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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 C. Voice Call Admission Control Reference

Suppose that you and a passenger are inside a vehicle traveling on a northbound highway. The highway consists of four regular lanes and one high-occupancy-vehicle (HOV) lane. To gain entry into the HOV lane, your vehicle must contain two or more people. In this instance, the HOV lane represents a priority queue, whereas the remaining four lanes represent lower-priority queues. As traffic begins to build in the four regular lanes, you decide to merge into the HOV lane. Over the next few miles/kilometers, the HOV lane maintains a constant rate of speed while the four regular lanes begin to stall. You are now enjoying the benefits of a priority queue. As you continue traveling northbound, you notice ...

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