Which two of these are characteristics of MPLS VPNs？ （）
- A、 Layer 3 MPLS VPNs can forward only IP packets
- B、 Layer 2 MPLS VPNs can forward any network protocol
- C、 MPL S label paths are automatically formed based on Layer 2 frames
- D、 Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 frames
- E、 In Layer 2 MPLS VPNS， the service provider controls the customer Layer 3 policies
正确答案:A,B
答案解析:有
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