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.
A startup runs a web application on App Engine standard environment. They want to ensure the application can handle sudden traffic spikes without manual intervention. Which App Engine feature should they configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Automatic scaling with a maximum number of idle instances.
Option E is correct because App Engine's automatic scaling with a maximum number of idle instances is designed to handle sudden traffic spikes by dynamically creating and removing instances based on request load. This configuration allows the application to scale up quickly when traffic increases, ensuring responsiveness without manual intervention, while the maximum idle instances setting prevents over-provisioning and controls costs.
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.
✗
Manual scaling with a fixed number of instances.
Why it's wrong here
Manual scaling does not automatically handle spikes.
✗
Basic scaling with automatic instance creation.
Why it's wrong here
Basic scaling is for request-based but not ideal for web apps.
✗
Resident instances with a minimum number of always-on instances.
Why it's wrong here
Resident instances are always on but do not scale automatically.
✗
Custom scaling based on CPU utilization.
Why it's wrong here
Custom scaling is not a built-in App Engine feature.
✓
Automatic scaling with a maximum number of idle instances.
Why this is correct
Automatic scaling dynamically creates instances to handle traffic spikes.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'basic scaling' with 'automatic scaling' because both involve dynamic instance creation, but basic scaling does not maintain idle instances and is unsuitable for handling sudden traffic spikes without latency.
Detailed technical explanation
How to think about this question
Under the hood, App Engine automatic scaling uses a scheduler that monitors request latency, queue depth, and CPU utilization to decide when to add or remove instances. The 'maximum idle instances' parameter limits the number of spare instances kept ready to absorb traffic bursts, preventing excessive resource consumption while ensuring rapid response to spikes. In a real-world scenario, a startup with unpredictable traffic (e.g., a flash sale) would benefit from this setting to avoid both cold starts and runaway costs.
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: Automatic scaling with a maximum number of idle instances. — Option E is correct because App Engine's automatic scaling with a maximum number of idle instances is designed to handle sudden traffic spikes by dynamically creating and removing instances based on request load. This configuration allows the application to scale up quickly when traffic increases, ensuring responsiveness without manual intervention, while the maximum idle instances setting prevents over-provisioning and controls costs.
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.
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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