CCNA in 10 Weeks

200-301 v1.1

All topic guides
Fundamentals (Demo)

IPv4 Addressing Basics (Demo)

Sample topic note with CIDR tables and private range reminders.

How the sources were combined

Public demo only. Full amalgamated topic guides live in the private content package.

Demo topic note — IPv4 addressing

This page demonstrates the topic notes layout used in the full private course.

Info

Public repo: sample content only. The complete topic library is stored separately.

Host and network portions

An IPv4 address has a network portion and a host portion. The subnet mask (or CIDR prefix) tells devices where to split the bits.

CIDRMaskUsable hosts (/24 example)
/24255.255.255.0254
/25255.255.255.128126
/26255.255.255.19262

Private ranges (RFC 1918)

  • 10.0.0.0/8
  • 172.16.0.0/12
  • 192.168.0.0/16

Practice

Use the subnetting trainer for procedurally generated drills — the public demo does not ship the full scenario question bank.

Related lessons on this site

demo-osi-layers

Sources & further reading

This page is an amalgamated study guide synthesized from the markdown sources above, cross-checked against Cisco's official CCNA exam topics. Verify scope before your exam date.