PCDOE Managing service incidents Practice Question
This PCDOE practice question tests your understanding of managing service incidents. 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.
During an incident, a DevOps engineer needs to temporarily increase the capacity of a Google Kubernetes Engine (GKE) cluster to handle the traffic surge. Which approach minimizes manual intervention and follows Google best practices?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable cluster autoscaler and update the horizontal pod autoscaler to scale faster.
Option A is correct because enabling the cluster autoscaler automatically adjusts the number of nodes in the node pool based on resource demands, while updating the horizontal pod autoscaler (HPA) to scale faster (e.g., reducing the stabilization window or increasing the target CPU utilization threshold) allows pods to replicate more quickly. This combination minimizes manual intervention by automating both pod-level and node-level scaling, aligning with Google's best practices for handling traffic surges in GKE.
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.
✓
Enable cluster autoscaler and update the horizontal pod autoscaler to scale faster.
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Manually add a node pool with larger machines via the Google Cloud Console.
Why it's wrong here
Manual intervention is slow and not automated.
✗
Create a new node pool and migrate pods using kubectl drain.
Why it's wrong here
This is a manual workaround, not best practice.
✗
Scale the existing node pool by increasing the maximum node count in the cluster.
Why it's wrong here
Scaling the node pool without autoscaler requires manual resizing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse simply increasing the maximum node count (Option D) with enabling the cluster autoscaler, assuming that raising the cap alone triggers automatic scaling, when in fact the cluster autoscaler must be explicitly enabled to add nodes based on demand.
Detailed technical explanation
How to think about this question
The cluster autoscaler works by monitoring pending pods and scaling node pools up or down based on resource requests, not actual usage, which can lead to subtle behaviors like scale-up delays if pod resource requests are too high. The HPA, on the other hand, scales pods based on observed metrics (e.g., CPU or custom metrics) and can be tuned with parameters like `--horizontal-pod-autoscaler-sync-period` or `--horizontal-pod-autoscaler-downscale-stabilization` to react faster. In a real-world scenario, a flash sale might cause a sudden CPU spike; combining cluster autoscaler with a faster HPA ensures both pods and nodes scale within minutes, avoiding throttling.
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.
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.
Managing service incidents — This question tests Managing service incidents — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable cluster autoscaler and update the horizontal pod autoscaler to scale faster. — Option A is correct because enabling the cluster autoscaler automatically adjusts the number of nodes in the node pool based on resource demands, while updating the horizontal pod autoscaler (HPA) to scale faster (e.g., reducing the stabilization window or increasing the target CPU utilization threshold) allows pods to replicate more quickly. This combination minimizes manual intervention by automating both pod-level and node-level scaling, aligning with Google's best practices for handling traffic surges in GKE.
What should I do if I get this PCDOE 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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