Exam -Pack: 642-642 (QOS) is part of the Cisco Certified Voice Professional, Cisco IP Telephony Design Specialist, Cisco IP Telephony Express Specialist, Cisco IP Telephony Operations Specialist and Cisco IP Telephony Support Specialist certifications . A thorough understanding of Cisco networking such as a CCNA certification or equivalent knowledge is recommended before viewing these videos. The training contains 14 videos providing more than 7 hours of instruction
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