Glen E. Clarke, MCSE, MCDBA, MCSD, CompTIA A+, CompTIA Network+, CompTIA Security+, works as a technical trainer and consultant for GigaBlink Technologies, Inc., a computer training and consulting company where he teaches courses on Windows, SQL Server, Exchange Server, CompTIA A+, Visual Basic, ASP, and security-related topics. Clarke a co-author of CompTIA Security+ Certification Practice Exams and Mike Meyers’ CompTIA Network+ Certification Passport, Third Edition.