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單項選擇題

Refer to the exhibit. You would like to guarantee 7 Mb/s for FTP traffic in your LAN, as it seems that peer-to-peer traffic is taking up a large amount of bandwidth. When testing the configuration, you notice that FTP traffic doesn't reach 7 Mb/s. What is the problem?()

A.The Ethernet interface should have keepalives enabled.
B.The duplex settings are wrong on the Ethernet interface.
C.The qos pre-classify command should be removed from the tunnel interfaces.
D.the priority queue for the voice class is probably taking all the bandwidth.
E.there are probably not enough interface buffers;they should be tuned.

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