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Doesn't TCP use both?

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TCP uses only cumulative acknowledgements.

sender seqno=100--------------------------receiver ack=101

sender seq no=150(instead of 101)------------------receiver ack=101

sender seq no=200--------------------receiver ack=101

sender seq no=101------------------------receiver ack=201 

Receivers sends only cumulative instead of independent seq no for every segment.

http://www.cs.newpaltz.edu/~easwaran/CCN/Week6/tcpACK.pdf

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