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Rating: 
Summary: Must have reference for LDAP and DNS
Review: I found this book to provide fantastic bookshelf reference on various directory technologies, including LDAP and DNS. It has been especially helpful to read the insight into these protocols, as well as the concise discussions on text-based directory protocols such as Finger, Whois, and Whois++. The book is laced with examples that help the reader get an appreciation of the intricacies that these protocols have to offer. This is a must buy for your reference shelf.
Rating: 
Summary: Good work
Review: I was hired to become a Java/LDAP expert in a company and was given some material by the company to begin with. I quickly noticed that some of the material available on LDAP is not very good. I had two problems. Some books that are considered 'bibles' in this field are just too thick that I would ever have enough time to go through them. I have a busy schedule. And other books had a different problem, they were quite spesific (e.g. only showed programming LDAP with a single proprietary API and nothing else).When I got really frustrated I went and bought this book on my own and thank god I did. This book is an excellent coverage of all the main directory topics and it does it in less pages than any of the 'bibles'. Yet it manages to go into much detail about actual protocols, layers and encoding issues. I highly recommend this book as the first (and maybe the only) book for anyone working with directories. I did find one problem with this book, that dropped one star. The index is not good enough - often I found myself looking for a term or word that just wasn't there. I wrote to the author about it and he said he agreed. Many times I was able to find the info in the book but not mentioned in the index and it was frustrating a couple of times when I wasn't sure where in the book would the term be explained, if it was there at all.
Rating: 
Summary: Don't waste your money on this book!
Review: This book contains too much errors and not enough structure to be of use for someone that really wants to know about Internet directories in general and LDAP in particular. The text just babbles on, mixing ASN.1 encoding details with data model descriptions with communication protocols. Also, many of the examples in the book contain errors and/or do not correspond to the text referring to them. The book does give you an overview of different types of Internet directories, but it contains too much distracting details to be advised for that purpose. I bought this book because of some enthousiastic reviews here at Amazon, but I was greatly disappointed.
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