单选题To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）AThe PRI field should contain the Cos value of 010BThe PRI field should contain the Cos value of 011CThe PRI field should contain the Cos value of 100DThe PRI field should contain the Cos value of 101EThe PRI field should contain the Cos value of 110FThe PRI field should contain the CoS value of 111
单选题
To provide quality of service （QoS） for voice traffic in an IEEE 802.1 q network， which class of service （CoS） value should be used in the 3-bit， user priority bits （PRI） field？ （）
A
The PRI field should contain the Cos value of 010
B
The PRI field should contain the Cos value of 011
C
The PRI field should contain the Cos value of 100
D
The PRI field should contain the Cos value of 101
E
The PRI field should contain the Cos value of 110
F
The PRI field should contain the CoS value of 111
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