Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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.
Exhibit
gcloud container clusters describe my-cluster --zone us-central1-a
...
nodePools:
- name: default-pool
config:
machineType: n1-standard-4
diskSizeGb: 100
imageType: COS_CONTAINERD
oauthScopes:
- https://www.googleapis.com/auth/devstorage.read_only
initialNodeCount: 3
autoscaling:
enabled: true
minNodeCount: 1
maxNodeCount: 10
Horizontal Pod Autoscaler:
Name: my-hpa
Min replicas: 3
Max replicas: 20
CPU target: 80%
Current state: The deployment has 5 pods. CPU usage is at 90%. The HPA has not scaled up.
Refer to the exhibit. The HPA is configured to scale based on CPU, but it has not scaled up despite the CPU usage being above the target. Which 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.
gcloud container clusters describe my-cluster --zone us-central1-a
...
nodePools:
- name: default-pool
config:
machineType: n1-standard-4
diskSizeGb: 100
imageType: COS_CONTAINERD
oauthScopes:
- https://www.googleapis.com/auth/devstorage.read_only
initialNodeCount: 3
autoscaling:
enabled: true
minNodeCount: 1
maxNodeCount: 10
Horizontal Pod Autoscaler:
Name: my-hpa
Min replicas: 3
Max replicas: 20
CPU target: 80%
Current state: The deployment has 5 pods. CPU usage is at 90%. The HPA has not scaled up.
A
The cluster has autoscaling enabled, which may conflict with HPA.
Why wrong: Cluster autoscaler and HPA work together; they do not conflict.
B
The node pool oauthScopes lack the monitoring scope required for HPA to read metrics.
Without the monitoring scope, the HPA cannot retrieve CPU metrics from the nodes.
C
The HPA target is 80%, but the current CPU is 90% which should trigger scaling; the HPA may be broken.
Why wrong: The HPA itself is not broken; the issue is likely permissions.
D
The HPA min replicas is 3, so it cannot scale down, but it should scale up.
Why wrong: Min replicas does not prevent scaling up.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The node pool oauthScopes lack the monitoring scope required for HPA to read metrics.
The node pool uses a service account with devstorage.read_only scope, which does not include the required permissions for the HPA to read metrics. The HPA needs the monitoring scope or a service account with monitoring roles to access CPU metrics.
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 cluster has autoscaling enabled, which may conflict with HPA.
Why it's wrong here
Cluster autoscaler and HPA work together; they do not conflict.
✓
The node pool oauthScopes lack the monitoring scope required for HPA to read metrics.
Why this is correct
Without the monitoring scope, the HPA cannot retrieve CPU metrics from the nodes.
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 HPA target is 80%, but the current CPU is 90% which should trigger scaling; the HPA may be broken.
Why it's wrong here
The HPA itself is not broken; the issue is likely permissions.
✗
The HPA min replicas is 3, so it cannot scale down, but it should scale up.
Why it's wrong here
Min replicas does not prevent scaling up.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 node pool oauthScopes lack the monitoring scope required for HPA to read metrics. — The node pool uses a service account with devstorage.read_only scope, which does not include the required permissions for the HPA to read metrics. The HPA needs the monitoring scope or a service account with monitoring roles to access CPU metrics.
What should I do if I get this PCA question wrong?
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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