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[Acronym] for __S__elective __A__cknowledgement. [TCP] by "default" can only [ACK] up until a certain point, so if it loses just one packet, it must ask for a retransmit for all the packets after that. [SACK] means TCP can ask for just that packet to be retransmitted, or in fact multiple sets of missing sequences of packets. see [TCP] and RFC:2018
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