单项选择题
A. Cannot be disabled
B. Cannot have the CoS changed
C. Can have "Packet Drop" enabled
D. Is multicast optimized
E. Can have the MTU changed
单项选择题 WhenbuildingaNICteam（virtualportchannel）betweenahostandapairofCiscoNexus5000SeriesSwitchesthatwillcarryFCoEtraffic，whatisthemaximumnumberofphysicallinksthatcanexistintheteam？（）
单项选择题 WhichstatementiscorrectaboutthenumberofavailableQoSsystemclassesinFCoE？（）
单项选择题 WhichmechanismdotheCNAandtheCiscoNexus5000SeriesSwitchesusetoprovidealosslessclassofEthernettraffic？（）