Understanding the TCP Flag: The Role of the ACK (Acknowledgment) Flag in Connection Termination

Which flag in TCP header is used in response to a received FIN in order to terminate connectivity between two network devices?

The flag in the TCP header used in response to a received FIN to terminate connectivity between two network devices is the ACK (Acknowledgment) flag.

In TCP, the FIN (Finish) flag is used by one device to indicate that it has no more data to send in a particular direction.

When the receiving device receives a FIN, it responds with an acknowledgment by setting the ACK flag in the TCP header to inform the sender that it has received the FIN and acknowledges the termination request.

To elaborate further, when one device wants to terminate the connection, it sends a TCP segment with the FIN flag set. The receiving device, upon receiving this segment, sends an acknowledgment by setting both the ACK and the FIN flag in the TCP header. This signifies that it has received the FIN and agrees to terminate the connection in both directions.

The ACK flag helps in ensuring a reliable connection termination process between the two devices. The exchange of these TCP flags allows for a graceful closure of the connection, ensuring that all data is properly delivered and acknowledged before terminating the connectivity.

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