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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2.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
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E.RSVP specifically provides a level of service for rate-sensitive and delay-sensitive traffic
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