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Like the book itself says, ccna certification study guide volume 2 exam 200 301 it will be helpful (but not necessary) if you are already familiar with CompTIA Network+ material.  Being familiar with the Network+ material will simply help one expedite through the foundational networking concepts that are discussed throughout this book. If you are not familiar with the Network+ material, do not worry about it. ccna certification study guide volume 2 exam 200 301