Exam 350-801 topic 1 question 286 discussion

I think the answers are A and B, because: QoS mechanisms for Video- In principle the QoS mechanisms employed to deliver the SLAs for a video transport network are mostly the same as those for audio. There are some differences however, mostly due to the bursty nature of video and VBR (variable-bit-rate) transmission.

L2 bandwidth Unlike voice, real-time IP video traffic in general is a somewhat bursty, variable bit rate stream. https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-video/212134-Video-Quality-of-Service-QOS-Tutorial.html

When configuring region settings for audio in the Cisco Unified Communications Manager, the administrator simply needs to select the compression type and audio codec preference. Audio media is so predictable that the bandwidth used is based directly on the codec selection. However, video is very greedy and bursty when it comes to bandwidth consumption. Video codecs do not have a specific set bandwidth rate to them like audio codecs. A video call can be placed using 480p30 resolution at 384 kbps or at 2 Mbps. CCNP and CCIE Collaboration Core CLCOR 350-801 Official Cert Guide Chapter 15: Cisco Unified Communications Manager Setup

The correct answers are definitely A and B. "Provisioned bandwidth of the link" is a consequence, not a technical reason for implementing QoS.

Re-reading link from DaKenjee, I vote A and B. Even though C is correct, I think A and B are better answers. Usually Cisco is looking for a more generic answer, not specific to a particular lin with underprovisioned bandwidth. Just going by my gut, from experience of taking dozens of Cisco exams.

I would say A and C, because if we have a bursty behavior it means we have some congestion on our network so we need QoS. The answer B is a fact, it's not up to a network. The answer C is correct if we have a poor link we will have a traffic to priorize. So A and C

I go for A and B