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TCP implements SWP for flow control. It advertises window field in TCP header is used for this purpose then compute it's value if MaxRcvBuffer is 100 Bytes, NextByteExpected is 51 and LastByteRead is 40 ________.

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Last byte read is 41
Next byte expected is 51
So the bytes between 41 and 50 are still in buffer i.e. 10 bytes and size of buffer is 100.
So 90 bytes of buffer are empty. Advertised window is 90
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