As shown in figure 172 the are simplex half duplex and

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Unformatted text preview: -server database system? How is it better than a conventional database client? 103. What is a distributed database system? What is the main motivation behind using such a system? 104. What is an active database system? Explain how an active database system monitors and reacts to specific circumstances of relevance to an applicati Chapter 17 Data Communications and Computer Networks It is not the processing power of computers, but the power of communication among computers that has revolutionized the information age. The marriage of computing and data communication technologies (means and methods by which data is transferred from one location to another) is one of the most exciting developments in today's information age. This development has given birth to computer networks. A computer network is a network of geographically distributed multiple computers connected in such a way that meaningful transmission and exchange of information become possible among them. Sharing of information, sharing of resources (both hardware and software), and sharing of processing load are some of the major objectives of a computer network. The goal of this chapter is to introduce the various aspects of data communications technology and to discuss how this technology is combined with computer technology to form computer networks. Following are some of the important concepts, which you will learn from this chapter: 1. Basic elements of a communication system. 2. The techniques, channels and devices used to transmit data between distant locations. 3. The various types of computer networks. 4. Communication protocols, which are rules and procedure for establishing and controlling the transmission of data from one computer to another. 5. Characteristics and advantages of distributed data processing. Communication is the process of transferring messages from one point to another. As shown in Figure 17.1, the three basic elements of any communication process are: 1. A sender (source), which creates the message to be tran...
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This document was uploaded on 04/07/2014.

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