Count The Duplicates
A sender transmits six 1000-byte segments back to back. The second one is dropped in the network. Every other segment arrives.
| segment sent (seq) | receiver's reaction |
|---|---|
| 1000 | ACK 2000 |
| 2000 | dropped |
| 3000 | ACK 2000 |
| 4000 | ACK 2000 |
| 5000 | ACK 2000 |
| 6000 | ACK 2000 |
The RTO has not expired. When does the sender retransmit, and what does it send?
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