Computer Networking › Section C · The transport layer › Topic C.8

Evolution of the transport layer: QUIC

TCP and UDP date from around 1980, but the transport layer has not stood still. QUIC rebuilds reliable, secure transport on top of UDP for the modern web, and new congestion-control algorithms, CUBIC and BBR, now set the pace of most internet traffic.

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In this topic

Why the transport layer kept changing
QUIC in outline
Faster connection setup
Worked example: time to first response
Streams and head-of-line blocking
Worked example: one loss, three objects
Connection IDs and migration
CUBIC
Worked example: CUBIC after a loss
BBR
Common mistakes to avoid
Key takeaways

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