Google PCA Practice Question: Analyze and optimize technical and business processes
This PCA practice question tests your understanding of analyze and optimize technical and business processes. 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.
Network Topology
Refer to the exhibit. A Cloud Run service is experiencing high latency and returns 502 errors when traffic spikes. What should the team adjust first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Decrease containerConcurrency to 10
The 502 errors and high latency during traffic spikes indicate that the Cloud Run service is overwhelmed by concurrent requests. Decreasing `containerConcurrency` to 10 limits the number of simultaneous requests each container instance can handle, which reduces the likelihood of request timeouts and 502 errors by forcing Cloud Run to scale out more instances sooner. This directly addresses the root cause—excessive concurrency per container—without incurring additional cost or requiring code changes.
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.
✓
Decrease containerConcurrency to 10
Why this is correct
Lowering concurrency reduces the number of simultaneous requests per container, preventing overload and 502s.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the maximum number of instances
Why it's wrong here
More instances spread load but do not fix per-container concurrency issues.
✗
Increase the CPU limit to 2000m
Why it's wrong here
CPU may not be the bottleneck; concurrency is more likely.
✗
Increase the memory limit to 512Mi
Why it's wrong here
Memory may not be the bottleneck; concurrency is more likely.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that scaling out (increasing max instances) or scaling up (increasing CPU/memory) is the immediate fix for latency and errors, when the real issue is often the concurrency limit per container.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Run uses the `containerConcurrency` setting to control how many requests are routed to a single container instance at any time; the default is 80, which can cause request queuing and timeouts under spikes. When concurrency is lowered, Cloud Run’s autoscaler reacts faster by creating new instances earlier, as it tracks the number of in-flight requests per instance. In real-world scenarios, this adjustment is often the first step before tuning CPU/memory, because it directly reduces the risk of request starvation and HTTP 502 responses from upstream timeouts.
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.
Analyze and optimize technical and business processes — This question tests Analyze and optimize technical and business processes — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Decrease containerConcurrency to 10 — The 502 errors and high latency during traffic spikes indicate that the Cloud Run service is overwhelmed by concurrent requests. Decreasing `containerConcurrency` to 10 limits the number of simultaneous requests each container instance can handle, which reduces the likelihood of request timeouts and 502 errors by forcing Cloud Run to scale out more instances sooner. This directly addresses the root cause—excessive concurrency per container—without incurring additional cost or requiring code changes.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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