Lesson 2 - Programs, Processes, Protocols, and Layers

   Introduction

In the previous lesson, we reviewed the various ways that computers and networks can be physically connected. However, network communication relies on more than simple hardware connections. Several layers of software components are also necessary to exchange data between applications on different linked computers. This lesson reviews the principles that allow those software components to communicate.

   Objectives

At the end of this lesson you should be able to:

1.	Describe the difference between a program and process
2.	Name the two ways that most computers communicate in a LAN
3.	Explain the relationship between protocols and services
4.	Describe the relationship between a communication process and its corresponding header
5.	Explain how different address types are used to transmit information from one computer application to another

Key Point
Peer-to-peer and client/server are the most common methods of communicating in a LAN.

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