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The round trip delay between X and Y is given as 60 ms and bottle neck bandwidth of link between X and Y is 512 KBps. What is the optimal window size (in packets) if the packet size is 64 bytes and channel is full duplex.

As it is mentioned that channel is full duplex , so will it be changing the approach to solve the question?
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Ws= b.w delay product/packet size

    =512kbps x 60 ms/64x8=60 packets

Full duplex mode will not change anything.
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