Functions of OSI and TCP/IP Layers Q.37

37Suppose that it takes 1 unit of time to transmit a packet (of fixed size) on a communication link. The link layer uses a window flow control protocol with a window size of N packets. Each packet causes an ack or a nak to be generated by the receiver, and ack/nak transmission times are negligible. Further, the round trip time on the link is equal to N units. Consider time i > N. If only acks have been received till time i(no naks), then the goodput evaluated at the transmitter at time i(in packets per unit time) is

Option : A
Explanation : Goodput (is the application level throughput) = Successfully delivered data/ Time = (i-N)/i = 1- N/i.

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