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Module 03 · NetworkingFaster, private, everywhere

Reading a book aloud to America

The Long-Distance Reading
The Long-Distance Reading · Open board

A live 45 MB download from Ashburn, Virginia (13,000 km), with the connection’s pulse sampled 4× a second by teaching/code/tcp_watch.py.

Before you start. You need the handshake from TCP vs UDP, and the 3-way handshake: before any of your data moves, both ends already spend one round trip agreeing the call is live, and a round trip is how long a signal takes to reach the far end and its reply to come back. This lesson is about the next thirty seconds after that - how fast your side dares to talk once the call is already open.

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Lab

A bigger waiting yard means fewer parcels turned away. Why does it make the whole house feel slower?

Drag Parcels the yard can hold from 5 to 1000 and watch a game's ping under each rule.

Open The full buffer →

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← The hold line (the listen queue, and the SYN flood)Where the time goes (the four delays, and the buffer that fills) →