AZ-400 Design and implement a DevOps infrastructure Practice Question
This AZ-400 practice question tests your understanding of design and implement a devops infrastructure. 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.
An organization uses an on-premises Jenkins server to build Docker images and push them to Azure Container Registry (ACR). The security team requires that all images be scanned for vulnerabilities before deployment. The DevOps team needs to automate this scanning after each push. What is the most efficient way to meet this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an ACR task that runs a vulnerability scanner triggered by image push events.
Option D is correct because ACR Tasks natively support automated vulnerability scanning via integration with Azure Security Center or third-party scanners like Trivy. By creating an ACR task that triggers on image push events, the organization can scan images immediately after they are pushed without additional infrastructure or manual intervention. This approach is event-driven, serverless, and aligns with the requirement to automate scanning after each push.
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.
✗
Use Azure Policy to enforce vulnerability scanning.
Why it's wrong here
Azure Policy can audit but not automatically scan on push.
✗
Configure a Jenkins job to scan images before pushing to ACR.
Why it's wrong here
This would add latency to the build pipeline and not cover images from other sources.
✗
Configure a webhook in ACR to notify Jenkins to scan the image.
Why it's wrong here
Webhook adds complexity and Jenkins might not be always available.
✓
Create an ACR task that runs a vulnerability scanner triggered by image push events.
Why this is correct
ACR tasks can be triggered by push events and run custom steps like scanning.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Azure Policy with an action that performs scanning, or assume ACR webhooks can directly trigger Jenkins jobs for scanning, when in fact ACR Tasks provide a simpler, event-driven, and fully managed solution for post-push scanning.
Detailed technical explanation
How to think about this question
ACR Tasks can be configured with a trigger on image push using the `--push` flag or via Azure CLI, and they can run custom scripts or containers (e.g., Trivy, Snyk) to scan images. The task runs in a managed, isolated environment within the ACR registry, ensuring that scanning happens immediately after the image is stored, without requiring external compute resources. This pattern is commonly used in CI/CD pipelines where security gates are enforced at the registry level, reducing the risk of deploying vulnerable images.
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-400 question in full detail.
Design and implement a DevOps infrastructure — This question tests Design and implement a DevOps infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an ACR task that runs a vulnerability scanner triggered by image push events. — Option D is correct because ACR Tasks natively support automated vulnerability scanning via integration with Azure Security Center or third-party scanners like Trivy. By creating an ACR task that triggers on image push events, the organization can scan images immediately after they are pushed without additional infrastructure or manual intervention. This approach is event-driven, serverless, and aligns with the requirement to automate scanning after each push.
What should I do if I get this AZ-400 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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