综合布线系统检测时,对光纤布线应全部检测,双绞线布线以不低于()的比例进行随机抽样检测,抽样点必须包括最远布线点。
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In a high-availability network, which command, when placed on ports that have connected end stations, will allow you to prevent delays in service for end stations by placing a port in blocking mode?()
A. enable backbone fast
B. enable uplink fast
C. disable portfast
D. enable portfast