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I personally need to review from my previous readings ccna cisco 200 301 on TCP/IP like the OSI layer model and the specifics of bit placement in relation to addressing.  This book goes really in depth in parts and I'm very looking forward to digging in!  You will get your money's worth.  Maybe too much information, but I'd rather have more than less.I would say that this book should be in your library and is a must buy for people wanting to dig into TCP/IP to understand how it all works. ccna cisco 200 301 No hesitation recommending this book.