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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A company uses Azure Pipelines to deploy a web app to Azure App Service. They want to ensure that the deployment is first validated in a staging slot before swapping to production. What should they configure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use deployment slots in the App Service and configure auto-swap
Option C is correct because Azure App Service deployment slots allow you to deploy a web app to a staging slot, validate it, and then swap it to production with zero downtime. Auto-swap automates this process by swapping the staging slot into production after a successful deployment, ensuring validation occurs before the production slot receives the new code.
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.
✗
Create two separate pipelines for staging and production
Why it's wrong here
Separate pipelines increase complexity and don't provide automatic swap.
✗
Use Azure Traffic Manager to route traffic
Why it's wrong here
Traffic Manager routes traffic but doesn't manage deployment slots.
✓
Use deployment slots in the App Service and configure auto-swap
Why this is correct
Deployment slots with auto-swap allow validation in staging and then swap to production.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an App Service plan with multiple instances
Why it's wrong here
Multiple instances provide scaling, not staging.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse deployment slots with separate pipelines or scaling, not realizing that slots provide a built-in, zero-downtime validation mechanism within the same App Service.
Detailed technical explanation
How to think about this question
Under the hood, deployment slots are live app instances with their own hostnames and settings; swapping involves switching the routing rules so that the staging slot becomes the production slot. Auto-swap leverages the ARM API to perform the swap after a deployment succeeds, and it can be configured with slot-specific app settings that are sticky (slot-specific) to avoid configuration mismatches. A real-world scenario is using auto-swap with a warm-up request to ensure the staging slot is fully initialized before the swap completes, preventing cold-start issues in production.
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: Use deployment slots in the App Service and configure auto-swap — Option C is correct because Azure App Service deployment slots allow you to deploy a web app to a staging slot, validate it, and then swap it to production with zero downtime. Auto-swap automates this process by swapping the staging slot into production after a successful deployment, ensuring validation occurs before the production slot receives the new code.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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