4. Selective acknowledgements: SACK
The classic acknowledgement method implemented by TCP, based on the ACK N˚ field, shows significant limitations when segment losses occur. Indeed, as we saw in paragraph 2.1.2 , when there are multiple losses in a transmission window, the receiving TCP can only indicate to the sender the first of the missing bytes, the latter then having to wait for the reception of an ACK acknowledging...
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Selective acknowledgements: SACK
ECN: proactive congestion control
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