I suppose a book like this is unlikely to please everyone who reads it. From my point of view, as someone who wanted to learn the basics of networking in general, I found bits of it interesting and useful, but many parts were pitched at too advanced a level for 'dummies'. I thought there was too much information on details, like configuring specific operating systems, and not enough on general concepts. Incidentally, I had previously considered the non-'All-in-One' version of the book, but it appeared to be the same as this one with some parts omitted (not always the case with Dummies books). ( )