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ACE Practice Question: Ensure that a Cloud Run service can only be…
This ACE practice question tests your understanding of ensure that a cloud run service can only be…. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 need to ensure that a Cloud Run service can only be invoked by specific Cloud Scheduler jobs and not from the public internet, while still receiving HTTP requests. The Cloud Run service currently allows unauthenticated invocations. What configuration changes are required?
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
Add a Cloud Armor security policy to the Cloud Run service blocking all IPs except Cloud Scheduler.
Cloud Armor cannot be attached directly to Cloud Run services (only to load balancers). Also, Cloud Scheduler doesn't have fixed IP ranges to allowlist.
B
Best answer
Disable unauthenticated invocations on the Cloud Run service, grant `roles/run.invoker` to the Scheduler SA, and configure Scheduler to use OIDC authentication.
This three-step configuration enforces authentication: Cloud Run requires auth tokens, the Scheduler SA has invoker permission, and Scheduler sends OIDC tokens with each request. No other caller can invoke the service.
C
Distractor review
Add a secret header to Cloud Scheduler requests and validate it in the Cloud Run application code.
Custom header validation is a fragile, application-level secret — not a proper authentication mechanism. The secret header could be brute-forced or leaked. OIDC-based IAM authentication is the correct approach.
D
Distractor review
Deploy the Cloud Run service in a VPC and use a VPC firewall rule to block all traffic except Cloud Scheduler.
Cloud Run services are not deployed in a VPC (they use VPC connectors for outbound access). VPC firewall rules don't control inbound access to Cloud Run.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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.
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Question 3
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Question 4
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Question 5
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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?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Disable unauthenticated invocations on the Cloud Run service, grant `roles/run.invoker` to the Scheduler SA, and configure Scheduler to use OIDC authentication. — To restrict Cloud Run to specific callers: 1) Set the service to require authentication (`--no-allow-unauthenticated`). 2) Grant the Cloud Scheduler service account `roles/run.invoker` on the specific Cloud Run service. 3) Configure Cloud Scheduler jobs to authenticate as a service account with invoker permissions when calling the Cloud Run URL. Cloud Scheduler can add OIDC tokens to HTTP requests automatically. This ensures only the authorized Scheduler SA can invoke the service.
What should I do if I get this ACE question wrong?
Identify which ACE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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.