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The ccna official cert guide 200 301 and courseware are an excellent basic introduction to the overall computing world. I may not represent the "typical" target for this book as I purchased it strictly to review CompTIA's Windows troubleshooting protocols; I'm sure my mindset of "let's nuke the entire site from orbit, it's the only way to be sure" when a computer encounters any moderately complex problem is probably not the most conventional (at my job I've found it more practical to keep a backup image on the network). ccna official cert guide 200 301