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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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RIPB
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OSPFB
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To achieve the goal， the Prevent failback option should be enabled in the Failover properties.B
To achieve the goal， the If resource fails， attempt restart on current node policy should be enabled for all APP01 resources. And then， the Maximum restarts for specified period should be set to 0.C
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