Pick the 4 valid ATM Cell Header fields：（）
- A、GFC-4 bits of generic flow control
- B、Forward-explicit congestion notification（FECN）
- C、VCI-16 bits of virtual channel identifier
- D、CLP-1 bit of congestion loss
- E、HEC-8 bit of header error control
- F、ATM Discard Eligibility（DE）bit
正确答案:A,B,D,E
答案解析:有
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