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单项选择题 You’re a network administer and you issue the command （show port 3/1） on an Ethernet port. To  your surprise you notice a non-zero entry in the ’Giants’ column.  What could be the cause of this？ （）

A、 IEEE 802.1Q

B、 IEEE 802.10

C、 Misconfigured NIC

D、 User configuration

E、 All of the above

  • A

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