Business Data Communications and Networking, Third Edition includes twelve core chapters instead of the second edition's eight. At the request of adopters and other reviewers, the author divided several of the longer core chapters from the second edition into two chapters in the third edition. The basic flow remains the same, although there are changes in emphasis in response to market trends and adopter comments.Technologies come and go rapidly in networking, and although the book covers general networking principles, it illustrates them using the latest technologies. Updating these technologies results in the greatest portion of changes from the second to third edition. In addition to these updates, the author has expanded coverage of and emphasis on topics such as Quality of Service; LAN Switching; Product Selection, Procurement, and Cost Analysis; Security; Windows Networking Setup; Wireless Communication and New Access Devices; Web-Enabled Database Access; Frame Relay; and Systems Administration