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S1 : Loss of ACK from client doesn’t effect on termination of connection.

S2 : The client moves FIN-Wait-1 → FIN-Wait-2 → closed in the state machine on no packet loss.

S3 : Loss of ACK from server restrict termination of connection.

 

Options Are: 

  1. S1 and S2
  2. S2 and S3
  3. S1 and S3
  4. S2 only

1 Answer

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The answer should be option D i.e S2 only, since the correct state transition for TCP after receiving close command from application layer would be

to send FIN and move to FIN-WAIT-1 state

on receiving ACK from server, move to FIN-WAIT-2 state

on receiving FIN from server, move to TIME-WAIT state.

on timeout move to CLOSED state

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