Thoroughly updated, this classic bestseller, now in its fourth edition, reflects the newest and most important networking technologies with a special emphasis on wireless networking. The material on wireless networks includes detailed coverage of 802.11, wireless local loops, 2G and 3G cellular networks, BluetoothTM, WAP, i-mode, and others. It prepares students to work with wireless technologies in networks of all sizes-both local and wide area networks. There is also lots of new material on applications, including the Web, Internet radio, voice over IP, and video on demand. Finally, an entirely new chapter is devoted exclusively to security to help students deal with one of the most crucial topics in networking today. Despite a large amount of material added on wireless networks, fixed networks have not been ignored-topics covered include ADLS, Internet over cable, gigabit Ethernet, peer-to-peer networks, NAT, and MPLS. Each chapter follows a consistent approach. The author first presents the key principles-underlying hardware at the physical layer up through the top-level application layer-and then illustrates them utilizing real-world examples drawn from the Internet and wireless networks, all in Tanenbaum's classic entertaining style.