| Link Level
Retransmissions |
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| n | Selective
repeat protocols can deliver packets out |
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order |
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| n | Significantly
out-of-order delivery can trigger |
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| TCP
fast retransmit |
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| – | Redundant
retransmission from TCP sender |
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| – | Reduction
in congestion window |
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| n | Example:
Receipt of packets |
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| 3,4,5 triggers dupacks |
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| 6 |
| 2 |
| 5 |
| 4 |
| 3 |
| 2 |
| 1 |
