OSI vs. TCP/IP: Troubleshoot Networks One Layer at a Time

When something breaks on a network, the instinct is often to start checking everything at once: the cable, the IP settings, the firewall, the DNS. But troubleshooting everything at once wastes time. Network reference models give you a starting point, helping you narrow the problem to a specific layer of the network stack so you know where to look first.

That kind of structured troubleshooting starts with understanding the OSI and TCP/IP models. In CBT Nuggets' CompTIA Network+ course, the first skill, Using Reference Models, teaches you how these two frameworks help IT professionals understand network communication, isolate problems, and troubleshoot more efficiently. It's free to start, and what might seem abstract at first can become one of the most practical thinking tools you'll use on the job.

Start With a Free Network+ Skill: Using Reference Models