Pass the CCNA before it changes.

Subnetting Mastery

Go from zero to hero at subnetting, by playing.

Subnetting feels hard because you're learning three things at once. You need to understand binary, how masks work, and how they connect to real networks. Most courses teach all three concepts at the same time.

In this course, you begin with the basics: how a single number works. Step by step, you discover how bits shift, how masks divide networks, and how subnets fit together.

What you'll learn

You'll see how networks divide into smaller subnets, like floors in a building. Each lesson builds on the last:

• Understand the basics: Learn how IP addresses and subnet masks work using real examples.
• Learn binary numbers: See patterns that make subnetting understandable.
• Design your own subnets: Create networks that work.
• Troubleshoot real problems: Fix broken networks and plan for growth.

Data Center Foundations

Your first step into data center careers.

Core Cisco data center technologies and the foundations for entry-level roles such as Data Center Network Technician, NOC Technician and Infrastructure Support Technician.

• Configure and verify features in guided labs and simulations
• Learn networking, virtualization, storage, compute and cloud computing
• Pick up automation basics with Python, Ansible and Terraform
• Explore Cisco ACI, cloud concepts and service models