Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Exhibit
Refer to the exhibit.
```
$ gcloud compute instances list --limit=5
NAME ZONE MACHINE_TYPE PREEMPTIBLE
instance-1 us-east1-b n1-standard-1 true
instance-2 us-east1-c n1-standard-1 false
instance-3 us-central1-a e2-medium false
instance-4 us-central1-b n1-standard-1 false
instance-5 us-west1-a n1-highcpu-4 false
```
A user reports that an application running on instance-1 is unreliable and often restarts. What is the most likely cause?
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 instance is preemptible and can be terminated at any time.
Preemptible instances (now called 'spot instances' in Google Cloud) can be terminated by Google Compute Engine at any time due to resource demands, with only 30 seconds of warning. This makes them unsuitable for applications that require reliability and continuous uptime, as the instance can be stopped abruptly, causing the application to restart or become unavailable.
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 instance is in a single zone without redundancy.
Why it's wrong here
Zone isolation does not cause frequent restarts.
✗
The machine type is too small.
Why it's wrong here
n1-standard-1 is not necessarily too small.
✗
The instance is using an outdated image.
Why it's wrong here
No evidence of outdated image.
✓
The instance is preemptible and can be terminated at any time.
Why this is correct
Preemptible VMs are subject to termination within 24 hours.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between preemptible instances and other common causes of instability, such as resource exhaustion or zone failures, to see if candidates understand that preemptible instances are explicitly designed to be terminated at any time.
Detailed technical explanation
How to think about this question
Preemptible instances have a maximum runtime of 24 hours and can be terminated earlier if Google needs the capacity. The termination is signaled via an ACPI G2 Soft-Off command, giving the instance 30 seconds to handle the shutdown gracefully. This behavior is fundamental to the preemptible pricing model, which offers significant cost savings (up to 60-91% off regular instances) in exchange for the risk of termination.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The instance is preemptible and can be terminated at any time. — Preemptible instances (now called 'spot instances' in Google Cloud) can be terminated by Google Compute Engine at any time due to resource demands, with only 30 seconds of warning. This makes them unsuitable for applications that require reliability and continuous uptime, as the instance can be stopped abruptly, causing the application to restart or become unavailable.
What should I do if I get this PCA 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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Question Discussion
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