Video Traffic QoS Requirements

B.

The correct answer is A: Video is typically variable bit rate.

Video traffic has a different nature compared to voice traffic, which requires different QoS requirements. One of the primary characteristics of video traffic is that it is typically variable bit rate, meaning the amount of bandwidth required for the video stream changes continuously depending on the content being transmitted.

For example, a video conference call that displays a presenter's slides will require a lower bit rate compared to a video conference call that displays a high-resolution video. This means that QoS mechanisms must be able to dynamically adjust to the varying bit rate requirements of the video stream to ensure smooth and continuous delivery of the video stream.

Another important characteristic of video traffic is its sensitivity to packet loss, jitter, and delay. Even small amounts of packet loss or delay can cause video quality degradation or even complete loss of the video stream. Therefore, QoS mechanisms must prioritize video traffic to prevent packet loss, minimize jitter, and reduce delay.

In contrast to voice traffic, video traffic is less sensitive to latency, as long as the latency remains within reasonable bounds. Additionally, video traffic may have different QoS requirements depending on the application or service being used. For example, a video conferencing application may require a higher level of QoS compared to a video streaming application.

In summary, the variable bit rate nature of video traffic is an important characteristic that governs QoS requirements for video, and QoS mechanisms must be able to dynamically adjust to the varying bit rate requirements to ensure smooth and continuous delivery of the video stream.