多项选择题

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

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BGP best route selection process is based on what ？（）

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