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
Which two of these Metro Internet services map to E-LAN services that are defined by the MEF?（）

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
Which three of these Metro Ethernet services map to E-Line services that are defined by the 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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