300-070 Question #239: Real Exam Question with Answer & Explanation

The correct answer is B: variable packet rate. Two characteristics that drive the need for QoS in video streams are variable packet rate and high packet rate. Variable packet rate means the codec produces bursts of packets (especially during scene changes or high motion), which can overwhelm default FIFO queues and cause jitt

Question

Which to characteristics of a video steam require the implementation of QoS? (Choose two)

Options

Acodec used
Bvariable packet rate
Cconstant banded
Dsmall packets
Ehigh packet rate

Explanation

Two characteristics that drive the need for QoS in video streams are variable packet rate and high packet rate. Variable packet rate means the codec produces bursts of packets (especially during scene changes or high motion), which can overwhelm default FIFO queues and cause jitter or drops. High packet rate means video generates many more packets per second than voice or data, placing heavy load on network buffers and schedulers. QoS mechanisms (like DSCP marking, queuing policies, and policing) are needed to guarantee timely delivery. A constant bitrate or small packets would actually be easier to handle without QoS; codec choice alone does not mandate QoS.

Community Discussion

No community discussion yet for this question.

Full 300-070 Practice