The correct choice is the FTP trigger 'When a file is added or modified' with a recurrence of 10 minutes, because this trigger includes a built-in trigger state mechanism that automatically tracks which files have already been processed. When the logic app runs on its schedule, the trigger compares the current file list against its stored state, delivering only new or modified files since the last successful execution. This approach eliminates the need for external state management like databases or blob storage to prevent duplicate file processing. On the AZ-204 exam, this scenario tests your understanding of how Azure Logic Apps handles idempotent triggers and stateful polling—a common trap is assuming you need custom deduplication logic or a separate tracking table. Remember the key insight: the trigger itself is stateful, so you don't reinvent the wheel. Memory tip: "Trigger state tracks the slate—new files only, no duplicate fate."
AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. 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.
You are developing an Azure Logic App that processes files from an FTP server. The workflow must run every 10 minutes and process only new files. You need to ensure that files are not processed more than once. What should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the FTP trigger 'When a file is added or modified' with a recurrence of 10 minutes.
Option C is correct because the 'When a file is added or modified' FTP trigger in Azure Logic Apps automatically tracks processed files using a built-in 'trigger state' mechanism. When combined with a recurrence schedule (e.g., every 10 minutes), it ensures that only new or modified files since the last run are processed, preventing duplicate processing without external state management.
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 the FTP trigger 'When a file is added' with a recurrence of 10 minutes.
Why it's wrong here
This may reprocess files if the trigger doesn't track state.
✗
Use the 'When a file is added' trigger and store processed file names in a SQL database.
Why it's wrong here
This works but introduces unnecessary complexity and overhead.
✓
Use the FTP trigger 'When a file is added or modified' with a recurrence of 10 minutes.
Why this is correct
This trigger supports deduplication by tracking file timestamps.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the Sliding Window trigger and set the window size to 10 minutes.
Why it's wrong here
Sliding Window is for time windows, not file-level tracking.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a simple 'When a file is added' trigger with a recurrence is sufficient, but they overlook that the 'or modified' variant is required to leverage the built-in deduplication state, while the plain 'added' trigger lacks this tracking and can cause reprocessing.
Detailed technical explanation
How to think about this question
Under the hood, the 'When a file is added or modified' FTP trigger uses a 'trigger state' that stores a timestamp or watermark of the last processed file. On each recurrence, the trigger queries the FTP server for files with a last-modified timestamp greater than the stored watermark, ensuring only new or changed files are fetched. This mechanism relies on the FTP server's support for the MDTM command (RFC 3659) to retrieve file modification timestamps, which is critical for correct operation.
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-204 question in full detail.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the FTP trigger 'When a file is added or modified' with a recurrence of 10 minutes. — Option C is correct because the 'When a file is added or modified' FTP trigger in Azure Logic Apps automatically tracks processed files using a built-in 'trigger state' mechanism. When combined with a recurrence schedule (e.g., every 10 minutes), it ensures that only new or modified files since the last run are processed, preventing duplicate processing without external state management.
What should I do if I get this AZ-204 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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