单项选择题
A.RTP multiplexing is used to keep multiple phone conversations separate
B.RTP provides end-to-end delivery services for voice traffic
C.UDP is used to ensure a reliable transmission from sender to receiver
D.RTP is used to provide resource reservation for the voice stream
E.UDP provides multiplexing
单项选择题 Refer to the wxhibit . what QOS model should be used to reserve the requested bandwidth and delay needed for each allowed VOIP call regardless of changing networkconditions？（）
多项选择题 WhichtwoCiscorouterfunctionalplanesareprotectedbyControlPlanePolicing（COPP）？（）
多项选择题 WhataretwostepneededtodefineaQoSpolicyforatrafficclass？（）