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Question 413 of 500

Deploying and implementing a cloud solution →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is to set `min-instances: 1` to keep a warm instance running and eliminate the cold start latency. This delay occurs because Cloud Run must spin up a new container from scratch when `min-instances: 0` is configured, and the 3–5 second lag you observed is the container initialization time—subsequent requests are fast because the instance stays warm. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of how Cloud Run’s scaling behavior directly impacts latency, and the common trap is to suggest increasing CPU or memory, which doesn’t fix cold starts if the bottleneck is container startup time. The most cost-effective fix is a single always-warm instance, adding only a small cost. Remember the mnemonic: “One warm instance beats a cold start every time.”

Google ACE Deploying and implementing a cloud solution Practice Question

This ACE practice question tests your understanding of deploying and implementing a cloud solution. 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?

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.

Question 1mediummultiple choice

Full question →

A
The Cloud Run service's container image is too large; reduce image size.
Why wrong: Image size can contribute to cold start time but is not the primary identified cause here. The question describes a classic cold start symptom.
B
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.
C
Switch from Cloud Run to GKE, which doesn't have cold starts.
Why wrong: 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.
D
Increase Cloud Run's request timeout to 30 seconds to accommodate cold starts.
Why wrong: Increasing timeout doesn't fix the cold start — it just tolerates it. The user experience is still degraded on the first request.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

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.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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 Cloud Run service's container image is too large; reduce image size.
Why it's wrong here
Image size can contribute to cold start time but is not the primary identified cause here. The question describes a classic cold start symptom.
✓
Set `min-instances: 1` to keep a warm instance running and eliminate the cold start latency.
Why this is correct
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.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Switch from Cloud Run to GKE, which doesn't have cold starts.
Why it's wrong here
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.
✗
Increase Cloud Run's request timeout to 30 seconds to accommodate cold starts.
Why it's wrong here
Increasing timeout doesn't fix the cold start — it just tolerates it. The user experience is still degraded on the first request.

Common exam traps

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.

Trap categories for this question

Similar concept trap
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.

Detailed technical explanation

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.

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.

What to study next

Got this wrong? Here's your next step.

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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FAQ

Questions learners often ask

What does this ACE question test?

Deploying and implementing a cloud solution — This question tests Deploying and implementing a cloud solution — 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?

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?

Static NAT maps one inside address to one outside address.

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