A computer can be considered secure if it and its software can be depended upon. This does not mean that it is absolutely impenetrable to crackers, viruses and other forms of unauthorized entry. The only computer that is absolutely secure is unplugged and locked in a vault somewhere. Security is a responsibility shared between the organization who owns the system, the system administrator, anyone who uses the system, and anyone who walks in the room where the system is. Security can be roughly divided into four areas of concern; accounts, networks, file systems, and physical security. Physical security is the first line of defense. All the network, file system and account security in the world will do little good if someone walks off with the computer. Physical security includes: Inhibiting theft and vandalism controlling the environment Limiting access to system components Restricting access to backup tapes.
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