Valid 400-101 Dumps shared by ExamDiscuss.com for Helping Passing 400-101 Exam! ExamDiscuss.com now offer the newest 400-101 exam dumps, the ExamDiscuss.com 400-101 exam questions have been updated and answers have been corrected get the newest ExamDiscuss.com 400-101 dumps with Test Engine here:
Which congestion-avoidance or congestion-management technique can cause global synchronization?
Correct Answer: A
Explanation/Reference: Explanation: Tail Drop Tail drop treats all traffic equally and does not differentiate between classes of service. Queues fill during periods of congestion. When the output queue is full and tail drop is in effect, packets are dropped until the congestion is eliminated and the queue is no longer full. Weighted Random Early Detection WRED avoids the globalization problems that occur when tail drop is used as the congestion avoidance mechanism on the router. Global synchronization occurs as waves of congestion crest only to be followed by troughs during which the transmission link is not fully utilized. Global synchronization of TCP hosts, for example, can occur because packets are dropped all at once. Global synchronization manifests when multiple TCP hosts reduce their transmission rates in response to packet dropping, then increase their transmission rates once again when the congestion is reduced. ReferencE. http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcfconav.html#wp1002