Both Fins Crossed
Hosts A and B are in ESTABLISHED. Both applications call close() at nearly the same instant, so the two FIN segments cross in the network. Every segment below is delivered in the order shown at the receiving side.
| Step | Sender | Segment |
|---|---|---|
| 1 | A | FIN, ACK seq=5000 ack=9000 |
| 2 | B | FIN, ACK seq=9000 ack=5000 (already in flight when step 1 was sent) |
| 3 | A | ACK ack=9001 |
| 4 | B | ACK ack=5001 |
After step 4 has been processed at both ends, what are A and B doing?
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