- A
The function uses a runtime that does not support HTTP triggers
Why wrong: All runtimes support HTTP triggers.
- B
The function does not have the Cloud Functions Invoker role for allUsers
Without the invoker role for unauthenticated users, IAM returns 403.
- C
The function is not deployed in the correct region
Why wrong: Wrong region would cause a 404 or connection error, not 403.
- D
The function URL is malformed
Why wrong: Malformed URL would cause a 404 or different error.
Question 537 of 1,000
Google ACE Deploying and Implementing a Cloud Solution Practice Question
This ACE practice question tests your understanding of deploying and implementing a cloud solution. 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.
A developer created a Cloud Function with HTTP trigger. When they send a POST request to the function's URL, they get a 403 Forbidden error. The function is deployed with --allow-unauthenticated flag? What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
The function does not have the Cloud Functions Invoker role for allUsers
The --allow-unauthenticated flag only allows unauthenticated invocations for Cloud Functions (v1) if IAM policy is also set. However, for Cloud Functions (2nd gen) and Cloud Run, --allow-unauthenticated sets the IAM policy. The 403 error often means the function does not have the allUsers invoker role. The developer may have omitted the --allow-unauthenticated flag or used a different flag. The function URL is correct; missing region causes a different error. Wrong runtime would cause a different error.
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.
- ✗
The function uses a runtime that does not support HTTP triggers
Why it's wrong here
All runtimes support HTTP triggers.
- ✓
The function does not have the Cloud Functions Invoker role for allUsers
Why this is correct
Without the invoker role for unauthenticated users, IAM returns 403.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The function is not deployed in the correct region
Why it's wrong here
Wrong region would cause a 404 or connection error, not 403.
- ✗
The function URL is malformed
Why it's wrong here
Malformed URL would cause a 404 or different error.
Common exam traps
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.
Detailed technical explanation
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.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
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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Deploying and Implementing a Cloud Solution — study guide chapter
Learn the concepts, then practise the questions
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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: The function does not have the Cloud Functions Invoker role for allUsers — The --allow-unauthenticated flag only allows unauthenticated invocations for Cloud Functions (v1) if IAM policy is also set. However, for Cloud Functions (2nd gen) and Cloud Run, --allow-unauthenticated sets the IAM policy. The 403 error often means the function does not have the allUsers invoker role. The developer may have omitted the --allow-unauthenticated flag or used a different flag. The function URL is correct; missing region causes a different error. Wrong runtime would cause a different error.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 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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