TCP: retransmission scenarios Host A timeout Seq=92, 8 bytes of data X Host B ACK=100 Seq=92, 8 bytes of data ACK=100 lost ACK scenario Host A SendBase=92 timeout SendBase=100 SendBase=120 SendBase=120 Seq=92, 8 bytes of data Seq=100, 20 bytes of data ACK=100 ACK=120 Seq=92, 8 bytes of data Host B ACK 120 premature timeout send cumulative ACK for 120 ↑

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