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When the link type of the ONU port is Trunk , its processing method for upstream packets is _____ .
When the link type of the ONU port is Trunk , its processing method for upstream packets is _____ .
A . only allowed without Tag packets to pass through, and the packets add the default VLAN of Tag
B . Only allow the packets with the default LAN Tag to pass and go to the tag
C . for without receipt of the Tag message, add the default VLAN Tag ; for received with Tag packets forwarded directly
D . Only allow tagged messages to pass
Answer: C
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