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Question: 1 / 1980

What does the TCP FIN flag indicate in a TCP connection?

Start of the connection

Signal for terminating the connection gracefully

The TCP FIN flag is an important mechanism within the TCP (Transmission Control Protocol) used to manage the connection lifecycle. When a device sends a TCP segment with the FIN flag set, it indicates that the sender has finished sending data and wishes to terminate the connection gracefully. This is part of the connection teardown process, where both parties in the TCP communication acknowledge that they no longer need to send or receive data.

In the context of TCP, a graceful termination allows for all remaining data to be effectively transmitted and acknowledged before closing the connection, ensuring that no data is lost during the process. The other options pertain to different aspects of TCP operations: the initiation of a connection, requests for data retransmission, or the establishment of data packets, none of which accurately describe the role of the FIN flag in concluding a session.

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Request for data retransmission

Establishment of a data packet

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