多选题Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning-Tree plus?（）APortFastBUplinkFastCloop guardDroot guardEBPDU guardFBackboneFast
多选题
Which four Cisco Spanning Tree Protocol enhancements are supported with rapid per-VLAN Spanning-Tree plus?（）
A
PortFast
B
UplinkFast
C
loop guard
D
root guard
E
BPDU guard
F
BackboneFast
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