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多項(xiàng)選擇題

What are three types of packet delays that occur in a network？（）

A.timing
B.queuing
C.differential
D.serialization
E.packetization
F.propagation

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多項(xiàng)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
多項(xiàng)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