多項選擇題

Which three statements are true about the data traffic characteristics of voice traffic？（）

A.latency must be kept below 150 ms
B.latency is not a concern as long as jitter is kept below 30 ms
C.voice packets do not require a specific type of queuing
D.voice packets are rather small
E.voice packets require TCP for rapid retransmission of dropped packets
F.voice packets require a fairly constant bandwidth reserved for voice control traffic as well as forthe voice payload

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多項選擇題

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

多項選擇題

Which two statements are true about RSVP and the InServ QoS model？（）

A.a drawback of implementing RSVP is the requirement to migrate to a supporting routing protocol
B.RSVP uses DSCP to signal QoS requirements to routers
C.RSVP is a routing protocol
D.RSVP is an IP protocol that uses IP protocol ID 46， and TCP/UDP ports 3455
E.RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic
F.the flow-based approach of RSVP is ideal for large， scalable implementations such as the public internet

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Which three statements are true about the data traffic characteristics of voice traffic？ （）

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What are two QoS mechanisms that are used to prevent packet loss？（）

Which two statements are true about RSVP and the InServ QoS model？（）

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Which three statements are true about the data traffic characteristics of voice traffic？（）

What are two QoS mechanisms that are used to prevent packet loss？（）

Which two statements are true about RSVP and the InServ QoS model？（）