PCD Building and testing applications Practice Question
This PCD practice question tests your understanding of building and testing applications. 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.
Network Topology
Refer to the exhibit. A developer runs the above command to deploy a Cloud Function triggered by Pub/Sub. The function fails to execute when a message is published. The logs show: "Function execution took 60001 ms, finished with status: 'timeout'". What should the developer do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the function code for long-running operations
The timeout error indicates the Cloud Function is exceeding its maximum execution duration. The default timeout for Cloud Functions is 60 seconds, and the logs confirm the function ran for 60001 ms before being forcibly terminated. The most likely cause is that the function code contains long-running operations (e.g., synchronous HTTP calls, database queries, or heavy computation) that do not complete within the allotted time. Therefore, the developer should inspect and optimize the function code to reduce execution time, such as by using asynchronous processing or breaking the work into smaller chunks.
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.
✗
Change the trigger to HTTP
Why it's wrong here
Changing the trigger type changes the event source but doesn't fix the timeout issue.
✗
Reduce the number of function instances
Why it's wrong here
Instance count affects concurrency, not execution time per request.
✓
Check the function code for long-running operations
Why this is correct
The timeout indicates the function is taking too long; the proper fix is to optimize the code to complete within the allowed time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the function timeout to 9 minutes
Why it's wrong here
Increasing timeout is a temporary fix; the root cause is the slow code that should be optimized.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that increasing the timeout is the correct fix for any timeout error, but the trap here is that the default timeout is 60 seconds and the logs show exactly 60001 ms, indicating the function is hitting the default limit — the correct first step is to optimize the code, not blindly extend the timeout.
Detailed technical explanation
How to think about this question
Cloud Functions have a configurable timeout ranging from 1 to 540 seconds (9 minutes), with a default of 60 seconds. When a function times out, the runtime terminates the execution and logs the 'finished with status: timeout' message. In Pub/Sub-triggered functions, the message is not acknowledged until the function completes successfully; if the function times out, the message is not acknowledged and may be retried, potentially causing duplicate processing. A common real-world scenario is a function that makes synchronous external API calls without setting a shorter client timeout, causing the function to hang until the Cloud Function timeout is reached.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Building and testing applications — This question tests Building and testing applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the function code for long-running operations — The timeout error indicates the Cloud Function is exceeding its maximum execution duration. The default timeout for Cloud Functions is 60 seconds, and the logs confirm the function ran for 60001 ms before being forcibly terminated. The most likely cause is that the function code contains long-running operations (e.g., synchronous HTTP calls, database queries, or heavy computation) that do not complete within the allotted time. Therefore, the developer should inspect and optimize the function code to reduce execution time, such as by using asynchronous processing or breaking the work into smaller chunks.
What should I do if I get this PCD 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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Question Discussion
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