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单选题
A user is unable to connect to the network. A network technician is able to determine that there is a problem on the switch. All other users on that switch are able to connect successfully to the network. Which of the following is a probable cause？（）
A
Switching loop is occurring on the switch.
B
Wrong subnet mask on the switch.
C
Incorrect SNMP settings on the switch.
D
Port is misconfigured on the switch.
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