单选题Users report an intermittent degradation of sound on their IP phones. Which of the following woulda network administrator do to alleviate the problem?（）AUse plenum cablesBProvide fault tolerance for the switchCConfigure VLAN trunking on the switchDConfigure QoS
单选题
Users report an intermittent degradation of sound on their IP phones. Which of the following woulda network administrator do to alleviate the problem?（）
A
Use plenum cables
B
Provide fault tolerance for the switch
C
Configure VLAN trunking on the switch
D
Configure QoS
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