多项选择题
Which two of these are characteristics of Metro Ethernet？（）
A. class of service B. bandwidth profiles C. user-network interface D. Ethernet LAN circuit attributes E. Ethernet virtual circuit attributes
多项选择题 WhichtwooftheseMetroInternetservicesmaptoE-LANservicesthataredefinedbytheMEF？（）
多项选择题 WhichthreeoftheseMetroEthernetservicesmaptoE-Lineservicesthataredefinedbythe MEF？（）
单项选择题 WhichoftheseisabenefitofusingNetworkAdmissionControlinsteadofCiscoIdentityBased NetworkingServices？（）
