Azure Container Registry is the correct choice because it provides a fully managed, private registry for storing and managing Docker container images and Open Container Initiative (OCI) artifacts, supporting the Docker Registry HTTP API V2 for seamless push and pull operations across Azure services. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of core compute and container services, often appearing alongside Azure Container Instances or Azure Kubernetes Service to see if you know which service handles image storage versus orchestration. A common trap is confusing Azure Container Registry with Azure Container Instances—remember that ACR is the storage and management layer for images, while ACI runs them. For a quick memory tip, think of ACR as the “library” for your container images, where you check in and check out artifacts, just like a registry keeps records.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which Azure service provides a managed registry for Docker container images and OCI artifacts?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Container Registry
Azure Container Registry (ACR) is the correct answer because it is a managed, private Docker registry service that stores and manages container images and Open Container Initiative (OCI) artifacts. It supports Docker Registry HTTP API V2, enabling push/pull operations for containerized workloads across Azure services.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Azure Kubernetes Service
Why it's wrong here
AKS runs containers; Container Registry stores the container images that AKS pulls from.
✗
Azure Container Instances
Why it's wrong here
ACI runs containers; Container Registry is the image storage and management service.
✓
Azure Container Registry
Why this is correct
ACR is a managed private Docker registry for storing and managing container images and OCI artifacts.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Artifact Repository
Why it's wrong here
Azure Artifacts (in DevOps) stores build artifacts; Container Registry is specifically for container images.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing a container registry (storage service) with a container orchestrator (AKS) or a container runtime (ACI), leading candidates to pick a compute service instead of the storage service.
Detailed technical explanation
How to think about this question
Azure Container Registry stores images in a private registry using the OCI Distribution Specification, supporting both Linux and Windows containers. It integrates with AKS and ACI for seamless image pulls, and offers geo-replication for low-latency pushes across regions. ACR also supports content trust (Notary) for image signing and vulnerability scanning via Microsoft Defender for Cloud.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Container Registry — Azure Container Registry (ACR) is the correct answer because it is a managed, private Docker registry service that stores and manages container images and Open Container Initiative (OCI) artifacts. It supports Docker Registry HTTP API V2, enabling push/pull operations for containerized workloads across Azure services.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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