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ACE Practice Question: You have a Cloud Run service configured with…
This ACE practice question tests your understanding of you have a cloud run service configured with…. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You have a Cloud Run service configured with `min-instances: 0`. During load testing you notice the first request after a period of inactivity takes 3–5 seconds instead of the normal 100ms. Subsequent requests are fast. What is causing this, and what is the most cost-effective fix?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Switch from Cloud Run to GKE, which doesn't have cold starts.
GKE with HPA can have similar pod-startup delays when scaling from zero. More importantly, switching to GKE is a major architectural change and not cost-effective for this use case.
B
Distractor review
Increase Cloud Run's request timeout to 30 seconds to accommodate cold starts.
Increasing timeout doesn't fix the cold start — it just tolerates it. The user experience is still degraded on the first request.
C
Distractor review
The Cloud Run service's container image is too large; reduce image size.
Image size can contribute to cold start time but is not the primary identified cause here. The question describes a classic cold start symptom.
D
Best answer
Set `min-instances: 1` to keep a warm instance running and eliminate the cold start latency.
min-instances: 1 prevents scale-to-zero, keeping a container warm. The first request after inactivity hits a ready instance instead of waiting for container startup.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Related practice questions
Related ACE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
What is the correct order of the Google Cloud resource hierarchy from highest to lowest level?
Question 2
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Question 3
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Question 4
A team wants to receive an email alert when the average CPU utilization of VMs in a managed instance group exceeds 80% for more than 5 minutes. What should they create in Cloud Monitoring?
Question 5
A junior developer needs read-only access to all GCP resources in a project. Which IAM role grants the minimum permissions required?
Question 6
A startup creates its first Google Cloud project. Before deploying any paid resources, what must be linked to the project?
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FAQ
Questions learners often ask
What does this ACE question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Set `min-instances: 1` to keep a warm instance running and eliminate the cold start latency. — Cold starts occur when Cloud Run needs to spin up a new container instance from zero. The 3–5 second delay is the container startup time. Setting `min-instances: 1` keeps at least one instance warm at all times, eliminating cold starts for the first request. This adds a small cost (one always-running instance) but is the most targeted fix. Increasing memory or CPU doesn't directly address cold start if the issue is container initialization time.
What should I do if I get this ACE question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ACE NAT questions on configuration and troubleshooting.
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