This diagram illustrates a typical network connection between a user terminal and a bank account server. The user accesses the network through a laptop, which is connected to the bank account server via a switch in the network. The bank account server is responsible for processing user requests, such as balance inquiries and transfers. In addition, the bank account server also communicates with other internal systems (such as risk management systems, transaction systems, etc.) to complete various business operations. The entire network also includes firewall devices to ensure network security.