Before exploring internetworking models and the OSI model’s specifications, you need to
grasp the big picture and the answer to this burning question: Why is it so important to learn
Cisco internetworking anyway?
Networks and networking have grown exponentially over the past 20 years, and under-
standably so. They’ve had to evolve at light speed just to keep up with huge increases in
basic, mission-critical user needs, (e.g. simple sharing data and printers), as well as greater
burdens like multimedia remote presentations and conferencing. Unless everyone who needs