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200-301 · Question #490
200-301 Question #490: Real Exam Question with Answer & Explanation
The correct answer is C: by differentiating voice and video traffic. Quality of Service (QoS) optimizes voice traffic by differentiating it from other traffic types, ensuring it receives prioritized treatment.
Submitted by fatima_kr· Mar 5, 2026IP Services
Question
How does QoS optimize voice traffic?
Options
- Areducing bandwidth usage
- Bby reducing packet loss
- Cby differentiating voice and video traffic
- Dby increasing jitter
Explanation
Quality of Service (QoS) optimizes voice traffic by differentiating it from other traffic types, ensuring it receives prioritized treatment.
Common mistakes.
- A. QoS manages how bandwidth is utilized by prioritizing traffic, but it does not inherently reduce bandwidth usage; compression technologies typically handle that.
- B. Reducing packet loss is a positive outcome of effective QoS for voice, but the mechanism to achieve this is primarily through differentiation and prioritization, not just 'reducing packet loss' as a direct action.
- D. Increasing jitter is detrimental to the quality of voice traffic; QoS is designed to minimize or reduce jitter to ensure clear and smooth communication.
Concept tested. QoS optimization for voice traffic
Reference. https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Voice_and_Video/SRND_4_0/VVIDQoS.html
Topics
#QoS#Voice traffic#Traffic optimization
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