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IT Services Circle
IT Services Circle
May 8, 2026 · Fundamentals

Understanding TCP: Three-Way Handshake, Four-Way Teardown, TIME‑WAIT, and HTTP/2

This article explains the OSI seven‑layer model, TCP header fields, the three‑way handshake and four‑way termination processes, TIME‑WAIT timing, connection capacity calculations, packet fragmentation and reassembly, flow control, HTTP version differences, HTTPS security flow, and common analysis tools like Wireshark.

Four-way terminationHTTP/2OSI model
0 likes · 15 min read
Understanding TCP: Three-Way Handshake, Four-Way Teardown, TIME‑WAIT, and HTTP/2
MaGe Linux Operations
MaGe Linux Operations
Jan 8, 2025 · Fundamentals

Why TCP Uses a Three‑Way Handshake (and How the Four‑Way Close Works)

This article explains why TCP requires a three‑way handshake instead of two, details the six TCP flag bits, clarifies sequence and acknowledgment numbers, walks through each handshake step with example numbers, and describes the four‑way termination process and related timing considerations.

Four-way terminationSequence NumberThree-way handshake
0 likes · 8 min read
Why TCP Uses a Three‑Way Handshake (and How the Four‑Way Close Works)
JavaEdge
JavaEdge
Sep 16, 2024 · Fundamentals

Why TCP Needs Three Handshakes and Four Teardowns: A Deep Dive

This article explains the fundamental differences between UDP and TCP, details the TCP header fields, walks through the three‑way handshake and its necessity, describes the four‑way termination process, and illustrates the complete TCP state machine with diagrams and practical examples.

Four-way terminationTCPThree-way handshake
0 likes · 14 min read
Why TCP Needs Three Handshakes and Four Teardowns: A Deep Dive
Deepin Linux
Deepin Linux
Aug 16, 2023 · Fundamentals

Fundamentals of TCP/IP: Protocol Suite, Standardization Process, and Layered Model

This article provides a comprehensive overview of TCP/IP, covering its definition as a protocol suite, the open and practical standardization process driven by IETF, the role of RFCs and STD numbers, the multi‑stage standardization workflow, the layered architecture compared with the OSI model, and detailed explanations of packet headers, data flow, and connection management such as the three‑way handshake and four‑way termination.

Four-way terminationNetwork ProtocolsPacket Transmission
0 likes · 31 min read
Fundamentals of TCP/IP: Protocol Suite, Standardization Process, and Layered Model
Liangxu Linux
Liangxu Linux
Sep 4, 2022 · Fundamentals

What Happens When TCP Handshake or Teardown Packets Are Lost?

This article explains how TCP connections behave when any of the three-way handshake or four-way termination packets are lost, detailing the kernel‑controlled retransmission mechanisms, timeout intervals, relevant sysctl parameters, and the exact sequence of events for each loss scenario.

Four-way terminationLinuxPacket Loss
0 likes · 13 min read
What Happens When TCP Handshake or Teardown Packets Are Lost?
Top Architect
Top Architect
Jul 22, 2022 · Fundamentals

Differences and Principles of TCP and UDP Protocols

This article provides a comprehensive overview of TCP and UDP, explaining their roles in the transport layer, key differences such as connection orientation and reliability, the three‑way handshake and four‑way termination processes of TCP, and the typical use cases and limitations of each protocol.

Four-way terminationNetworkingTCP
0 likes · 9 min read
Differences and Principles of TCP and UDP Protocols
IT Architects Alliance
IT Architects Alliance
Jun 12, 2022 · Fundamentals

TCP Three-Way Handshake and Four-Way Termination Explained

This article explains how TCP ensures reliable connections through the three-way handshake process—including SYN, SYN‑ACK, and ACK exchanges—and describes the four-step termination sequence with FIN and ACK flags, while also clarifying why three handshakes are necessary instead of two.

Four-way terminationReliabilityTCP
0 likes · 7 min read
TCP Three-Way Handshake and Four-Way Termination Explained
Open Source Linux
Open Source Linux
Apr 7, 2022 · Fundamentals

Why Does TCP Require a Three‑Way Handshake and a Four‑Way Teardown?

This article explains how TCP guarantees reliable transmission through a three‑way handshake for connection establishment and a four‑step termination process, detailing each packet’s flags, sequence numbers, and the reasons why these multi‑step procedures are essential for robust network communication.

