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Certification resources on the Web are plentiful, and vendor sites are the best places to start. Many refer you to authorized training centers, sell courseware online, or, in some cases, even provide free, practice tests, and Web-based lessons.
Vendor Certification
Books on Certification
Certification by Subject - A+ | CNA | CNE | Java | MCSD | MCSE
Certification Essentials - The A+ Exam | Cisco Press | CCNA | CNE | Java Developers | Java Programmers
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