WhatisoneofthereasonsthatcustomQoSACLsarerecommendedoverautomaticQoSwhen configuringportsonaCatalyst

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A.79xxIPphonesdonotautomaticallymarkvoicepacketswithnon-zeroDSCPvalues.

B.79xxIPphonesdonotmarkprotocolpacketssuchasDHCP,DNS,orTFTPwithnon-zero DSCPvalues.

C.79xxIPphonesdonotmarkvoicepacketswithoptimalDSCPvalues.

D.79xxIPphonesuseacustomprotocoltocommunicateCDPinformationtotheswitch.

参考答案:

参考C

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