When you design QoS on CE for an MPLS Layer 2 VPN， which three things should be considered？（）
- A、Layer 2 access link QoS design
- B、enterprise-to-service-provider mapping models
- C、Layer 3 link access QoS design
- D、service provider service level agreements
- E、Layer 2 link access load balancing
正确答案:A,B,D
答案解析:有
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