Which of the following is true about the MPLS header and its EXP field size？（）
- A、The MPLS header is 2 bytes，and the EXP field is 3 bits long.
- B、The MPLS header is 1 byte，and the EXP field is 3 bits long.
- C、The MPLS header is 4 bytes，and the EXP field is 3 bits long.
- D、The MPLS header is 3 bytes，and the EXP field is 3 bits long.
正确答案:C
答案解析:有
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