单项选择题
A.QoS classified at layer 3 using IP precedence or DSCP
B.Guaranteed rate service
C.Implemented using FIFO queues
D.All traffic has an equal chance of being dropped
多项选择题 TheCompanyisrollingoutCisco’sArchitectureforVoice，VideoandIntegratedData（AVVID）.WhichofthefollowingchoicesrepresentthefundamentalintelligentnetworkservicesinCisco’sAVVID？（）
多项选择题 WhichQoSmechanismscanyouuseonaconvergednetworktoimproveVoIPquality？（）
单项选择题 YouareanetworkadministratorofalargeinvestorrelationscompanythatusesaswitchednetworktocarrybothdataandIPtelephonyservices.WhyshouldyoucarryvoicetrafficonaseparateVLAN？（）