Wendell Odom, CCIE No. 1624, splits time between writing Cisco Press books and teaching Cisco authorized training for Skyline Advanced Technology Services (http: //www.skylineats.com). Wendell has worked in the networking arena for more than 25 years, with jobs in preand post-sales technical consulting, teaching, and course development. He is the author of all prior editions of the Cisco Press "CCNA Exam Certification Guides," most recently the two-book set "CCENT/CCNA ICND1 Official Exam Certification Guide"and "CCNA ICND2 Official Exam Certification Guide," Wendell has also authored several other titles, including the "CCIE Routing/Switching Written Exam Certification Guide," "QoS Exam Certification Guide," and "Computer Networking First-Step," all from Cisco Press.