Internetworking Basics

Before we explore internetworking models and the specifications of the OSI reference model,
you’ve got to understand the big picture and learn the answer to the key question: Why is it
so important to learn Cisco internetworking?
Networks and networking have grown exponentially over the last 15 years—understandably
so. They’ve had to evolve at light speed just to keep up with huge increases in basic, mission-critical
user needs, such as sharing data and printers, as well as more advanced demands, such as videoconferencing.
Unless everyone who needs to share network resources is located in the same office
area (an increasingly uncommon situation), the challenge is to connect the relevant networks
together so all users can share the networks’ wealth.