Business Data Communications and Networking, 13th Edition

CHAPTER 10THE INTERNET

This chapter examines the Internet in more detail to explain how it works and why it is a network of networks. The chapter also examines Internet access technologies, such as DSL and cable modem, as well as the possible future of the Internet.

OBJECTIVES

• Understand the overall design of the Internet
• Be familiar with DSL, cable modem, fiber to the home, and WiMax
• Be familiar with possible future directions of the Internet

OUTLINE

• 10.1 Introduction
• 10.2 How the Internet Works
  • 10.2.1 Basic Architecture
  • 10.2.2 Connecting to an ISP
  • 10.2.3 The Internet Today
• 10.3 Internet Access Technologies
  • 10.3.1 Digital Subscriber Line
  • 10.3.2 Cable Modem
  • 10.3.3 Fiber to the Home
  • 10.3.4 WiMax
• 10.4 The Future of the Internet
  • 10.4.1 Internet Governance
  • 10.4.2 Building the Future
• 10.5 Implications for Cyber Security
• Summary

10.1 INTRODUCTION

The Internet is the most used network in the world, but it is also one of the least understood. There is no one network that is the Internet. Instead, the Internet is a network of networks—a set of separate and distinct networks operated by various national and state government agencies, nonprofit organizations, and for-profit corporations. The Internet exists only to the extent that these thousands of separate networks agree to use Internet protocols and to exchange data packets among one another.

When you are on the Internet, your computer (iPad, smartphone, etc.) is connected to the network of an Internet service provider ...