单项选择题

Refer to the exhibit. Which of these is applied to the Bearer class？（）

A.WRED
B.traffic shaping
C.packet marking
D.packet classification
E.FIFO queuing within the class

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单项选择题
Refer to the exhibit. Which switching feature is being tested？（）

A.loop guard
B.PortFast
C.root guard
D.BDPU guard
单项选择题
Refer to the exhibit. Voice traffic is marked  precedence 5.  How much bandwidth is allocated for voice traffic during periods of congestion？（）

A.a minimum of 48 kb/s
B.a maximum of 48 kb/s
C.a minimum of 48% of the available bandwidth
D.a maximum of 48% of the available bandwidth
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