Explicit Congestion Notification
Explicit Congestion Notification (ECN) is a network protocol extension that allows routers to signal impending network congestion to endpoints before packet loss occurs. It works by marking packets with a congestion indicator in the IP header, enabling TCP and other transport protocols to reduce transmission rates proactively. This improves network efficiency and reduces latency compared to traditional loss-based congestion control.
Developers should learn ECN when working on high-performance networking applications, such as video streaming, VoIP, or cloud services, where minimizing latency and packet loss is critical. It is particularly useful in data centers and modern internet infrastructure to enhance Quality of Service (QoS) and support real-time communication protocols. Implementing ECN can lead to smoother data flows and better resource utilization in congested networks.