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World 5 · TCP: Did You Get That? · 12 min · PRO

The three-way handshake

SYN, SYN-ACK, ACK

PRO · How the Internet Works

World 5: TCP: Did You Get That? is part of PRO

The first world of How the Internet Works is free. PRO opens the other 26 lessons in 6 worlds — simulations, quizzes and all.

  • Reliable delivery on an unreliable network
  • Lost packets
  • Slow start and fairness
  • Radio waves in your room
  • Signal loss
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  • Practice exams and certificates

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