Page 120 - DCAP516_COMPUTER_SECURITY

Computer Security Avinash Bhagat, Lovely Professional University

Notes Unit 10: Network Concepts

CONTENTS
Objectives
Introduction

10.1 History of Computer Networks
10.2 Defining Network
10.3 Characteristics of Computer Network

10.4 Networking Goals
10.5 Network Hardware
10.5.1 Local Area Networks
10.5.2 Metropolitan Area Networks
10.5.3 Wide Area Networks

10.5.4 Wireless Networks
10.5.5 Internetworks
10.6 Uses of Computer Networks

10.6.1 Network for Companies
10.6.2 Networks for People
10.7 Network Topologies
10.8 Summary
10.9 Keywords

10.10 Review Questions
10.11 Further Readings

Objectives

After studying this unit, you will be able to:

Know about the various uses of computer networks from the most general types to the
possible uses in more specific circumstances

Understand the different technologies involved in defining the network hardware
Discuss the concept of process network software and the significance of layering the
communication process and related design issues for the layers

Introduction

The merging of computers and communications has a profound influence on the way systems
are organized. The concept of computer center as a room with a large computer to which the
users bring their work for processing is now obsolete. The old model of a single computer
servicing all the computational needs of an organization has been replaced by the one in which
a large system of separate but interconnected computers do the job. These systems are called

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