300-070 · Question #74
Which three characteristics of a video stream require the implementation of QoS? (Choose three.)
The correct answer is A. variable packet rate D. high MTU E. high packet rate. Video streams require QoS primarily because of three challenging characteristics: (A) Variable packet rate - video compression (e.g., H.264) causes the bitrate to fluctuate based on scene complexity (high motion = more data), making consistent bandwidth reservation difficult…
Question
Which three characteristics of a video stream require the implementation of QoS? (Choose three.)
Options
- Avariable packet rate
- Bconstant bandwidth
- Csmall packets
- Dhigh MTU
- Ehigh packet rate
How the community answered
(31 responses)- A74% (23)
- B6% (2)
- C19% (6)
Explanation
Video streams require QoS primarily because of three challenging characteristics: (A) Variable packet rate - video compression (e.g., H.264) causes the bitrate to fluctuate based on scene complexity (high motion = more data), making consistent bandwidth reservation difficult; (D) High MTU - video frames are large, so video typically uses large packets that consume significant bandwidth and are more susceptible to delay and loss; (E) High packet rate - video streams send a large number of packets per second to maintain smooth playback, which can congest queues and compete with other traffic. Together, these traits cause jitter, delay, and packet loss that degrade video quality without QoS prioritization. Option B (constant bandwidth) is actually desirable and not a problem. Option C (small packets) is the opposite of what video uses and does not inherently demand QoS.
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