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Cisco Networks: Engineers’ Handbook of Routing, Switching, and Security with IOS, NX-OS, and ASA by Noel Rivera, Richard Bedwell, William Wilson, Chris Carthern

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CHAPTER 16

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Advanced Security

Before we start, let’s be realistic about the expectations that there cannot be a 100% secure information system (IS). There are too many factors to evaluate that are out of your control, including the human factor. Therefore, security is more of a trade-off art of balancing risk. It goes without saying that complex systems with millions of lines of code are harder to secure than simpler systems. Usually, there are oppositely proportional factors that contribute to the security of a system, such as flexibility vs. narrow scope, and factors that are directly proportional to security of the system, such as the time ...

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