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All this mechanisms are used for congestion avoidance. QUESTION 55: When RED is used as a dropping mechanism to avoid a full queue, which problem is exhibited if the minimum threshold and the maximum threshold are too close in size? A. Queues fill and tail-drop drops packets. B. The mark probability denominator is set to zero. C. The default average queue size is rest to 512 packets. D. TCP global synchronization can occur. Answer: D Explanation: When congestion occurs, dropping affect most of the TCP sessions, which simultaneously back-off and then restart again.
C. When the software queue is empty. D. When the software queue has reached its MCC. Answer: C Explanation: The implementation of software queuing was optimized for periods when the interface is not congested. The software queuing system is bypassed whenever there is no packet in the software queue and there is room in the hardware queue. The software queue is, therefore, only used when data must wait to be placed into the hardware queue. Source: Cisco Queuing Mechanisms, Page 3-6 QUESTION 97: Which of the following statements regarding the queuing scheme of IP Real Time Transport Protocol (RTP) prioritization is valid?
The process can be split into the following steps: Step 1 Drop the new packet if the WFQ system is full (hold-queue limit reached) and the new packet has the worst finish time (the last in the entire system). Step 2 Drop the packet with the worst finish time in the WFQ system if the system is full. Enqueue the new packet Step 3 Drop the new packet if the queue, where the packet should be enqueued, is the longest (not in packets but in the finish time of the new packet) and there are more packets in the WFQ system than the CDT.