多选题What two features in Cisco switches help prevent Layer 2 loops？（）AUniDirectional Link DetectionBHot Standby Router ProtocolCVirtual Router Redundancy ProtocolDPortFastEroot guardFloop guard
多选题
What two features in Cisco switches help prevent Layer 2 loops？（）
A
UniDirectional Link Detection
B
Hot Standby Router Protocol
C
Virtual Router Redundancy Protocol
D
PortFast
E
root guard
F
loop guard
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