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The state diagram at 12.7 TCP state diagram shows a dashed path from FIN_WAIT_1 to TIMEWAIT on receipt of FIN+ACK. All FIN packets contain a
The state diagram at 12.7 TCP state diagram shows a dashed path from FIN_WAIT_1 to TIMEWAIT on receipt of FIN+ACK. All FIN packets contain a valid ACK field, but that is not what is meant here. Under what circumstances is this direct arc from FIN_WAIT_1 to TIMEWAIT taken? Explain why this arc can never be used during simultaneous close. Hint: consider the ladder diagram of a normal close.
https://intronetworks.cs.luc.edu/current/html/tcp.html#tcp-state-diagram
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