Business Data Communications And Networking, 8th Ed 

Completely updated, the best-selling business networking reference returns. The eighth edition includes the changes necessary for the fast-paced networking environment. While technologies and applications change rapidly, the fundamental concepts evolve much more slowly; they provide the foundation from which new technologies and applications can be understood, evaluated, and compared. The new edition features a chapter on wireless LANS, an expansion of the security chapter to include more on security design and new technologies, and more coverage of technology design material on network design including a selection of technologies and best practices for network design.  This book is the market leader known for its technical accuracy and cutting-edge orientation.