Data Flow Diagram for Internal/External Network Domain Interaction

This diagram illustrates the interaction architecture between internal and external network data domains, clearly demarcating the security-isolated "external network data domain" and "internal network data domain" with a vertical dashed line. In the external domain on the left, upon receiving requests from external users, data is synchronized unidirectionally from the "external network database" to the internal network via the "boundary access" module. In the internal domain on the right, "business systems" initiate data requests and outputs with the "internal network database," while the latter interacts bidirectionally with the "platform big data center"; this center utilizes "data services" to integrate master data, standard data, and shared data for business operations. While ensuring secure isolation between the internal and external networks, the overall architecture enables controlled cross-network data flow and provides platform-level data service support.