Google ACE Deploying and implementing a cloud solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. 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 recently deployed a web application on a managed instance group (MIG) behind a regional external HTTP(S) load balancer. The application is a Python Flask app running on Compute Engine VMs. After a code update that caused increased response times under load, users report intermittent 503 errors. You examine the load balancer logs and see that the backend instances are periodically marked as unhealthy. The health check is configured to query the /health endpoint every 5 seconds with a healthy threshold of 2 and a timeout of 1 second. The application's /health endpoint returns 200 OK, but sometimes takes up to 1.5 seconds to respond. What is the most likely cause of the health check failures?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The health check response timeout is too low for the application's increased response time.
The health check is configured with a timeout of 1 second, but the /health endpoint now takes up to 1.5 seconds to respond due to the code update. Since the health check waits only 1 second for a response, any request that takes longer than that will be considered a failure, causing the backend to be marked unhealthy and triggering 503 errors. This is a classic mismatch between health check timeout and application response time.
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.
✗
The instances are overloaded and failing health checks intermittently.
Why it's wrong here
Overload would cause all requests to fail, not just health checks with short timeout.
✓
The health check response timeout is too low for the application's increased response time.
Why this is correct
Timeout of 1 second causes false negatives when response takes 1.5 seconds.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The health check firewall rule is missing or misconfigured.
Why it's wrong here
Firewall rules are typically static; the issue correlates with the code update.
✗
The health check is checking the wrong port.
Why it's wrong here
The /health endpoint returns 200, so the port is correct.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between a health check timing out versus the instance being truly unhealthy—candidates may incorrectly attribute intermittent 503s to overload (Option A) rather than recognizing that the health check timeout value is the direct cause when the endpoint response time exceeds it.
Detailed technical explanation
How to think about this question
Google Cloud health checks use a configurable timeout (default 5 seconds) and healthy/unhealthy thresholds. When the timeout is set too low relative to the application's actual response time, the health check probe will be marked as 'timeout' even if the application is functioning correctly. This can lead to a flapping state where instances are repeatedly taken out of the load balancer pool, causing intermittent 503 errors. In production, always set the health check timeout to be slightly higher than the 99th percentile response time of the health endpoint to avoid false negatives.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Deploying and implementing a cloud solution — This question tests Deploying and implementing a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The health check response timeout is too low for the application's increased response time. — The health check is configured with a timeout of 1 second, but the /health endpoint now takes up to 1.5 seconds to respond due to the code update. Since the health check waits only 1 second for a response, any request that takes longer than that will be considered a failure, causing the backend to be marked unhealthy and triggering 503 errors. This is a classic mismatch between health check timeout and application response time.
What should I do if I get this ACE 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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