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A connection is an agreement between two kernels

SYN, SYN-ACK, ACK: what each message proves, why loss stalls instead of failing, and what SYN-SENT is telling you.

22 minutesTechnical content last reviewed on 20 Sept 2026

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What this lesson builds

  • Choosing and reading a transport
  • Saying what an output proves, and what it leaves open