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World 4 · What Happens When You Type a URL · 14 min · PRO

Connecting, encrypting, asking

TCP, TLS and HTTP

PRO · How the Internet Works

World 4: What Happens When You Type a URL 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.

  • Names instead of numbers
  • A lookup, step by step
  • DNS records
  • Why is it slow?
  • Reliable delivery on an unreliable network
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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