Knowledge of the up-to-date network performance is critical for numerous important network management tasks, including proactive and reactive resource management and traffic engineering, as well as providing QoS guarantees for end-user applications.

• 这些及时的网络性能数据对于许多网管业务，如主动式和被动式的资源管理、流量工程以及端到端的服务质量保证，显得尤为重要。