QoS — Quality of Service
Definition
A set of networking technologies for prioritizing certain types of traffic over others, ensuring critical applications get bandwidth and low latency.
Context & Usage
QoS is essential for VoIP (low latency required), video conferencing, and any real-time application competing with bulk data traffic. Implementation involves classifying packets (by port, IP, or DSCP markings), queuing them in priority queues at network devices, and policing/shaping bandwidth. Common QoS schemas: Cisco DSCP markings, IEEE 802.1p tags.
Examples
- VoIP traffic DSCP EF (Expedited Forwarding)
- Cisco AutoQoS for voice
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