David L. Prowse is a computer network specialist, author, and technical trainer with 20 years experience in the technology field. As a consultant, he installs and secures the latest in computer and networking technology. Over the past decade, he has authored a dozen books and videos including the well-received CompTIA A+ Exam Cram. In addition, over the past decade he has taught CompTIA certification courses, both in the classroom, and via the Internet. He runs the website http://www.davidlprowse.com which includes lots of free extras, and where he gladly answers questions from students and readers.