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A course in 3 phases · no experience needed

Network Foundations I

Beginners

How computers find each other and talk — the addresses, routes, and quiet conversations underneath every page you've ever loaded. No experience needed — a reading course today, with hands-on labs to come.

Start — What a Network Is →Nothing ever locks — skip ahead anytime
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Your build

0 of 41 concepts are up. It’s coming along.

01 · The Wires0/14
02 · The Map0/13
03 · The City0/14

Phase 01 — The Wires

7 lessons · 14 concepts
Ready to build
  1. What a Network IsYou are hereResume →
    2 concepts to go
  2. Bits & Signals
    2 concepts
  3. Wired & Wireless
    2 concepts
  4. Packets
    2 concepts
  5. Your Local Network
    2 concepts
  6. The Home Router
    2 concepts
  7. Speed & Delay
    2 concepts

Phase 02 — The Map

7 lessons · 13 concepts
Ready to build
  1. Every Device Has an Address
    2 concepts
  2. Getting an Address
    2 concepts
  3. One Address per House
    2 concepts
  4. Names, Not Numbers
    2 concepts
  5. Ports: Many Conversations
    2 concepts
  6. Routers & Hops
    2 concepts
  7. Tracing the Path
    1 concept

Phase 03 — The City

7 lessons · 14 concepts
Ready to build
  1. The Internet vs. the Web
    2 concepts
  2. HTTP: Asking for Pages
    2 concepts
  3. HTTPS: Sealed Envelopes
    2 concepts
  4. Servers & the Cloud
    2 concepts
  5. Copies Near You
    2 concepts
  6. Walls & Guards
    2 concepts
  7. When the Internet Breaks
    2 concepts

Nothing ever locks. Skip ahead whenever you like — all 21 stops are open from day one, and unbuilt concepts wait on the map until you come back for them.