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
相关考题
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单项选择题
BGPbestrouteselectionprocessisbasedonwhat？（）
A.lowest cost
B.highest bandwidth
C.lowest hop-count
D.path attributes
E.lowest delay -
多项选择题
WhichtwostatementsaretrueaboutRPFchecksinMSDP（MulticastSourceDiscoveryProtocol）？（）
A.It prevents message looping，Session Advertisement（SA）messages must be RPF checked
B.RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SM domain，which originated the SA
C.RPF checking Session Advertisement（SA）messages will cause message looping
D.RPF check should be done against the route to the source S of the corresponding PIM-SM domain -
单项选择题
ThemechanismsfordistributingLDPare：（）
A.LDP and RSVP
B.RSVP and CEF
C.CEF and the FIB table
D.UDP and IP
E.A and B
