单选题A metro Ethernet user is connected using a PPP over Ethernet service.How many Layer 2 headers are attached to each IP datagram?（）A1B2C3D4
单选题
A metro Ethernet user is connected using a PPP over Ethernet service.How many Layer 2 headers are attached to each IP datagram?（）
A
1
B
2
C
3
D
4
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