Computer Networking › Section C · The transport layer › Topic C.3
Connectionless transport: UDP
UDP is the thinnest transport protocol the internet offers: four header fields, no handshake and no promises. That bare simplicity is exactly why DNS, live media, games and even the modern web's QUIC protocol build on it.
In this topic
- A bare-bones transport
- Why choose UDP over TCP?
- Who uses UDP
- Reliability on top of UDP
- The UDP segment
- How the checksum is computed
- Worked example: computing a checksum
- Worked example: what the receiver sees
- Why check end to end?
- Common mistakes to avoid
- Key takeaways
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