What is CoS/QoS?

CoS (Class of Service) and QoS (Quality of Service) are networking techniques used to manage network traffic and prioritize certain types of data over others. They ensure that critical applications and services receive the necessary bandwidth and resources to function effectively, even when the network is congested. CoS typically operates at Layer 2 (Data Link Layer) using mechanisms like 802.1p, while QoS operates at Layer 3 (Network Layer) and above, employing techniques such as DiffServ (Differentiated Services) and traffic shaping. These methods help improve network performance, reduce latency, and enhance the user experience for real-time applications like VoIP and video conferencing.