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CEH Certified Ethical Hacker Practice Exams, Second Edition, 2nd Edition by Matt Walker

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1.imageD. Zero day means there has been no time to work on a solution. The bad thing is that the discovery by security personnel of the existing vulnerability doesn’t mean it just magically popped up—it means it’s been there without the good guy’s knowledge and could have already been exploited.
imageA, B, and C are incorrect. Input validation refers to verifying that a user’s entry into a form or field contains only what the form or field was designed ...

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