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Cisco QOS Exam Certification Guide (IP Telephony Self-Study), Second Edition by Michael J. Cavanaugh, Wendell CCIE No. 1624 Odom

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Appendix B. Additional QoS Reference Materials

A few years ago, Cisco introduced a couple of different QoS courses, along with a couple of different QoS exams, called DQOS and QOS. The two exams had about 60 percent overlap with each other, but the DQOS exam and course focused more on Enterprises and VoIP, whereas the QoS exam and course focused more on QoS issues in Service Provider networks.

To support the exams, Cisco Press also came out with the first edition of this book, which focused on the DQOS exam, but included coverage of most of the topics on the QoS exam that weren’t also on the DQOS exam.

Later, mainly early in 2004, Cisco changed to have a single QoS course and exam (642-642). The two courses essentially merged, with some topics ...

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