Gary A. Donahue is a working consultant who has been in the computer industry for 25 years. Gary has worked as a programmer, mainframe administrator, Technical Assistance Center engineer, network administrator, network designer, and consultant. Gary has worked as the Director of Network Infrastructure for a national consulting company and has been the president of his own New Jersey consulting company; GAD Technologies. Having designed and built networks ranging from simple LANs to world-wide converged VoIP networks, Gary has worked with people from all levels of IT and management. From small local businesses to Fortune 500 clients Gary observed many misunderstandings regarding routing and switching technologies, even among people with high-level certifications. Gary's goal as a consultant has always been to help his clients understand the technology at hand. Over the years he has written many documents outlining complex technologies in order that others might better understand. Much of this knowledge has been transformed into this book. Being a teacher by nature, Gary enjoys the process of imparting newfound understanding to others. Gary has taught Tae Kwon Do, Photography and Astronomy both informally and through professional schools. Being someone who disdains boredom, Gary has many hobbies including amateur radio, astronomy, bicycling, computers of all kinds, gadgets, guitar, hiking, home theater, martial arts, photography, SCUBA diving, and competitive shooting. Gary is the owner of the Newf-Net Newfoundland Dog forum and is the author of the Newf-L F.A.Q.