Ace Test Series: Computer Networks - Tcp

Question

Doesn't TCP use both?

Comments

TCP can use both Go-Back or Selective repeat. But it prefers Selective Repeat as bandwidth Consumption is less. Hence, answer must be cumulative.

https://gateoverflow.in/82647/self_doubt

Answer 1

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

Answer 2

https://en.wikipedia.org/wiki/Transmission_Control_Protocol#Selective_acknowledgments

Uses both

Comments

what should be the exact answer should we go for both?

Answer 3

TCP uses both cumulative and independent acks