Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

iot

Explaining how acknowledgements, timeouts and retransmission make delivery reliable, and where duplicates come from

taught

Taught in

Reliability by retransmission
Connected Devices and the Internet of Things

Requires

tcp-connection-lifecycle required

Required by

Explaining in one picture why a TCP sender slows down for the receiver and for the network required

Local knowledge map

Local knowledge map

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Solid arrows are required prerequisites; dashed are recommended or helpful. Lower rows are more foundational. Click any box to jump to that concept.