Microsoft Azure Solutions Architect Expert AZ-305 Practice Question
You are designing a configuration strategy for a set of .NET micro-services running in both Azure Kubernetes Service (AKS) and Azure App Service. The services currently store JSON configuration files inside their container images, so any change requires a new build and redeployment. Business stakeholders now want to:
Centralize all non-secret settings for the services.
Enable feature flags that can be toggled without redeploying code.
Support environment-specific overrides (Dev, Test, Prod).
Keep secrets such as connection strings in Azure Key Vault, but reference them from the same configuration store.
Minimize code changes in the applications. Which Azure service should you recommend to meet these requirements?
Azure App Configuration with Key Vault-backed references for secrets
Kubernetes ConfigMaps for application settings together with Azure Policy for feature toggling
Azure Automation State Configuration (DSC) to push configuration files to each node
Azure Key Vault as the sole store for both settings and secrets
Azure App Configuration is a fully managed service that provides a central repository for application settings and feature flags. It supports environment-specific key namespaces, label-based versioning, and a .NET configuration provider that enables hot-reload of values across running instances with minimal code changes. App Configuration can store non-secret data directly and reference secrets that reside in Azure Key Vault, ensuring sensitive values remain protected. Azure Key Vault alone does not offer feature-flag management or structured configuration hierarchies; Azure Automation State Configuration and Azure Policy address infrastructure compliance, not application runtime settings; and AKS ConfigMaps lack built-in feature-flag capabilities, dynamic refresh libraries, and secure secret referencing across mixed compute targets. Therefore, Azure App Configuration best satisfies all stated requirements.
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Microsoft Azure Solutions Architect Expert AZ-305
Design infrastructure solutions
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