QoS (Quality of Service)
QoS prioritizes certain traffic types (voice/video) to reduce latency and jitter.
Updated: 2026-03-05
Definition
QoS is a set of techniques to classify and prioritize traffic under congestion.
It’s commonly used to protect voice and video flows with low latency and jitter requirements.
Key points
- Classify → mark → queue → schedule
- Useful under congestion conditions
- Voice/video are typical QoS priorities
Common mistakes
- Applying QoS without identifying real bottlenecks.
- Assuming QoS increases bandwidth (it prioritizes, doesn’t create capacity).
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