1. Introduction

The Internet is the largest network on the planet. It has changed the we live, work, keep in touch and make friends. And behind it all is a set of rules that ensure that every device knows how to communicate with every other device. This set of rules is called the TCP/IP Protocol.

This section will introduce you to the protocol and how it works.

We will use the Internet Four Layer Model to describe it. The model itself has its own section here and is used to describe other protocols as well.