5. Security

Security is an ever-growing field in the world of computer repair. A good working knowledge of attacks and defenses is a must in the IT industry. Security is one of the smaller domains in the CompTIA A+ Exams, but it still accounts for 8 percent of the 220-701 Essentials Exam and 13 percent of the 220-702 Practical Applications Exam. Figure 5-1 shows a layered defensive strategy that is designed to protect the user and data. Notice that the first line of defense is network based, the second line is on the local PC (host), and the third line of defense is the user.

Figure 5-1. Layered Defense

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