The correct answer is: b. it provides security against lapses in your perimeter defenses, flawed products, and both new and old vulnerabilities.
Security monitoring is seen by many security experts as a much more realistic way of providing resilient security. It makes a network less dependent on keeping patches up to date, and you're more likely to discover and catch a hacker -- regardless of what vulnerability is exploited to gain access.
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This was first published in June 2005