Azure Container Registry (ACR) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ service_behavior

intermediate

How does Azure Container Registry handle image versioning?

Azure Container Registry (ACR) stores container images with tags. What happens when you push a new image with the same tag as an existing image?

A The push operation fails with an error about duplicate tags.

B The registry keeps both images and automatically creates a new unique tag for the new image.

C The registry archives the old image and disables the tag until manually restored.

D The new image overwrites the existing image with that tag in the registry.

💡 Hint

Think about how tags work in container registries as pointers to images.

In ACR, tags are pointers to images. Pushing an image with an existing tag replaces the pointer to the new image, effectively overwriting the old image under that tag.

❓ Architecture

intermediate

Which Azure service is best to securely build container images integrated with Azure Container Registry?

You want to automate building container images and push them to Azure Container Registry securely without managing build servers. Which Azure service should you use?

A Azure Container Registry Tasks

B Azure DevOps Pipelines

C Azure Container Instances

D Azure Kubernetes Service

💡 Hint

Look for a service that integrates directly with ACR for building images.

ACR Tasks is a service that automates building, testing, and patching container images inside Azure Container Registry without needing separate build infrastructure.

❓ security

advanced

What is the effect of enabling Azure Defender for Container Registries on your ACR?

After enabling Azure Defender for Container Registries on your Azure Container Registry, what security feature is added?

A Encryption of container images at rest using customer-managed keys only.

B Automatic vulnerability scanning of container images pushed to the registry.

C Blocking all anonymous pull requests to the registry.

D Automatic rollback of images detected with vulnerabilities.

💡 Hint

Think about what Azure Defender adds to container registries.

Azure Defender for Container Registries provides vulnerability scanning for images stored in ACR, helping detect security issues before deployment.

✅ Best Practice

advanced

Which is the recommended way to restrict access to an Azure Container Registry from specific Azure Virtual Networks?

You want to limit access to your Azure Container Registry so only resources inside certain Azure Virtual Networks can pull or push images. What is the best practice to achieve this?

A Use Azure Private Link to create private endpoints for the registry inside the allowed Virtual Networks.

B Use Azure Role-Based Access Control (RBAC) to restrict access to the registry.

C Configure network security groups (NSGs) on the ACR subnet to allow only specific IPs.

D Enable the firewall on the ACR and add the allowed Virtual Network subnets to the firewall rules.

💡 Hint

Consider how to securely connect PaaS services privately inside your network.

Azure Private Link allows you to create private endpoints for ACR inside your Virtual Networks, restricting access to only those networks securely without exposing the registry publicly.

🧠 Conceptual

expert

What happens if you delete an Azure Container Registry resource in Azure Portal?

You delete your Azure Container Registry resource from the Azure Portal. What is the immediate effect on the container images stored inside?

A The registry is disabled but images remain stored and accessible until manually purged.

B The registry is soft-deleted and images remain accessible for 30 days before permanent deletion.

C All container images and metadata stored in the registry are permanently deleted immediately.

D The registry is archived and images become read-only until restored.

💡 Hint

Think about resource deletion behavior in Azure for PaaS services like ACR.

Deleting an Azure Container Registry resource permanently deletes all stored images and metadata immediately. There is no soft-delete or archive feature for ACR.