Example Concept: QoS best practices involve classifying and prioritizing network traffic using techniques such as traffic shaping, policing, and marking. Traffic is categorized into different classes based on application requirements, and policies are applied to ensure that high-priority traffic, like voice and video, receives the necessary bandwidth and low latency. Tools like Cisco's QoS Policy Manager or Juniper's class-of-service (CoS) can be used to implement these policies effectively, ensuring that critical applications perform reliably even under network congestion.