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This type of behavior is called starvation. Short or long bursts cause a FIFO queue to fill. Packets entering an almost full queue have to wait a long time before they can be transmitted. Another time, the queue might be empty causing packets of the same flow to experience almost no delay. Variation in delay is called jitter. In spite of all the drawbacks FIFO is still the most used queuing mechanism because of the following benefits: It is simple and fast. Most high-end routers with fast interfaces are not really challenged by the drawbacks mentioned earlier.

By default, unclassified packets are placed into the normal priority output queue. D. The high priority queue has a default queue limit of 20. Explanation: As mentioned previously, Priority Queuing suffers from the same drawbacks as FIFO queuing, except it is localized to four classes. Each class can experience starvation, delay and jitter if one or more flows in the class cause congestion. Furthermore, one higher-priority queue can cause all other queues to starve if it is congested. Priority Queuing requires manual configuration of classification.

Class maps are identified by case-sensitive names. Each class map contains one or more conditions that determine if the packet belongs to the class. There are two ways of processing conditions when there is more than one condition in a class map: Match all-all conditions have to be met to bind a packet to the class Match any-at least one condition has to be met to bind the packet to the class The default match strategy of class maps is "Match all". Source: Cisco IP QoS-Modular QoS CLI Classification, Page 8-6 QUESTION 81: Study the Exhibit below carefully: interface s0/0 custom-queue-list 5 !

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