多项选择题
What are three factors used to determine the amount of bandwidth that is required for a single VoIP call？（）
A.codec B.link speed C.Layer 2 encapsulation D.packet overhead （IP/UDP/RTP） E.link delay F.total number of simultaneous calls that are allowed
单项选择题 WhichstatementdescribesthedistributedcallcontrolmodelinVoIPnetworks？（）
多项选择题 WhichtwopairingsmatchtheapplicationwiththecorrectCosvalue？（）
多项选择题 Whichtwooptionscanbeusedastrafficdescriptorswhenclassifyingandmarkingtraffic？（）
