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Cisco A Beginner’s Guide Fifth Edition by Anthony Velte, Toby Velte

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CHAPTER 8 Security Overview
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The concept of network security may seem somewhat of a moving target—or several moving targets. When we talk about “security,” we know what we want, but describing it and making it happen can be different matters altogether. Network security has a natural conflict with network connectivity. The more an autonomous system opens itself up, the more risk it takes on. This, in turn, requires that more effort be applied ...

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