多项选择题
What are two major sources of delay that can be managed by QoS in voice-enabled networks？（）
A.propagation delay B.voice packet serialization delay C.congested egress queues D.header overhead E.packets dropped because of CRC errors
多项选择题 Whichtwostatementsaretrueaboutvoiceportsonarouter？（）
单项选择题 WhichstatementistrueaboutForeignExchangeStation（FXS）portsonarouter？（）
多项选择题 WhichtwostatementsaretrueaboutthedigitalaudioinaVoIPnetwork？（）
