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多选题
What are two QoS mechanisms that are used to prevent packet loss？（）
A
header compression
B
payload compression
C
low latency queuing （LLQ）
D
weighted random early detection （WRED）
E
traffic policing
F
traffic shaping
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单选题What accurately describes the usage of a Cisco AutoQoS command？（）A
on Catalyst switches， the show auto discovery qos command is used to display the data collected during the Auto-Discovery phaseB
on Catalyst switches， the show auto qos command is used to display packet statistics of all classes that are configured for all service policiesC
on Cisco routers， the show mls qos maps command is used to verify the CoS-to-DSCP maps for egress packet queuingD
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