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You develop an Azure Function app that processes orders. The function must write order status updates to a database. You need to ensure that if the function fails after writing to the database, the order is not lost and can be retried. Which pattern should you implement?

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You develop an Azure Function app that processes orders. The function must write order status updates to a database. You need to ensure that if the function fails after writing to the database, the order is not lost and can be retried. Which pattern should you implement?

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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

Best answer

Use a Durable Functions orchestration

Durable Functions allow you to define an orchestrator that coordinates activities, provides retry, and handles failures atomically.

B

Distractor review

Use a retry policy in the function code

A retry policy only retries the function invocation; it does not roll back or compensate database writes already performed.

C

Distractor review

Enable function-level exception handling

Exception handling can catch errors but cannot ensure the entire process is reliably retried or compensated.

D

Distractor review

Use an Azure Storage Queue for the function input

A queue input ensures the message is not lost, but if the function fails after writing to the database, the message may be requeued but the database side effect remains, leading to duplicate or inconsistent state.

Common exam trap

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.

Technical deep dive

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.

Related practice questions

Related AZ-204 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

An application stores customer invoices in Azure Blob Storage. Deleted blobs must be recoverable for 14 days. What should be enabled?

Question 2

You are deploying a containerized application to Azure Container Instances. The application requires a custom domain name and SSL/TLS termination. You need to configure these features. Which resource should you create alongside the container group?

Question 3

A developer needs to run a Kusto query against application request data to identify 95th percentile latency by operation. Where should the query be run? The architecture review board prefers a managed AWS-native control.

Question 4

You are developing a web app that authenticates users via Microsoft Entra ID. The app needs to read the user's profile and send emails on their behalf. You want to minimize user consent prompts. Which OAuth 2.0 grant type should you use?

Question 5

You are developing an Azure Function that processes messages from an Azure Service Bus queue. The function uses a Service Bus queue trigger and runs on a Consumption Plan. The queue receives a high volume of messages in bursts. You need to ensure that the function scales out to handle the load but does not exceed 10 concurrent instances. Which configuration should you apply?

Question 6

You are monitoring an Azure App Service using Application Insights. You notice that the server response time is high for certain requests. You need to drill down to see which external dependencies (like databases or APIs) are causing the delay. Which Application Insights feature should you use?

FAQ

Questions learners often ask

What does this AZ-204 question test?

Static NAT maps one inside address to one outside address.

What is the correct answer to this question?

The correct answer is: Use a Durable Functions orchestration — Durable Functions provide reliable execution with orchestration, compensating actions, and automatic retries. This ensures that if the function fails after a side-effect (database write), the orchestration can replay or compensate. A simple retry policy does not handle side effects, and exception handling alone cannot guarantee retry. Using a queue input does not manage side effects after failure.

What should I do if I get this AZ-204 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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