6.1. Understanding Physical and Network Security

Physical security measures prevent your systems from being accessed in unauthorized ways, primarily by preventing an unauthorized user from physically touching a system or device. Most networked systems have developed high levels of sophistication and security from outside intruders. However, these systems are generally vulnerable to internal attacks, sabotage, and misuse. If an intruder has physical access to your systems, you should never consider them to be secure.

The following sections discuss the aspects of physical security that affect your environment, including access controls, social engineering, and the environment.

6.1.1. Implementing Access Control

Access control is a critical part ...

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