350-801 · Question #346
Which two technical reasons make QoS a necessity in a video deployment? (Choose Two)
The correct answer is C. Variable bit rate of the video stream D. Bursly behavior of video traffic. Quality of Service (QoS) is crucial in video deployments because video traffic exhibits variable bit rates and bursty behavior. These characteristics can lead to congestion and quality degradation if not properly managed.
Question
Which two technical reasons make QoS a necessity in a video deployment? (Choose Two)
Options
- ALow response time between endpoints
- BProvisioned bandwidth of the link
- CVariable bit rate of the video stream
- DBursly behavior of video traffic
How the community answered
(33 responses)- A3% (1)
- B3% (1)
- C94% (31)
Why each option
Quality of Service (QoS) is crucial in video deployments because video traffic exhibits variable bit rates and bursty behavior. These characteristics can lead to congestion and quality degradation if not properly managed.
Low response time is a desired outcome of QoS, not a technical reason for its necessity in a video deployment.
The provisioned bandwidth defines capacity but does not manage the specific behavior of video traffic, which is why QoS is needed for dynamic traffic patterns.
Video streams often use variable bit rate (VBR) encoding, meaning the bandwidth consumed fluctuates significantly based on scene complexity, requiring QoS to manage these changes and prevent quality drops during peak usage.
Video traffic, especially interactive video, is inherently bursty, sending large amounts of data in short periods, which can quickly saturate links and cause congestion without proper QoS prioritization and shaping.
Concept tested: Reasons for QoS in video deployments
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Video/qos_videodp.html
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