Mike Meyers, CompTIA A+®, CompTIA Network+, CompTIA Security+®, is the industry’s leading authority on CompTIA certifications and the bestselling author of nine editions of CompTIA A+ Certification All-in-One Exam Guide. He is the president and founder of Total Seminars, LLC, a major provider of PC and network repair seminars for thousands of organizations throughout the world, and a member of CompTIA.Jonathan S. Weissman, CompTIA A+, CompTIA Network+, CompTIA Security+, CCNP®, CHFITM, CEHTM, is a tenured associate professor and IT Program Coordinator in the Department of Computing Sciences at Finger Lakes Community College, and a senior lecturer in the Department of Computing Security at Rochester Institute of Technology. In addition, he does networking and cybersecurity consulting, and serves as author and technical editor for many industry textbooks.