What is the CCNA?
The CCNA (Cisco Certified Network Associate) is a well-known entry-level networking certification. Passing it shows you understand how networks are built and fixed: cables, switches, routers, IP addresses, routing, network services, security, and automation.
This course follows the official CCNA 200-301 exam topics, area by area. Every lesson has hands-on practice and every module ends with labs, so you learn by doing, not by memorising.
Tip: This course is independent training material. It is not made, endorsed or checked by Cisco. CCNA and Cisco are trademarks of Cisco Systems, Inc.
How the course is laid out
| Exam area | What you will learn |
|---|---|
| Network infrastructure and connectivity | Cables, interfaces, IPv4 and IPv6 addressing, clients, wireless basics, DHCP |
| Switching and network access | VLANs, trunks, EtherChannel, spanning tree, CDP and LLDP |
| IP routing | The routing table, static routes, OSPF, first-hop redundancy |
| Network services and security | NAT, DNS, AAA, SSH, ACLs, layer-2 security, VPN concepts |
| AI, network operations and management | SNMP, syslog, Ansible, and how to judge advice from AI tools |
Meet NetLab
All the practice in this course happens in VulnTech NetLab, a network simulator that runs inside your browser. There is nothing to install. Each lab gives you a small network drawn as a diagram:
- Click a device to open its console. Routers and switches have a Cisco-style command line; PCs have a Windows, Linux or macOS command prompt.
- Press ? on a router or switch to see what you can type next. Tab finishes a word for you.
- Click a cable to see what kind it is, how long it is, and to swap it.
- The coloured dots at each end of a cable show the port's state: green is up, red is down, orange means someone shut the port down on purpose.
- Packet Walk lets you watch a ping travel through the network, hop by hop, with the reason for every decision a switch or router makes.
- Reset puts the network back to how it started.
Try it now. Open PC1 and type ping 10.0.0.10 to reach the server on the other side of the router. Then switch on Packet Walk and ping again to watch it.
Remember: NetLab is a simulator: it copies how real equipment behaves for everything in the CCNA. If you later practise on real gear, the commands and the output you learn here are the same kind you will see there.