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單項選擇題

You are the network administrator at Company and switch R1 is configured as shown below：  Interface gigethernet 0/1  Switchport mode trunk  
Switchport trunk encapsulation dot1q  Switchport trunk native vlan 5  
If untagged frames are arriving on interface gigethernet 0/1 of R1， 
which of the following statement  are correct？（）

A. Untagged frames are automatically assumed to be in VLAN 5.
B. Untagged frames are defaulted to VLAN 1 traffic.
C. Untagged frames are dropped because all packets are tagged when dot1q trunked.
D. Untagged frames are determined on the other switch
E. Untagged frames are not supported on 802.1Q trunks.

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