BACKEND ENGINEERING•Linux And Networking•Networking•2.1 TCP/IP & UDP

2.1.1 TCP vs UDP

Subtopics: TCP vs UDP and UDP.

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TCP retransmits and orders. UDP does not. HTTP and gRPC ride TCP (HTTP/3 uses QUIC over UDP).

Games, voice, and some telemetry want UDP. Banks want TCP (or QUIC with reliability).

Default to TCP/HTTP. Use UDP when you will handle loss yourself. Open firewalls knowingly — UDP amplification is a DDoS classic.

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