Secure multilevel management of large-scale network

With the development of computer and the Internet, the network has grown of very large-scale, and is constantly expanding, which bring a higher demand for secure network management. In this situation, we design a secure management method based on multilevel agents to make efficient secure management to large-scale network. A multilevel structure for large-scale network was built. And we designed the NMS (Network Management Server) monitor-agent framework. Our method gives realtime response to security incidents and can be used to analyze and forecast threats in network. It can perfectly handle the dynamic topological changes in large-scale network. Besides, we introduce RSA public key cryptosystem in data transmission process. By encrypting source data before transmission, we achieve the goal of ensuring the confidentiality and integrity of data. By using network attack graph, our method performs well in analyzing and forecasting network threats in network.