Todd Lammle (Evergreen CO), Network+, CCSI, CCNA, CCNP, is the networking authority. He has been involved in computers and networking with Fortune 500 companies for almost 30 years. Todd is President of GlobalNet System Solutions, Inc., a networking integration and training firm, and is the bestselling author of numerous titles, including the popular CompTIA Network+ Study Guide. Todd has over 900,000 copies of his books in print. He can be reached through his web site at www.lammle.com. Jon Buhagiar (Oakdale, PA), Network+, A+, CCNA, MCSA, MCSE, BS/ITM, is Supervisor of Network Operations at Pittsburgh Technical Institute. In addition to teaching, he has been creating course content for the past 17 years. Some of his more recent work can be found on Youtube at www.youtube.com/networkedminds. Craig Zacker (Lititz, PA), Network+, is the author or co-author of dozens of books, manuals, articles, and web sites on computer and networking topics. He has also been an English professor, an editor, a network administrator, a webmaster, a corporate trainer, a technical support engineer, a minicomputer operator, a literature and philosophy student, a library clerk, a photographic darkroom technician, a shipping clerk, and a newspaper boy.