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Coddy

The OSI Model

via Coddy

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Overview

How networks really talk, one layer at a time: the seven OSI layers, MACs and ARP, IP and routing, TCP, UDP and ports, encapsulation, and the full journey of a packet, with hands-on terminal walkthroughs.

Prerequisites:

  • Comfortable running commands in a terminal
  • No networking knowledge required

Syllabus

Why Layers

  • The Layering Idea
  • Seven Layers
  • Numbers and Names
  • Recap - The Stack

The Physical Layer

  • Bits on a Wire
  • How Long Will It Take
  • Duplex and Collisions

Data Link and MACs

  • Frames and MACs
  • Reading a MAC
  • ARP
  • Recap - Layer Two

The Network Layer

  • IP and TTL
  • Ping and ICMP
  • Routing Tables
  • Recap - Layer Three

Transport: TCP and UDP

  • Ports
  • The TCP Handshake
  • TCP vs UDP
  • Sockets in Action
  • Recap - Layer Four

The Upper Layers

  • Session and Presentation
  • The Application Layer
  • Watching the Layers
  • Recap - Top of the Stack

Encapsulation

  • Wrapping Data
  • Headers Everywhere
  • Reading a Capture
  • Recap - Follow the Wrap

The Journey of a Packet

  • A Click Happens
  • Crossing the Networks
  • Arriving and Climbing
  • Recap - End to End

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