CompTIA Network+

David Groth, A+, Network+, Server+, Security+, MCSE, CNI, is a full-time author and consultant. He is the author of many of Sybex's bestselling certification study guides as well as Cabling: The Complete Guide to Network Wiring.

Toby Skandier, A+, Network+, i-Net+, Server+, is a technical education developer for Embarq. He has coauthored numerous books for Sybex, including the bestselling CompTIA A+ Complete Study Guide and Network+ Study Guide.

Bill Ferguson, Network+, MCT, has been in the computer industry for over 15 years. He worked as a Certified Technical Trainer with ExecuTrain for many years and now runs his own training and consulting company. In addition, Bill writes and produces technical training videos for Virtual Training Company, Inc. and Specialized Solutions, Inc.