延时继电器RTA、RTB、RTC、RTH、RTL、RTMF的绿灯指示的含义？
延时继电器绿色指示灯用于指示触点状态。
RTA、RTB、RTC、RTH、RTMF延时期间绿色指示灯闪烁；15、16触点闭合时绿色指示灯灭；15、18触点闭合时绿色指示灯亮。
RTL负载带电期间绿色指示灯闪烁。
Observe the diagram. RTC is the hub router and RTA and RTB are the spokes. There are no virtual circuits between the spoke locations. What is needed to successfully route traffic to the 11.11.11.0/24 network from RTA? （）
时间继电器是利用电磁或机械等原理实现触点延时接通或断开的自动控制电器。
During a recent OSPF election among three routers, RTA was elected the DR and RTB was elected the BDR, as seen in the graphic. Assume that RTA fails, and that RTB takes the place of
the DR whi le RTC becomes the new BDR. What will happen when RTA comes back online？（）
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