单选题Which mechanism can you use to achieve sub-second failover for link failure detection when a switched Ethernet media is used and loss of signal is not supported by the link provider？（）AOSPF standard hellosBCisco Discovery Protocol link detectionCBidirectional Forwarding DetectionDFast Link PulseEautonegotiation
单选题
Which mechanism can you use to achieve sub-second failover for link failure detection when a switched Ethernet media is used and loss of signal is not supported by the link provider？（）
A
OSPF standard hellos
B
Cisco Discovery Protocol link detection
C
Bidirectional Forwarding Detection
D
Fast Link Pulse
E
autonegotiation
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