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Coddy

LAN Labs

via Coddy

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Overview

Build, address and troubleshoot small networks in a terminal lab: hosts, switches and routers, cables, IPv4 addresses and masks, ARP, gateways, routing tables, and the classic faults that break real LANs.

Prerequisites:

  • Comfortable running commands in a terminal
  • Basic idea of IP addresses and subnet masks (our IP Addressing and Subnetting course covers it)

Syllabus

Meet the Lab

  • Your First Lab
  • Cables
  • Wires Are Not Enough
  • Recap - Build a Lab

Addresses on the LAN

  • Giving a Host an Address
  • The First Ping
  • What ARP Learned
  • The Switch Learns Too
  • Recap - First Conversation

Masks Matter

  • Wrong Mask, No Reply
  • Same Switch, Other Subnet
  • Let check Do the Looking
  • Recap - Diagnose the Pair

Routers and Gateways

  • Two Networks
  • The Default Gateway
  • Both Sides Need a Way Back
  • Routing Tables
  • Recap - Connect the Floors

Troubleshooting I

  • The Unplugged Host
  • The Missing Gateway
  • The Typo in the Mask
  • Recap - Two Faults

Troubleshooting II

  • Two Devices, One Address
  • The Network Address Trap
  • Gateway on the Wrong Subnet
  • Recap - The Silent Router

Growing the Office

  • The Plan
  • Sales Comes Online
  • Engineering Joins
  • Gateways Everywhere
  • Recap - The Printer

Capstone - Fix the Branch

  • Survey the Damage
  • Fix the Address Clash
  • Masks and Gateways
  • Recap - Prove It Works

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