12
DATA COMMUNICATION AND NETWORKING
Chapter Outline
12.1 INTRODUCTION
The term communication in simple words means sending or receiving information. In ancient times, people used the beating of drums, smoke signals, mirrors reflecting sunlight, homing pigeons, and so on to send messages. Another way of long distance communication was the use of homing pigeons to carry messages. With the advancement in science and technology, various devices were invented for communication. Telegraph was one of the most prevalent ways of data communication ...
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