- A
The container was deployed from source and Cloud Run requires a pre-built image.
Why wrong: Cloud Run supports source-based deployment.
- B
The container is listening on port 3000 instead of the port Cloud Run expects.
Cloud Run checks the PORT env var; if the container listens on a different port, health checks fail.
- C
The service requires authentication but --allow-unauthenticated was not set.
Why wrong: If authentication is required, the service would return 403, not fail to receive traffic.
- D
The container does not support concurrent requests.
Why wrong: Cloud Run can still route traffic even if concurrency is 1.
Question 271 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. 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.
An engineer deployed a container to Cloud Run but the service is not receiving traffic. The engineer checks the logs and finds no errors. The container listens on port 8080. What is the most likely cause of the issue?
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 container is listening on port 3000 instead of the port Cloud Run expects.
Cloud Run expects the container to listen on the port specified in the PORT environment variable (default 8080). If the container listens on a different port (e.g., 3000), Cloud Run will not route traffic to it. Option A is likely. Option B: Cloud Run can handle multiple requests per container (concurrency). Option C: Cloud Run requires a container image; source deployment works. Option D: Cloud Run can be invoked without authentication when --allow-unauthenticated is used.
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 container was deployed from source and Cloud Run requires a pre-built image.
Why it's wrong here
Cloud Run supports source-based deployment.
- ✓
The container is listening on port 3000 instead of the port Cloud Run expects.
Why this is correct
Cloud Run checks the PORT env var; if the container listens on a different port, health checks fail.
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 service requires authentication but --allow-unauthenticated was not set.
Why it's wrong here
If authentication is required, the service would return 403, not fail to receive traffic.
- ✗
The container does not support concurrent requests.
Why it's wrong here
Cloud Run can still route traffic even if concurrency is 1.
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.
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
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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 container is listening on port 3000 instead of the port Cloud Run expects. — Cloud Run expects the container to listen on the port specified in the PORT environment variable (default 8080). If the container listens on a different port (e.g., 3000), Cloud Run will not route traffic to it. Option A is likely. Option B: Cloud Run can handle multiple requests per container (concurrency). Option C: Cloud Run requires a container image; source deployment works. Option D: Cloud Run can be invoked without authentication when --allow-unauthenticated is used.
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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