol could be modified to increase throughput.