- A
`--no-traffic`
--no-traffic deploys the new revision without diverting any production traffic to it. The revision is accessible via its unique revision URL for testing without affecting live users.
- B
`--traffic=0`
Why wrong: `--traffic` in gcloud run deploy sets the traffic percentage for the new revision. `--traffic=0` is not a valid flag value in this context — use `--no-traffic` for zero-traffic deployment.
- C
`--revision-suffix=canary` with no traffic configuration
Why wrong: --revision-suffix names the revision but doesn't control traffic routing. Without --no-traffic, Cloud Run promotes the new revision to serve 100% of traffic by default.
- D
`--min-instances=0 --max-instances=0`
Why wrong: Setting max-instances to 0 would prevent the revision from running at all — not useful for testing. Traffic routing and instance count are separate configuration concerns.
Quick Answer
The answer is the `--no-traffic` flag. This flag is correct because it deploys a new Cloud Run revision while explicitly directing 0% of incoming traffic to it, leaving the existing revision to continue serving 100% of production traffic. Technically, Cloud Run creates the revision and assigns it a direct URL for isolated testing, but the `--no-traffic` flag prevents the routing rule from updating, so the new revision remains untouched by live requests. On the Google Associate Cloud Engineer exam, this question tests your understanding of traffic management during deployments—a common trap is confusing `--no-traffic` with `--clear-tags` or omitting the flag entirely, which would shift traffic to the new revision. Remember the memory tip: “No traffic, no impact—test the direct link, then shift the link.” This flag is the explicit, exam-approved method for zero-traffic deployments.
Google ACE Deploying and implementing a cloud solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. 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.
You are deploying a Cloud Run service revision that should initially receive 0% of traffic (for testing via a direct URL), while the existing revision continues to serve 100% of production traffic. Which `gcloud run deploy` flag achieves this?
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
`--no-traffic`
The `--no-traffic` flag on `gcloud run deploy` deploys a new revision but directs 0% of traffic to it, leaving the existing revision serving 100% of production traffic. This allows you to test the new revision via its direct URL without impacting live users. It is the correct and explicit way to achieve a zero-traffic deployment in Cloud Run.
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.
- ✓
`--no-traffic`
Why this is correct
--no-traffic deploys the new revision without diverting any production traffic to it. The revision is accessible via its unique revision URL for testing without affecting live users.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
`--traffic=0`
Why it's wrong here
`--traffic` in gcloud run deploy sets the traffic percentage for the new revision. `--traffic=0` is not a valid flag value in this context — use `--no-traffic` for zero-traffic deployment.
- ✗
`--revision-suffix=canary` with no traffic configuration
Why it's wrong here
--revision-suffix names the revision but doesn't control traffic routing. Without --no-traffic, Cloud Run promotes the new revision to serve 100% of traffic by default.
- ✗
`--min-instances=0 --max-instances=0`
Why it's wrong here
Setting max-instances to 0 would prevent the revision from running at all — not useful for testing. Traffic routing and instance count are separate configuration concerns.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse traffic routing with instance scaling, assuming `--min-instances=0` or a bare `--traffic=0` would prevent traffic, when in fact Cloud Run requires explicit traffic management via `--no-traffic` or the `--traffic` flag with a revision identifier.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Run uses a `Service` resource with a `traffic` block that maps revision names to traffic percentages. The `--no-traffic` flag sets the new revision's traffic percentage to 0 and adds it to the list, while the existing `LATEST` revision retains 100%. This is distinct from scaling: even with `--min-instances=0`, a revision with traffic can scale to zero instances but will still receive requests when traffic arrives. A real-world scenario is deploying a canary revision for manual validation via its unique URL (e.g., `https://<revision-name>---<service>-<hash>.run.app`) before gradually shifting traffic.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: `--no-traffic` — The `--no-traffic` flag on `gcloud run deploy` deploys a new revision but directs 0% of traffic to it, leaving the existing revision serving 100% of production traffic. This allows you to test the new revision via its direct URL without impacting live users. It is the correct and explicit way to achieve a zero-traffic deployment in Cloud Run.
What should I do if I get this ACE 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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Last reviewed: Jun 11, 2026
This ACE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ACE exam.
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