多项选择题

Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？（）

A. Packets can arrive out of order.
B. Packets must take the same path to the destination.
C. Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.
D. Packets can experience varying delays across the network.
E. Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.

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For delay sensitive traffic， what are the three best ways that are used to prevent packet loss？（）

A. Compress payload.
B. Use header compression.
C. Increase link capacity.
D. Use random early detection.
E. Guarantee bandwidth to fragile flows.
F. Implement network-based application recognition.

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Which three functions are associated with a Cisco Unified CallManager？（）

A. connects traditional telephony devices to voice over IP infrastructure
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Which two characteristics are common between traffic policing and traffic shaping？（）

A. The rate of traffic is measured and compared to a configured policy.
B. Classification is used to differentiate traffic.
C. Traffic is marked and sent out according to priority.
D. Both can be applied to inbound and outbound traffic.
E. Both buffer traffic to ensure a predetermined traffic rate.
F. Both drop traffic that is above a predetermined traffic rate.

Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）

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Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？（）