The CISCO QOS 642-642 exam is one of the qualifying exams for the Cisco QOS Certified Internetwork Professional, Cisco QOS Certified Voice Professional, Cisco QOS IP Telephony Design Specialist, Cisco QOS IP Telephony Express Specialist, Cisco QOS IP Telephony Operations Specialist, and Cisco QOS IP Telephony Support Specialist certifications. The exam will certify that the successful candidate has knowledge and skills necessary to configure and troubleshoot Cisco QOS IOS routers running Quality of Service protocols in Service Provider and Enterprise environments. The exam covers topics on IP CISCO QOS, classification and marking Mechanisms, queuing mechanisms, traffic shaping and policing mechanisms, congestion avoidance mechanisms, link efficiency mechanisms, modular CISCO QOS command line interface, and CISCO QOS Best Practices.

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