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AZ-204 Practice Question: App Service slot swap errors caused by missing…
This AZ-204 practice question tests your understanding of app service slot swap errors caused by missing…. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: deployment slots. 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.
After deploying a new version to the staging slot and swapping to production, users report a 60-second spike in 503 errors. The application takes 45 seconds to initialize its connection pools and caches before it can serve traffic. What is the root cause, and what should the developer configure to prevent this?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Roll back the slot swap and investigate the new version for bugs that only appear in production
The description is consistent with an initialization timing issue, not a code bug. Rolling back does not address the root cause. A rollback would also cause another 503 spike during the reverse swap if the root cause is not fixed.
B
Distractor review
Increase the App Service health check grace period so the load balancer waits longer after the swap
The health check grace period governs when App Service considers an instance unhealthy in a scale-out scenario. It does not control the slot swap traffic cutover. Application Initialization is the correct control for swap readiness.
C
Distractor review
Disable Always On for the staging slot so the slot starts fresh on every swap
Disabling Always On means the staging slot is shut down when idle and must cold-start on swap initiation, which would make the initialization delay worse. Always On should remain enabled on both slots to avoid cold starts.
D
Best answer
Configure Application Initialization in the App Service settings so the swap waits for the warm-up path to return 200 before redirecting production traffic
Application Initialization instructs the App Service platform to send a warm-up request to a configured URL path after the slot starts and before the swap completes. The platform holds traffic on the old slot until the warm-up succeeds. This makes swaps zero-downtime even for applications with long initialization times.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- deployment slots
- slot swap warm-up
- Application Initialization
- zero-downtime deployment
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
deployment slots
Related practice questions
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Question 6
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FAQ
Questions learners often ask
What does this AZ-204 question test?
deployment slots
What is the correct answer to this question?
The correct answer is: Configure Application Initialization in the App Service settings so the swap waits for the warm-up path to return 200 before redirecting production traffic — App Service performs slot swaps by routing traffic to the new slot only after the swap completes. If the new slot's application has not finished initializing, incoming requests fail during the initialization window. Application Initialization (web.config <applicationInitialization> or the portal Startup settings) causes App Service to send warm-up requests to a specified path and wait for a 200 response before completing the swap and routing external traffic. This ensures the slot is fully warmed before production traffic is directed to it.
What should I do if I get this AZ-204 question wrong?
Review deployment slots, then practise related AZ-204 questions on the same topic to reinforce the concept.
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