To Our Valued Readers:

Thank you for looking to Sybex for your Network+ exam prep needs. We at Sybex are proud of our reputation for providing certification candidates with the practical knowledge and skills needed to succeed in the highly competitive IT marketplace. Certification candidates have come to rely on Sybex for accurate and accessible instruction on today's crucial technologies.

Sybex serves as a participant member of CompTIA's Network+ Advisory Committee, and just as CompTIA is committed to establishing measurable standards for certifying individuals who will support today's complex network systems, Sybex is committed to providing those individuals with the skills needed to meet those standards.

The author and editors have worked hard to ensure that the updated fourth edition of the Network+ Study Guide you hold in your hands is comprehensive, in-depth, and pedagogically sound. We're confident that this book will exceed the demanding standards of the certification marketplace and help you, the Network+ certification candidate, succeed in your endeavors.

As always, your feedback is important to us. If you believe you've identified an error in the book, please visit the Customer Support section of the Wiley web site. And if you have general comments or suggestions, feel free to drop me a line directly at nedde@wiley.com. At Sybex we're continually striving to meet the needs of individuals preparing for certification exams.

Good luck in pursuit of your Network+ certification!

Neil Edde

Publisher—Certification

Sybex, an Imprint of Wiley