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Title: Informative, but not as clear as it could be
Review: I found this book to be informative, but I sometimes had trouble understanding what they where saying. I found The Concise Guide to DNS and BIND by Nicolai Langfeldt to be more understandable in some places. If you have a good grasp of other parts of unix system administration, this book would most likely be fine. If you are more of a beginner and only want one book, get The Concise Guide. However, I recommend getting both, because they supplement each other very well.
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