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Bottom line up front, ccna 200 301 volume 2 free download if you're taking the Security+ and aren't a full-time IT security professional, you need this book and some practice tests that simulate Security+ test questions.  Even if you are in an IT security position, I still suggest at least reading this book if you need to take this exam.  I have a MS in Cybersecurity/Critical Infrastructure ccna 200 301 volume 2 free download