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Rita's 7th book is almost identical to the 4th edition I got for $4 cisco ccna 200 301 en español. In preparation for the test I read Rita's book twice, and Andy Crowes book twice. I also took the free pmstudy.com test cisco ccna 200 301 en español. Not going to make you an expert, but with the security field exploding, it certainly would not hurt you to pick up this book, whether you want the Sec+ cert or not.