Four-way terminationTCPThree-way handshake
0 likes · 7 min read
Why Does TCP Require a Three‑Way Handshake and a Four‑Way Teardown?
Wukong Talks Architecture
Wukong Talks Architecture
Sep 30, 2021 · Fundamentals

Computer Network Fundamentals: OSI/TCP‑IP Layers, TCP/UDP Differences, Handshakes, and Related Mechanisms

This article provides a comprehensive overview of computer networking fundamentals, covering OSI and TCP/IP layer models, the functions of each layer, detailed comparisons between TCP and UDP, the three‑way handshake, four‑way termination, SYN‑flood attacks, congestion control, and practical mitigation techniques.

Four-way terminationNetwork ProtocolsSYN Flood
0 likes · 21 min read
Computer Network Fundamentals: OSI/TCP‑IP Layers, TCP/UDP Differences, Handshakes, and Related Mechanisms
ITPUB
ITPUB
Apr 21, 2021 · Fundamentals

Understanding TCP: From Three‑Way Handshake to Four‑Way Teardown and State Transitions

This article explains TCP's connection‑oriented behavior, detailing the three‑way handshake for establishing a connection, the four‑step termination process, various state transitions, half‑open/half‑close scenarios, simultaneous open/close, initial sequence numbers, and the role of RST and TIME_WAIT.

Connection ManagementFour-way terminationTCP
0 likes · 19 min read
Understanding TCP: From Three‑Way Handshake to Four‑Way Teardown and State Transitions
Efficient Ops
Efficient Ops
Nov 11, 2020 · Fundamentals

Why Does TCP Need a Three‑Way Handshake? A Simple Analogy Explained

The article uses a humorous long‑distance video‑chat scenario to illustrate why TCP requires a three‑way handshake for connection establishment and a four‑step termination, explaining each packet exchange, flag meanings, and related concepts such as half‑open connections and SYN‑flood attacks.

Four-way terminationSYN attackTCP
0 likes · 11 min read
Why Does TCP Need a Three‑Way Handshake? A Simple Analogy Explained
Liangxu Linux
Liangxu Linux
Aug 24, 2020 · Fundamentals

Mastering TCP: How the Three‑Way Handshake and Four‑Way Teardown Work

This article explains TCP's core mechanisms, detailing the three‑way handshake and four‑way termination processes, the meaning of ACK, SYN, and FIN flags, and the eleven connection states with their roles in establishing and gracefully closing a reliable network connection.

Connection StatesFour-way terminationNetworking Fundamentals
0 likes · 8 min read
Mastering TCP: How the Three‑Way Handshake and Four‑Way Teardown Work
Efficient Ops
Efficient Ops
Mar 1, 2020 · Fundamentals

Why Does TCP Need a Three‑Way Handshake? A Real‑World Analogy Explained

Using a quirky long-distance video-chat scenario, the article illustrates how TCP’s three-way handshake and four-way termination work, explains the purpose of each packet exchange, details TCP header fields, and even covers SYN-flood attacks, turning everyday communication glitches into networking fundamentals.

Four-way terminationSYN FloodTCP
0 likes · 10 min read
Why Does TCP Need a Three‑Way Handshake? A Real‑World Analogy Explained
Java Captain
Java Captain
Apr 14, 2019 · Fundamentals

Understanding TCP Three-Way Handshake and Four-Way Termination for Interviews

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.

Four-way terminationInterview PreparationNetworking
0 likes · 12 min read
Understanding TCP Three-Way Handshake and Four-Way Termination for Interviews
JD Tech Talk
JD Tech Talk
Mar 6, 2019 · Fundamentals

Understanding TCP Three‑Way Handshake and Four‑Way Termination

This article explains the essential conditions for TCP communication, details the three‑step handshake and four‑step termination processes with packet‑capture illustrations, and discusses why these sequences ensure reliable connections between a client and a server.

Four-way terminationNetwork ProtocolsReliability
0 likes · 8 min read
Understanding TCP Three‑Way Handshake and Four‑Way Termination
Efficient Ops
Efficient Ops
Mar 8, 2018 · Fundamentals

Why Does TCP Need a Three‑Way Handshake? A Simple Analogy Explained

The article uses a quirky long‑distance video‑chat scenario to illustrate TCP’s three‑way handshake and four‑way termination, explaining the protocol’s packet format, flag meanings, SYN‑attack risks, and step‑by‑step connection establishment and teardown.

Four-way terminationNetwork ProtocolsSYN attack
0 likes · 11 min read
Why Does TCP Need a Three‑Way Handshake? A Simple Analogy Explained