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【单选题】
You work as a network technician at Company.com， study the exhibit provided. You are implementing this QoS configuration to improve the bandwidth guarantees for traffic towards two servers， one with the IP address 5.5.5.5 and the other with the IP address 5.5.5.4. Even after the configuration is applied， performance does not seem to improve. Which will be the most likely cause of this problem？（）A.
The policy map mark has been applied on a half-duplex Ethernet interface；This is not supported.
B.
The policy map queue is configured on the wrong interface； it is applied on the Serial interface whereas traffic is going over the tunnel interface.
C.
The class maps are wrongly configured
D.
The ip nbar protocol-discover command cannot be configured together with a Service policyoutput on the serial interface.
E.
This is probably a software bug
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