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Computer Networking: A Top-Down Approach Featuring the Internet Review by Rebecca A. Ward
Data Communications
Got this for a college class. Actually needed 5th edition, but for the most part, this is the same book (some of the questions at the end of the chapter are different). For the most part though, the chapters themselves are the same, so it is nice to have a second book so that I can leave one at work and read during my lunch hour without carrying it back and forth. The author is fairly clear, though some of the metaphors are a little strange.