题型：单选题 标签：故障切换
题目：
40、 What is the default number of seconds before a monitored interface availability status is changed causing a failover to occur?默认情况下，一个被监控的接口在状态发生改变多少秒后就会导致故障切换的情形?
A. 10
B. 30
C. 500
D. 25
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