Cisco Press exam certi?¬?cation guides and preparation materials offer exceptional??”and
?¬‚exible??”access to the knowledge and information required to stay current in one??™s ?¬?eld of
expertise, or to gain new skills. Whether used to increase internetworking skills or as a
supplement to a formal certi?¬?cation preparation course, these materials offer networking
professionals the information and knowledge required to perform on-the-job tasks
pro?¬?ciently.
Developed in conjunction with the Cisco certi?¬?cations and training team, Cisco Press
books are the only self-study books authorized by Cisco, and they offer students a series of
exam practice tools and resource materials to help ensure that learners fully grasp the
concepts and information presented.
Additional authorized Cisco instructor-led courses, e-learning, labs, and simulations are
available exclusively from Cisco Learning Solutions Partners worldwide. To learn more,
visit http://www.cisco.com/go/training.
I hope you will ?¬?nd this guide to be an essential part of your exam preparation and
professional development, as well as a valuable addition to your personal library.
Drew Rosen
Manager, Learning & Development
Learning@Cisco
December 2007
xix
Introduction
Since the introduction of the personal computer in the early 1970s, businesses have found
more uses and applications for technology in the workplace.
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