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单选题
You need to troubleshoot an issue on the switched LAN. When you issue a command "show port3/1" on a switch， you observe the Giants column has a non-zero entry. What could cause this？（）
A
IEEE 802.10
B
Misconfigured NIC
C
User configuration
D
IEEE 802.1Q
E
None of the other alternatives apply
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考题
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