This book is now in its fifth edition. Each edition has corresponded to a dif- ferent phase in the way computer networks were used. When the first edition ap- peared in 1980, networks were an academic curiosity. When the second edition appeared in 1988, networks were used by universities and large businesses. When the third edition appeared in 1996, computer networks, especially the Internet, had become a daily reality for millions of people. By the fourth edition, in 2003, wire- less networks and mobile computers had become commonplace for accessing the Web and the Internet. Now, in the fifth edition, networks are about content dis- tribution (especially videos using CDNs and peer-to-peer networks) and mobile phones are small computers on the Internet.

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