Whichtwostatementsbestdescribespanning－treeBPDUprocessingforablockingport？（）

A.BPDUsthatenterablockingportarediscarded.
B.BPDUsthatenterablockingportareprocessed.
C.Loopguardputsaninterfaceintoaloop-inconsistentstatewhenBPDUsstopbeingreceivedonablockingport.
D.BPDUsareonlyprocessedonforwardingports.

【参考答案】

B, C