TCP Termination Process

Understanding the TCP connection termination handshake

This medium-difficulty networking question tests your knowledge of how TCP gracefully closes a connection between two endpoints. It's the kind of question Arista and other infrastructure-focused firms use to verify that candidates understand the protocol mechanics underlying reliable data transmission.

To answer questions like this, you need to recall the sequence of control packets exchanged during the shutdown phase, the flags involved, and the state transitions each party goes through. The question rewards precision: interviewers want to see that you can distinguish between the normal termination path and understand what each packet signals to the other side.

• TCP state machine and shutdown states
• FIN (finish) and ACK (acknowledgement) flags
• Graceful vs. abrupt connection closure
• Half-open connections and bidirectional closing