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There is FAR more social engineering today than actual hacking. This isn't the 80s.

Backtrack is a tool than every network admin should have. Penetration tests, actually following best practices, and constant monitoring and vigilance will get you as safe as you can be on a network. Make friends with your local university's computer science department. You'll find a load of students who love looking for this stuff. They've helped plug holes where I work.