The update to Data Communications And Networking by Behrouz Forouzan provides a thorough introduction to the concepts that underlie networking technology. This update provides two new chapters on topics of growing importance. Chapter 26 covers VLANs and VPNs, and chapter 27 covers the increasingly important topic of network security.

Forouzan's approach is accessible to students without technical backgrounds, and also provides material comprehensive enough to challenge the more experienced student. The seven-layer OSI model is used as a framework to provide the background necessary for explaining networking theory and showing interlying dependencies.

The second edition of Forouzan's Data Communications and Networking includes new exercises and some more challenging ones. In addition, he has increased coverage of some new topics in networking such as some of the new encoding systems, fast Ethernet, 100VganyLan, ADSL and DSL.

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