- A
Create a single monorepo with all microservices. Use GitHub Actions with a multi-branch pipeline that builds only changed services. Deploy to AKS using kubectl commands in the pipeline. For rollback, redeploy the previous image tag.
Why wrong: Incorrect: Monorepo violates requirement 1 (separate repos).
- B
Use Azure Pipelines with a single build pipeline that triggers on any change in any repo using webhooks. Use Azure DevOps Release Pipelines to deploy to AKS using Helm. Store Helm charts in Azure Container Registry. For rollback, use Helm rollback command.
Why wrong: Incorrect: Azure Pipelines introduces a different CI tool, and using a single pipeline for all repos violates separation of concerns.
- C
Use GitHub Actions for CI and deploy directly to AKS using kubectl in the same workflow. Store Kubernetes manifests in each microservice repo. Use Argo CD to monitor the repos and sync.
Why wrong: Incorrect: Argo CD adds complexity and is not a native Azure/GitHub solution; also deploying directly from CI bypasses GitOps.
- D
Use GitHub Actions in each microservice repo for CI to build and push images to ACR. Use a separate GitOps repository that contains Kubernetes manifests. Configure Flux v2 in AKS to sync from the GitOps repo. When a new image is pushed to ACR, update the manifest in the GitOps repo via a GitHub Action, triggering Flux to deploy. For rollback, revert the commit in the GitOps repo.
Correct: This satisfies all requirements with GitHub Actions for CI, Flux for GitOps, and rollback via Git revert.
AZ-400 Practice Question: Design and implement build and release pipelines
This AZ-400 practice question tests your understanding of design and implement build and release pipelines. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You are a DevOps engineer at a large enterprise that develops a cloud-native application using microservices architecture. The application consists of 15 microservices, each stored in a separate GitHub repository. Your team uses GitHub Actions for CI/CD and Azure Kubernetes Service (AKS) for production. The current deployment process is manual and error-prone. You need to design an automated CI/CD pipeline that supports the following requirements:
1. Each microservice must have its own build and test pipeline triggered on pull requests and merges to the main branch. 2. Upon merging to main, a container image must be built, tagged with the Git commit SHA, and pushed to Azure Container Registry (ACR). 3. A separate release pipeline must deploy the updated images to AKS using a GitOps approach with Flux v2. 4. The release pipeline must support rolling back to a previous version quickly if a deployment fails. 5. The entire solution must be defined as code to ensure reproducibility.
Which approach should you recommend?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use GitHub Actions in each microservice repo for CI to build and push images to ACR. Use a separate GitOps repository that contains Kubernetes manifests. Configure Flux v2 in AKS to sync from the GitOps repo. When a new image is pushed to ACR, update the manifest in the GitOps repo via a GitHub Action, triggering Flux to deploy. For rollback, revert the commit in the GitOps repo.
Option A is correct because it uses GitHub Actions for CI per microservice, pushes to ACR, and uses Flux v2 for GitOps-based deployment with rollback by reverting Git. Option B is wrong because Azure Pipelines is not preferred if the team already uses GitHub Actions and GitOps. Option C is wrong because multi-branch pipelines in a single repo would mix concerns and violate requirement 1 (separate repos). Option D is wrong because Argo CD is not a native GitHub or Azure solution and introduces complexity.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a single monorepo with all microservices. Use GitHub Actions with a multi-branch pipeline that builds only changed services. Deploy to AKS using kubectl commands in the pipeline. For rollback, redeploy the previous image tag.
Why it's wrong here
Incorrect: Monorepo violates requirement 1 (separate repos).
- ✗
Use Azure Pipelines with a single build pipeline that triggers on any change in any repo using webhooks. Use Azure DevOps Release Pipelines to deploy to AKS using Helm. Store Helm charts in Azure Container Registry. For rollback, use Helm rollback command.
Why it's wrong here
Incorrect: Azure Pipelines introduces a different CI tool, and using a single pipeline for all repos violates separation of concerns.
- ✗
Use GitHub Actions for CI and deploy directly to AKS using kubectl in the same workflow. Store Kubernetes manifests in each microservice repo. Use Argo CD to monitor the repos and sync.
Why it's wrong here
Incorrect: Argo CD adds complexity and is not a native Azure/GitHub solution; also deploying directly from CI bypasses GitOps.
- ✓
Use GitHub Actions in each microservice repo for CI to build and push images to ACR. Use a separate GitOps repository that contains Kubernetes manifests. Configure Flux v2 in AKS to sync from the GitOps repo. When a new image is pushed to ACR, update the manifest in the GitOps repo via a GitHub Action, triggering Flux to deploy. For rollback, revert the commit in the GitOps repo.
Why this is correct
Correct: This satisfies all requirements with GitHub Actions for CI, Flux for GitOps, and rollback via Git revert.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-400 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this AZ-400 question test?
Design and implement build and release pipelines — This question tests Design and implement build and release pipelines — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use GitHub Actions in each microservice repo for CI to build and push images to ACR. Use a separate GitOps repository that contains Kubernetes manifests. Configure Flux v2 in AKS to sync from the GitOps repo. When a new image is pushed to ACR, update the manifest in the GitOps repo via a GitHub Action, triggering Flux to deploy. For rollback, revert the commit in the GitOps repo. — Option A is correct because it uses GitHub Actions for CI per microservice, pushes to ACR, and uses Flux v2 for GitOps-based deployment with rollback by reverting Git. Option B is wrong because Azure Pipelines is not preferred if the team already uses GitHub Actions and GitOps. Option C is wrong because multi-branch pipelines in a single repo would mix concerns and violate requirement 1 (separate repos). Option D is wrong because Argo CD is not a native GitHub or Azure solution and introduces complexity.
What should I do if I get this AZ-400 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-400 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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