Quality of Service (QoS) refers to mechanisms that are used to change how a network device deals with different packets and frames. QoS can be applied at Layer 2 or Layer 3.

QoS is especially useful for prioritizing different types of network traffic. For example, we can configure a router so that voice traffic it routes is prioritized and served first, before data traffic.

QoS is useful for services such as voice and video as well as other services.

Some common QoS features and mechanism include:

QoS components

QoS concepts

Traffic shaping and policing

Layer 2 QoS




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