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CCNA · Learn
41 lessons in 6 units, about 57 h 30 min of reading and core practice. Each lesson ends with a quick check.
Specification
Unit 1
Core concepts of devices, topologies, media, addressing, wireless, virtualization, and Ethernet switching that underpin all later configuration and troubleshooting tasks.
9 lessons · 12 h 30 min of study · ≈20% of the test
Unit 2
Layer 2 campus access skills covering VLAN segmentation, trunking, discovery, EtherChannel, spanning tree, and enterprise wireless access.
8 lessons · 11 h 45 min of study · ≈20% of the test
Unit 3
Routing knowledge and skills for interpreting route information, making forwarding decisions, and configuring static routing and single-area OSPF.
6 lessons · 11 h of study · ≈25% of the test
Unit 4
Essential supporting services for translation, time, naming, addressing, monitoring, logging, QoS, and secure device management.
5 lessons · 6 h 30 min of study · ≈10% of the test
Unit 5
Foundational security knowledge for protecting network infrastructure through secure access, filtering, Layer 2 controls, AAA, and wireless security.
7 lessons · 9 h of study · ≈16% of the test
Unit 6
Modern network operations concepts covering automation, controller-led management, software-defined architectures, APIs, data formats, and basic AI/ML use in networking.
6 lessons · 6 h 45 min of study · ≈10% of the test
Start here
Network fundamentals · Lesson 1 of 9
Covers the purpose and basic operation of core network components in enterprise and small-network environments: routers, switches, firewalls, IPS, access points, wireless controllers, endpoints, and servers. The exam tests recognition of each device’s primary role, where it sits in a network, and how traffic or services flow through it.
1 h 15 min of study≈2% of the test
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Every lesson is free to read. With an account, finished lessons are ticked off, quick checks feed your mastery, and flashcards come back for review.
Strategy, scoring and test day, beyond the syllabus.
Learn, then practise
Each lesson ends with three quick questions. For more, practice adapts to the topics you’re weakest on.
Open practice