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Module 2·Foundational for 1.0 + 2.0 of the exam

IPv4 Addressing & Subnetting

Prefix length, the magic number, VLSM, and IPv6.

Master the math that decides where one network ends and the next begins. After this module you can subnet a /24 in your head, design an address plan with VLSM, and read an IPv6 address without flinching.

6 chapters2h readingFoundational for 1.0 + 2.0 weightPro module
ARIA· module 2 intro

Welcome to module 2. Prefix length, the magic number, VLSM, and IPv6. I'll meet you again at the top of every chapter — this module's worth roughly Foundational for 1.0 + 2.0 of the exam, so don't rush it. Pick chapter 2.1 below to start.

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  • Read every chapter in Module 1 — Network Fundamentals
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  1. 2.1

    IPv4 address structure

  2. 2.2

    Subnet masks and prefix length

  3. 2.3

    Subnetting in your head — the 5-step method

  4. 2.4

    VLSM and address planning

  5. 2.5

    Private addresses, special blocks, and NAT preview

  6. 2.6

    IPv6 fundamentals

Module 1
Network Fundamentals
Module 3
Network Access — Switching, VLANs, STP, Wireless
NetForge-AI

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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Course modules

  • 1 · Fundamentals
  • 2 · Addressing
  • 3 · Access (L2)
  • 4 · Connectivity
  • Mock exam

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