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Learn networking

Build real networks, break them, and fix them. Every level is a live network you can poke at, and every chapter ends with a capstone where you put it all together.

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Start here
Two computers, one cable
Build the smallest network there is and send your first ping.

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  1. Chapter 1

    Your first network

    Cables, addresses, switches, DHCP and DNS. By the end you’ll set up a whole lab from scratch.

    0/6
    1. 1
      Two computers, one cable
      Build the smallest network there is and send your first ping.
      8 min
    2. Meet the switch
      Three computers, one port each. Time for a switch.
      8 min
    3. Wrong street
      The new front office PC can’t reach anybody. Find out why.
      7 min
    4. Addresses on autopilot
      Typing addresses by hand gets old fast. Let a server hand them out.
      9 min
    5. Names, not numbers
      Nobody remembers 192.168.1.2. Set up DNS so a name works.
      8 min
    6. Capstone: the library labCAPSTONE
      A switch, a server and four PCs in boxes. Make it all work.
      20 min
  2. Chapter 2 · coming soon

    Connecting networks

    Routers, gateways and routes: how a message leaves its own network and finds another one.

  3. Chapter 3 · coming soon

    Switching for real

    VLANs to split one switch into many, and spanning tree to survive a loop.

  4. Chapter 4 · coming soon

    Locking it down

    ACLs and firewalls: let the right traffic through and stop the rest.

  5. Chapter 5 · coming soon

    Out to the internet

    NAT, and how a whole school shares one public address.

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