单选题A user has no network connectivity. A check of the associated port indicates that the interface is up，the line protocol is down. Which item would most likely cause this problem？（）ASpeed mismatchBIncorrect encapsulationCMTU set too lowDDuplex mismatch
单选题
A user has no network connectivity. A check of the associated port indicates that the interface is up，the line protocol is down. Which item would most likely cause this problem？（）
A
Speed mismatch
B
Incorrect encapsulation
C
MTU set too low
D
Duplex mismatch
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