Chapter 16. Driving from Home onto the Globally
Interconnected (Internet) Roadway
What You Will Learn
After reading this chapter, you should be able to
-
Explain why connecting to the Internet provides a path for IP
packets to be sent almost anywhere
-
Describe how a modem can transmit data over an analog phone
line
-
Describe how telco creates DSL by using part of your local
phone line
-
Explain the basic concepts of sending data over your television
cable
If you have a bunch of detailed road maps, you could probably
find dozens of ways to drive to wherever you go on vacation. Some ways are
faster or longer, use good roads, or use bad roads. But at least most places in
the contiguous 48 states of the United States have a road nearby, which connects
to the other roads. You can drive anywhere in the country, with lots of
different options.
Similarly, there's already a large IP network that crisscrosses
the globethe Internet. The Internet is a combination of a ton of different
individual IP internetworks, connected to each other, so that each device has at
least one, if not many, routes over which it can send packets to other hosts.
Just like you can take the road near your house and drive almost anywhere in the
country in your car, an IP packet can get into the Internet and be routed to
almost any IP host on the planet.
In this chapter, you'll read a little about why the Internet is
useful for getting IP packets to and from an enterprise network. Then, you'll
see the basics of three technologies that you can use to access the Internet
from homenamely, modems, DSL, and cable modems. And like in Chapters 14, "Leasing a (Network) Roadway Between Two
Points," and 15, "Leasing a (Network)
Roadway Between Lots of Places," this chapter focuses on the OSI Layer 1 and 2
standards and protocols, with reminders of how routers can then forward packets
to the right destinations.
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