TCP MSS Deep Dive | Handshake, MTU, Payload & Fragmentation
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Have you ever wondered how TCP decides how much data can be sent in a single segment? In this video, we break down the concept of *Maximum Segment Size (MSS)* and explain how it helps optimize data transmission across networks.
You'll learn what MSS is, how it relates to MTU, how the common value of 1460 bytes is calculated, where MSS appears during the TCP three-way handshake, and how devices use this information to avoid fragmentation and improve network efficiency.
We also cover an important interview question: *What happens if a device doesn't advertise an MSS value during the handshake?* Does the connection fail, or is there a fallback mechanism? You'll get a clear understanding of how modern TCP implementations handle this scenario.
Whether you're preparing for networking interviews, studying TCP/IP fundamentals, learning packet analysis with Wireshark, or building a strong foundation in computer networking, this video will help you understand MSS in a simple and practical way.
📌 Topics Covered:
What is MSS (Maximum Segment Size)?
Why MSS is needed
Difference between MSS and MTU
How MSS is calculated
MSS value of 1460 explained
TCP payload vs packet size
MSS option in TCP
MSS during TCP three-way handshake
MSS negotiation process
Default MSS values
What happens when MSS is not advertised?
How MSS helps prevent fragmentation
Packet transmission efficiency
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