单选题Which of the following is true about the MPLS header and its EXP field size？（）AThe MPLS header is 2 bytes，and the EXP field is 3 bits long.BThe MPLS header is 1 byte，and the EXP field is 3 bits long.CThe MPLS header is 4 bytes，and the EXP field is 3 bits long.DThe MPLS header is 3 bytes，and the EXP field is 3 bits long.
单选题
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.
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