Chapter 1. INTRODUCTION TO DATA COMMUNICATIONS
THIS CHAPTER introduces the basic concepts of data communications and shows how we have progressed from paper-based systems to modern computer networks. It begins by describing why it is important to study data communications and how the invention of the telephone, the computer, and the Internet has transformed the way we communicate. Next, the basic types and components of a data communication network are discussed. The importance of a network model based on layers and the importance of network standards are examined. The chapter concludes with an overview of three key trends in the future of networking.
OBJECTIVES ▾
Be aware of the history of communications, information systems, and the Internet
Be aware of the applications of data communication networks
Be familiar with the major components of and types of networks
Understand the role of network layers
Be familiar with the role of network standards
Be aware of three key trends in communications and networking
CHAPTER OUTLINE ▾
INTRODUCTION
A Brief History of Communications in North America
A Brief History of Information Systems
A Brief History of the Internet
DATA COMMUNICATIONS NETWORKS
Components of a Network
Types of Networks
NETWORK MODELS
Open Systems Interconnection Reference Model
Internet Model
Message Transmission Using Layers
NETWORK STANDARDS
The Importance of Standards
The Standards-Making Process ...
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