Introduction to TCP/IP

If you’ve been using TCP/IP-based networking products for any length of time at
all, you’re probably already aware of how IP addressing, routing, and other fundamental
aspects of the Internet family of protocols work, at least from a user’s perspective.
What you probably don’t know—unless you’ve been formally trained in these subjects—
is what makes TCP/IP work from the wire’s perspective, or from the perspective
of the applications in use on your network. This chapter provides you
with an introduction to these viewpoints, providing you with a better understanding
of the nature of the traffic on your network.