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This is the first unit of our course on Fundamentals of Computer Networks. It will introduce you to some of the basic concepts of data communication and computer networking. In other words, though this unit we would like to explain the “What, Why, When, How, Where” of data communication. In the beginning, you will be introduced with the concept of communication and “communication system”. Once you understand the communication system and its components, we think other areas will be simpler for you. Different forms of data communication are further introduced to you in this unit. Next, we will discuss about various modes of communications. This unit will eventually cover an introduction to computer networking, networking protocols and standards, those are necessary for any effective communication. In the end of our unit, we will discuss various applications of data communication and computer networking.

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