David Groth is President and Chief Consultant of Devarim Inc., of Fargo, North Dakota. He is the author of the best-selling A+ Complete Study Guide from Sybex, as well as the I-Net+ Study Guide. Groth holds many technical certifications, including Network+, A+, I-Net+, MCP, and CNI. Dorothy L. McGee, i-Net+, MCSE, CNE, is a computer professional with over 14 years in the industry.