多项选择题
Which two devices can interfere with the operation of a wireless network because they operate on similar frequencies? (Choose two.)（）
A.copier B.microwave oven C.toaster D.cordless phone E.IP phone F.AM radio
单项选择题 WhichprotocolprovidesamethodofsharingVLANconfigurationinformationbetweenswitches?（）
多项选择题 Whichofthefollowingaretypesofflowcontrol?(Choosethree.)（）
单项选择题 Acknowledgements,sequencing,andflowcontrolarecharacteristicsofwhichOSIlayer?（）
