WhatisoneofthereasonsthatcustomQoSACLsarerecommendedoverautomaticQoSwhen configuringportsonaCatalyst
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A.79xxIPphonesdonotautomaticallymarkvoicepacketswithnon-zeroDSCPvalues.
B.79xxIPphonesdonotmarkprotocolpacketssuchasDHCP,DNS,orTFTPwithnon-zero DSCPvalues.
C.79xxIPphonesdonotmarkvoicepacketswithoptimalDSCPvalues.
D.79xxIPphonesuseacustomprotocoltocommunicateCDPinformationtotheswitch.
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