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单选题
What is one of the reasons that custom QoS ACLs are recommended over automatic QoS when configuring ports on a Catalyst 6500 for use with IP phones？（）
A
79xx IP phones do not automatically mark voice packets with non-zero DSCP values.
B
79xx IP phones do not mark protocol packets such as DHCP， DNS， or TFTP with non-zero DSCP values.
C
79xx IP phones do not mark voice packets with optimal DSCP values.
D
79xx IP phones use a custom protocol to communicate CDP information to the switch.
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更多 “单选题What is one of the reasons that custom QoS ACLs are recommended over automatic QoS when configuring ports on a Catalyst 6500 for use with IP phones？（）A 79xx IP phones do not automatically mark voice packets with non-zero DSCP values.B 79xx IP phones do not mark protocol packets such as DHCP， DNS， or TFTP with non-zero DSCP values.C 79xx IP phones do not mark voice packets with optimal DSCP values.D 79xx IP phones use a custom protocol to communicate CDP information to the switch.” 相关考题
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问答题What field in IP packet is used for classification by QOS？
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