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What would be the expected behavior for an NSP?
I'm using a network security perimeter in Azure. In the perimeter there are two resources assigned: A storage Account and An Azure SQL Databse. I'm using the BULK INSERT dbo.YourTable FROM 'sample_...
The expected behavior of a Network Security Perimeter (NSP) is that resources inside the same perimeter should be able to communicate with each other without additional public inbound/outbound rules. However, because Azure SQL Database support for NSP is still in preview, the seamless communication you observed with Key Vault (GA) is not yet fully implemented for SQL. What you are seeing, having to add explicit rules for SQL to reach Storage which is a limitation of the preview state, not the final intended design.
Network Security Perimeter for Azure Storage | Microsoft Learn
Network Security Perimeter - Azure SQL Database | Microsoft Learn