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Computer Networks won't save one minute over the next year. It has no step-by-step procedures, no problem solving sections, and no butt-saving tricks. The only purpose it can serve at a downed site is as a shield against thrown objects from frustrated users. Normally, theoretical books like this one receive a quick skim and are promptly sent to my for-looks-only tome tomb. However, this isn't a normal theoretical book. It's fascinating. In fact, I read it not once but three times. Tanenbaum fills over 700 pages with everything I didn't know, or better still, only thought I knew about networks.
For example, let me tell you what Tanenbaum taught me about modems. I have over ten years trench tech UNIX experience. I've hooked up thousands of modems. I've written more chat scripts, custom dialers, and inittab entries than I have sense to count. I even silently considered myself a modem expert -- before reading Tanenbaum's book.
Being the "expert" that I was, I had used the term carrier many times. I had also used that term many times before my computer days. I worked my way through college at a commercial broadcast station. A broadcast transmitter superimposes audio onto a sine wave called the carrier. However, until I read Computer Networks, I never made the connection between modems and transmitters. Tanenbaum points out that a modem works very much like a commercial transmitter and then proceeds to describe the different types of modem modulation in amazingly great detail. I no longer consider myself a modem expert.
That's why I read this book three times. I learned something new on every page and unlearned at least one misunderstanding in every chapter. I saw the gestalt between seemingly dissimilar things like modems and radio stations. The breadth and depth of the book yielded fresh fruit on every reading.
The book is well organized. Tanenbaum uses a modified ISO OSI (Open Systems Interconnection) reference model as a template for the book. While he drops the session and presentation layers, he leaves the physical, data link, network, transport, and application layers in his reference model. The explanation starts with the physical layer in chapter two and ends with the application layer in the last chapter. This bottom-up explanation is logical and easy to follow.
While the concepts could have been explained with the warmth of a legal brief, Tanenbaum has a gift for explaining them in an entertaining, conversational manner. True, everything must have an ROI. Sometimes, however, when it's entertaining enough, the sole joy of learning is enough of a return.
-- Don Bryson (dbryson@tclock.com )
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Explanation of ERCB rating scale: No stars = unacceptable, 1 Star = marginal, 2 Stars = average, 3 Stars = above average, 4 Stars = exceptional.