Final answer:
The default network rule for an Azure Storage Account is to allow access from all networks. To enhance security, you can restrict this access by configuring specific IP ranges or virtual networks through Azure's settings.
Step-by-step explanation:
When configuring network access to your Azure Storage Account, the default network rule set is to allow access from all networks. This means that, by default, any client from any network can access your storage account unless you modify these settings to restrict access. Azure provides the ability to secure your storage account by allowing you to specify which networks have permission to access it. This is typically done through the 'Firewalls and virtual networks' settings in the Azure portal.
To restrict access, you might consider configuring the network rule to allow only specific IP address ranges, or to allow access from selected virtual networks. It is important to carefully manage these settings to ensure that your Azure storage data remains secure while still being accessible to authorized users or applications.