(The NetManager network management system is a network management software researched and developed by the Server Network Division of Lenovo Computer Corporation. It is a set of Chinese software with moderate functions, strong practicability, convenience and ease of use according to the Windows platform. This system is based on TCP/IP network, using SNMP, ICMP and other protocols to complete network management. Regardless of whether it is a single local area network or a larger TCP/IP Internet, this software has a strong ability to discover network topology, and a better ability to identify network interconnection methods. The network topology map automatically produced by the software accurately depicts the current network composition. The network topology diagram has a hierarchical structure, and the design ideas of the Internet layer, network layer and interface layer provide a solid foundation for network management, and provide administrators with a global and three-dimensional management perspective. The network topology map can be rewritten manually to reduce the network load, or it can be rewritten dynamically to facilitate real-time monitoring of the entire network. And allow users to modify and customize the topology map to meet the needs of users to the greatest extent.)