Which command is used to determine if a host has logged in to the Fibre Channel fabric？ （）

多项选择题LosslessEthernetforFCoEisachievedthroughtheuseofwhichfeatures？（）

A. Priority flow control
B. Buffer-to-buffer credits
C. TCP retransmission
D. Ethernet checksum
E. QoS policies

单项选择题WhichstatementistrueaboutTheQoSClassFibreChannel？（）

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？（）

A. 1
B. 2
C. 4
D. 5
E. 16

单项选择题WhichstatementiscorrectaboutthenumberofavailableQoSsystemclassesinFCoE？（）

A. It’s hard-set and cannot be disabled
B. It’s configurable， with an upper limit of 16
C. It’s hard-set but cannot disable best-effort and Fibre Channel
D. It’s hard-set but can disable all but one class
E. It’s configurable with an upper limit of eight

单项选择题WhichmechanismdotheCNAandtheCiscoNexus5000SeriesSwitchesusetoprovidealosslessclassofEthernettraffic？（）

A. LLDP
B. LACP
C. PFC
D. FIP