CCNA

The world of networks

Introduction

Communication has evolved greatly. Traditional communication methods such as mail have been overtaken by more sophisticated forms. Electronic Communication methods offer higher speeds; more efficiency, reliability, integrity, security; scale across larger geographical areas and require less resources to use. Tools and services such as e-mail, blogs, podcasts, instant messaging, and social networks among other multimedia methods have changed the way we communicate to a great extent.

In this chapter, we give an overview of the world of networks: we will discuss the following:

1. The role of networks in our lives
2. Explain the qualities and elements of a network
3. Define key terms and diagrams used in this course
4. Explain what a converged network is
5. Give a brief history of computer networks

This chapter is crucial since some of the concepts learned in it will be useful in understanding the rest of the course.

The role of networks.

The need to communicate is human nature. Communication has evolved over the years, from carvings on rocks to more complex forms. The diagram below is an apt description of this evolution.

Modern communication methods are as a result of the evolution of computer networks. Since the first e-mail was sent back in 1965, communication has come a long way.

We are no longer restricted with face to face communication. And with the internet the world has become more interconnected than ever before.

Computer networks are not just responsible for communication, but our entire way of life has evolved. The way we work, the way we interact, among other ways have changed significantly.

Some of the ways we use computer networks include:

• Business – online banking, e-mail, e-commerce.
• Entertainment – online movies, online games.
• Social interactions – instant messaging, social networking sites.

Clearly, therefore, networks play a central role in our lives.