300-070 · Question #239
Which to characteristics of a video steam require the implementation of QoS? (Choose two)
The correct answer is B. variable packet rate E. high packet rate. Two characteristics that drive the need for QoS in video streams are variable packet rate and high packet rate. Variable packet rate means the codec produces bursts of packets (especially during scene changes or high motion), which can overwhelm default FIFO queues and cause…
Question
Which to characteristics of a video steam require the implementation of QoS? (Choose two)
Options
- Acodec used
- Bvariable packet rate
- Cconstant banded
- Dsmall packets
- Ehigh packet rate
How the community answered
(19 responses)- B89% (17)
- C5% (1)
- D5% (1)
Explanation
Two characteristics that drive the need for QoS in video streams are variable packet rate and high packet rate. Variable packet rate means the codec produces bursts of packets (especially during scene changes or high motion), which can overwhelm default FIFO queues and cause jitter or drops. High packet rate means video generates many more packets per second than voice or data, placing heavy load on network buffers and schedulers. QoS mechanisms (like DSCP marking, queuing policies, and policing) are needed to guarantee timely delivery. A constant bitrate or small packets would actually be easier to handle without QoS; codec choice alone does not mandate QoS.
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