VOIPisbeingimplementedintheCompanynetworkandyouneedtoassesstheneedforQoS.WhichofthefollowingnetworkproblemswouldindicateaneedtoimplementQoSfeatures？（）

A.Mis-routedpackets
B.Excessjitter
C.Delayofcriticaltraffic
D.Packetlossduetocongestion
E.Datalinklayerbroadcaststorms
F.FTPconnectionsunsuccessful

【参考答案】

B, C, D