210-065 · Question #420
Video conference users in a remote location are complaining of pixelated images and poor video quality. What is a likery cause of this issue?
The correct answer is B. Network issues are causing excessive packet loss. Pixelated video and poor quality in a video conference typically indicates network-layer problems affecting media streams. Packet loss forces the codec to reconstruct missing data, resulting in visible artifacts.
Question
Video conference users in a remote location are complaining of pixelated images and poor video quality. What is a likery cause of this issue?
Options
- AThe WAN link is down.
- BNetwork issues are causing excessive packet loss
- CFeedback is occurring between the endpoint speaker and microphone
- DStatic interference is coming from nearby Bluetooth devices
How the community answered
(43 responses)- A2% (1)
- B79% (34)
- C12% (5)
- D7% (3)
Why each option
Pixelated video and poor quality in a video conference typically indicates network-layer problems affecting media streams. Packet loss forces the codec to reconstruct missing data, resulting in visible artifacts.
A completely down WAN link would prevent the call from being established at all, not produce degraded-but-running video.
Video codecs rely on a continuous stream of UDP packets; when packet loss occurs, the decoder must interpolate or drop blocks of the frame, producing pixelation and quality degradation. Excessive packet loss as low as 1-2% is enough to visibly degrade video quality. This is the most common real-world cause of poor video quality on an otherwise functioning call.
Acoustic feedback between speaker and microphone is an audio issue and does not cause pixelation or visual artifacts.
Bluetooth interference may disrupt a local wireless audio device but does not cause network-layer packet loss or video pixelation.
Concept tested: Packet loss impact on video conference quality
Source: https://www.cisco.com/c/en/us/support/docs/voice/ip-telephony-voice-over-ip-voip/116119-technote-product-00.html
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