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Module 1·20% of the exam

Network Fundamentals

How packets travel — from cables to the OSI model.

The foundational vocabulary every networker needs: hosts, links, addresses, the OSI and TCP/IP models, the difference between TCP and UDP, and the way Ethernet, IP, and the application layer combine to deliver a single web request.

8 chapters2h reading20% weightFree with an account
ARIA· module 1 intro

Welcome to module 1. How packets travel — from cables to the OSI model. I'll meet you again at the top of every chapter — this module's worth roughly 20% of the exam, so don't rush it. Pick chapter 1.1 below to start.

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Anyone can browse the syllabus. To actually read chapter content, you'll need a free account — that opens Module 1: Network Fundamentals end-to-end, the lab, and ARIA. Modules 2–8 unlock with Pro.

  • Read every chapter in Module 1 — Network Fundamentals
  • Chat with ARIA AI — 10 messages a day
  • Use the lab with up to 3 devices
  • See the full course syllabus + chapter titles
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  1. 1.1

    What is a network?

  2. 1.2

    The OSI and TCP/IP models

  3. 1.3

    Network components & topology architectures

  4. 1.4

    Cabling, interfaces, and the physical layer

  5. 1.5

    TCP, UDP, and well-known ports

  6. 1.6

    Interface and cable issues — collisions, errors, duplex/speed

  7. 1.7

    Verifying IP parameters on Windows, macOS, and Linux

  8. 1.8

    Virtualization fundamentals — VMs, containers, VRFs

Module 2
IPv4 Addressing & Subnetting
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A browser-native network lab and networking course, beginner to advanced. Free account opens Module 1 + a 3-device lab; Pro unlocks the rest.

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  • 2 · Addressing
  • 3 · Access (L2)
  • 4 · Connectivity
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