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Relationship between the variables, SendBase and LastByteRcvd:
SendBase-1 <=LastByteRcvd
Detailed Explanation:
SendBase-1 is used to find the sequence numberof the last byte(Refer Section 3.5.4 from the text book)
LastByteRcvd is used to find the number of the last byte in the stream of data arrival from network to buffer. So, SendBase is the LastByteRcvd at the receiver end.