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CompTIA Security+ All-in-One Exam Guide, Third Edition by Chuck Cothren, Roger Davis, Dwayne Williams, Gregory White, Wm. Arthur Conklin

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The Security Problem

The problem that faces professionals charged with securing a company’s network can be stated rather simply: Physical access negates all other security measures. No matter how impenetrable the firewall and intrusion detection system (IDS), if an attacker can find a way to walk up to and touch a server, he can break into it. The more remarkable thing is that gaining physical access to a number of machines is not that difficult.

Consider that most network security measures are, from necessity, directed at protecting a company from the Internet. This fact results in a lot of companies allowing any kind of traffic on the local area network (LAN). So if an attacker attempts to gain access to a server over the Internet and fails, ...

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