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Richard Clarke's experience in cybersecurity is virtually unmatched in the recent era ccna 200 301 questions.  He has no end of experience (and stories) to tell in both commercial and government arenas protecting networks and high visibility systems from attack. If you've been around IT for awhile nothing about the Security+ exam should surprise you.  If not, just study this book a little harder, and you'll pass ccna 200 301 questions.  I did with an 867.