David L. Prowse is a computer network specialist, author, and technical trainer. As a consultant, he installs and secures the latest in computer and networking technology. Over the past several years, he has authored several titles for Pearson Education, including the well-received CompTIA A+ Exam Cram. In addition, over the past decade he has taught CompTIA A+, Network+, and Security+ certification courses, both in the classroom and via the Internet. He runs the website www.davidlprowse.com, where he gladly answers questions from students and readers.
Aubrey Adams (CCNA, Security+) is an electronic and computer system engineering lecturer and Cisco Networking Academy instructor at Central Institute of Technology in Perth, Western Australia. Coming from a background in telecommunications design, with qualifications in electronic engineering and management and graduate diplomas in computing and education, he teaches across a range of computer systems and networking vocational education and training areas. Aubrey also authors Networking Academy curriculum and assessments and is a Cisco Press author and Pearson Education technical editor.