Consider a TCP client and TCP server running on two different machines. After completing data transfer, the TCP client calls close to terminate the connection and a FIN segment is sent to the TCP server. Server-side TCP responds by sending an ACK, which is received by the client-side TCP. As per the TCP connection state diagram (RFC 793), in which state does the client-side TCP connection wait for the FIN from the server-side TCP?

LAST - ACK
TIME-WAIT
FIN-WAIT-1
FIN-WAIT-2

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 4 : FIN-WAIT-2

After completing the data transfer, the TCP client executes a close primitive, and a FIN segment is sent to the TCP server by the client and wait for the corresponding ACK from the server. After this, two cases will happen:

1) When the ACK arrives from the server, a transition is made to state FIN-WAIT 2 by the client and then one direction of the connection will be closed. When other side closes too, a FIN comes in which is acknowledged and both sides will be closed.

2) In second case, instead of getting ACK from server till the time-out, TCP client received FIN from server. Client will acknowledge this FIN and then it will move to the close state. TCP client will wait for the ACK for its own FIN from server. After receiving ACK, TCP client will move to the TIME-WAIT state.

Diagram:

4 views Answered 2022-09-04 04:29

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