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

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多项选择题
WhichtwooftheseMetroInternetservicesmaptoE-LANservicesthataredefinedbytheMEF？（）

A. Ethernet Private Line
B. Ethernet Wire Service
C. Ethernet Relay Service
D. Ethernet Multipoint Service
E. Ethernet Relay Multipoint Service
多项选择题
WhichthreeoftheseMetroEthernetservicesmaptoE-Lineservicesthataredefinedbythe MEF？（）

A. Ethernet Private Line
B. Ethernet Wire Service
C. Ethernet Relay Service
D. Ethernet Multipoint Service
E. Ethernet Relay Multipoint Service
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