What is the operational difference between standard ACKs used in conventional TCP and SACKs used in wireless TCP? What improvement in performance does it provide for wireless networks?
What will be an ideal response?
Conventional TCP uses cumulative acknowledgements wherein an ACK for a
particular segment can be used cumulatively to acknowledge all the preceding
segments. In SACKs used in wireless TCP, the ACKs can be used to
acknowledge segments selectively rather than cumulatively. The advantage of this
is that if a particular segment in a transmission is corrupted, then the sender needs
to retransmit only that particular segment, thereby saving precious bandwidth that
would have been wasted due to the retransmissions of the succeeding segments
that have been received correctly.
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