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Michael Valentine has worked in the IT field since 1996, specializing in network design and installation. His company provides contract instruction and small/medium business consultancy services, and specializes in Cisco Unified Communications (Collaboration) and Route/Switch classes. Mike is the author of the popular CCNA Exam Cram series and the CCNA Voice Official Certification Guide, and also served as Technical Editor for many other Cisco Press titles. His accessible, humorous, and effective teaching style has demystified Cisco for thousands of students since he began teaching in 2002. Mike received his Bachelor of Arts degree from the University of British Columbia and currently holds Cisco CCNA, CCDP, CCNP, CCVP, and CCSI No. 31461 certifications, among others.