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Network security depends on a number of factors. And a common characteristic of these factors is that they are dynamic in nature. Such factors include new vulnerabilities and threats, the network policy structure and traffic. These factors can be divided into two broad categories. Network risk and service risk. As the name implies, the former one corresponds to risk associated with the network policy whereas the later one depends on the services and softwares running on the system. Therefore, evaluating security from both the service and policy perspective can allow the management system to make decisions regarding how a system should be changed to enhance security as par the management objective.
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