This guide explains TCP connection states, essential Linux commands, three‑way handshake, four‑way termination, simultaneous open/close, flag meanings, common error codes, and keep‑alive techniques to help you troubleshoot and secure network services effectively.
This article explains the TCP three‑way handshake, the four‑step connection termination process, and the eleven TCP state transitions, detailing the role of SYN, ACK, and FIN flags and illustrating each step with clear diagrams and concise descriptions.
This article explains the TCP three‑way handshake and four‑way termination processes, their state transitions, key interview points such as ISN, half‑connection queues, data transmission during handshakes, and the importance of the TIME_WAIT state, providing detailed answers suitable for technical interviews.
Understanding TCP state transitions, common diagnostic commands, and the detailed processes of connection establishment, termination, and related issues such as SYN flood, TIME_WAIT, and keepalive mechanisms equips engineers to troubleshoot network and system faults effectively.
