Where is the MPLS label imposed？（）
- A、after the Layer 3 header and before the Layer 2 payload
- B、after the Layer 3 header and before the Layer 4 payload
- C、after the Layer 2 header and before the Layer 1 payload
- D、after the Layer 1 header and before the Layer 2 payload
- E、after the Layer 2 header and before the Layer 3 payload
正确答案:E
答案解析:有
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