Introduction To the OSI Model

| Article | Studying the OSI model is like eating vegetables. It's good for you but might not seem so at the time. Even after almost 20 years, OSI remains the leading framework for network design. You have to understand it cold if you want a networking certification. Cisco certifications may have traditionally focused only on Layers 2 and 3, but even this is changing as routers and switching techniques continue to evolve.