How is the stability and robustness of a TCP connection ensured during data transfer?

TCP ensures the stability and robustness of the connection through several key mechanisms:

• Connection establishment (3-way handshake): a reliable connection is established before data transfer, ensuring both parties are ready to communicate.
• Packet numbering and acknowledgment: each TCP segment has a sequence number, and the receiver sends acknowledgments (ACK), which helps detect data loss and retransmit if necessary.
• Flow control: the sliding window mechanism regulates the data transfer rate to prevent overwhelming the receiver.
• Congestion control: algorithms such as slow start and congestion avoidance adjust the transmission rate based on network conditions.
• Retransmission: if an acknowledgment for a segment is not received within a timeout, the data is retransmitted.

These mechanisms together provide reliable, ordered, and robust data transmission over TCP.