Chris Crayton is a technical consultant, security consultant, and trainer. Formerly he worked as a networking instructor at Keiser College and as a network administrator for Protocol, an electronic customer relationship management (eCRM) company. Chris has authored several print and online books, including Microsoft Windows Vista 70-620 Exam Guide Short Cut (O’Reilly, 2007), CompTIA A+ Essentials 220-601 Exam Guide Short Cut (O’Reilly, 2007), A+ Adaptive Exams (Charles River Media, 2002), and The Security+ Exam Guide (Charles River Media, 2003). He holds MCSE, MCP+I, A+ and Network+ certifications.