Copyright by J. Michael Stewart

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Chapter 4. Network Security Threats and Issues

NETWORK SECURITY IS UNDER CONSTANT ATTACK by threats both internal and external, ranging from disgruntled employees to world-wide hackers. There's no perfect defense because hackers are able to bypass, compromise, or evade almost every safeguard, countermeasure, and security control. Hackers are constantly developing new techniques of attack, writing new exploits, and discovering new vulnerabilities. Network security is a task of constant vigilance, not a project to complete. It's a job that's never done.

Why is understanding hacking, exploitation, vulnerabilities, and attacks critically important? As the sixth century B.C. Chinese general and author Sun Tzu stated in his famous military text The Art ...

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