单选题Which switch port error is an indication of duplex mismatches on 10/100/1000 IEEE 802.3u Gigabit Ethernet ports？（）AFCS errorsBRuntsCMultiple collisionsDAlignment errors
单选题
Which switch port error is an indication of duplex mismatches on 10/100/1000 IEEE 802.3u Gigabit Ethernet ports？（）
A
FCS errors
B
Runts
C
Multiple collisions
D
Alignment errors
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