The best things about this book are the bright graphics, the breezy writing style, and the simple language used to explain the concepts.
However, I got very frustrated that the majority of the book was a Jackanory about telephones and how Bell beat someone else to the patent. The actual 'meat' of the topic was, in comparison, very hurriedly dealt with. I felt it covered Networks in a very superficial way. The authors seemed to run out of steam after Ch6.
So this is a great book to catch your initial flavour of what's involved in networks, but it certainly does not contain enough detail to help you for even the most rudimentary study in networks. This is a great pity, as I feel this could have been a great learning aid had the book dealt with networks the way it did the telephone!
Finally, I was irritated by the poor quality of the book - many pages were not even divided at the top, which meant that many tore as I opened the book, new from its cellophane wrapper. This means I cannot sell it on. Beware!