TCP SACK, DSACK & RACK: Modern Loss Recovery is part of the Pro tier — advanced networking topics including BGP routing, Zero Trust, DDoS attacks, QUIC, TLS certificate chains, and more.
This scenario covers
How TCP's modern loss recovery mechanisms work together — Selective ACK (SACK) avoids retransmitting received data, DSACK detects spurious retransmissions, and RACK uses packet timing to detect loss faster than dupACK counting.
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