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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.

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