問答題端口安全,問violation什么模式仍然允許轉(zhuǎn)發(fā)流量?

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5.單項(xiàng)選擇題Prior to 802.1w,Cisco implemented a number of proprietary enhancements to 802.1D to improve convergence in a Layer 2 network. Which statement is correct?()

A.Only UplinkFast and BackboneFast are specified in 802.1w;PortFast must be manually configured.
B.Only PortFast is specified in 802.1w;UplinkFast and BackboneFast must be manually configured.
C.None of the proprietary Cisco enhancements are specified in 802.1w.
D.PortFast,UplinkFast,and BackboneFast are specified in 802.1w.