The term network security defines a broad range of complex subjects. To understand the individual subjects and how they relate to each other, it is important for you to first look at the big picture and get an understanding of the importance of the entire concept. Ask yourself why you lock the door to your home. The answer is likely that you do not want someone to walk in and steal your stuff. You can think of network security in much the same fashion. Security is applied to your network to prevent unauthorized intrusions and theft or damage of property. In this case the "property" is "data." In this information age, data has become a very valuable commodity with both public and private organizations making the security of their assets a very high priority.
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