This book serves first as a textbook in some college networking courses. At the same time, you might want a career in networking somewhere down the road, and this book helps you with a big step in that journey by helping you pass a Cisco certification exam.
If you want to succeed as a technical person in the networking industry at all, you need to know Cisco. Cisco has a ridiculously high market share in the router and switch marketplace, with more than 80 percent market share in some markets. In many geographies and markets around the world, networking equals Cisco. If you want to be taken seriously as a network engineer, Cisco certification makes perfect sense.