Question: Computer Networks: Suppose two stations (source and destination) are connected using the stop-and-wait protocol . The source has infinite number of messages to send. The

Computer Networks:

Suppose two stations (source and destination) are connected using the stop-and-wait protocol. The source has infinite number of messages to send. The transmission rate (R) is 10Mbps. The propagation speed (V ) is 2 10⁸ m/sec. The distance between the two stations (D) is 1000km. The packet size is 1000bits, where 900bits of them are data and the rest (100bits) is the packet header. Assume the packet processing time is negligible. The probability of the packet failure is p_e. The ACK size is 100 bits. Assume that ACK packets never fails.

a What is the ideal timeout interval?

b Derive the system utilization in terms of R, V , D, p_e and packet (data/header) sizes. Compute the utilization value as a function of p_e.

c What is the minimum time interval required for sending a data file of 10Mbits (i.e., the time after which the probability of receiving the data is greater than 0)

d What is the maximum p_e for which the average time to send 1Mbits will be at most 60sec. Hint: As the first step, compute the average time to send one packet (i.e., 900bits data) as a function of p_e.

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