单选题When an MPLS Layer 2 VPN runs in the hub-and-spoke model， where is QoS implemented？（）Ahub and spokeBPECCEDhubEspoke
单选题
When an MPLS Layer 2 VPN runs in the hub-and-spoke model， where is QoS implemented？（）
A
hub and spoke
B
PE
C
CE
D
hub
E
spoke
参考解析
解析：
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