[多选] In an Ethernet network, under what two scenarios can devices transmit?()
A . when they receive a special token B . when there is a carrier C . when they detect no other devices are sending D . when the medium is idle E . when the server grants acce
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In a frame ,the MPLS label is imposed(). After the Layer3 header and before Layer2 header。 After the Layer2 header and before Layer3 header。 Within the Layer 3 header。 Before the layer 2 header。
在加计数器的设置输入S端的(),将PV端指定的预置值送入计数器值。 高电平。 低电平。 上升沿。 下降沿。
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In an Ethernet network, under what two scenarios can devices transmit?()