Consider a TCP connection in a state where there are no outstanding ACKS. The sender sends two segments back to back. The sequence number of the first and second segments are 128 and 256 respectively....

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Extracted text: Consider a TCP connection in a state where there are no outstanding ACKS. The sender sends two segments back to back. The sequence number of the first and second segments are 128 and 256 respectively. The first segment as lost, but the second segment was received correctly by the receiver. Let X be the amount of data carried in the first segment (bytes) and Y be the ACK number sent by the receiver. The value of X + Y will be-