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Managing service incidents →hardMultiple ChoiceObjective-mapped

PCDOE Managing service incidents Practice Question

This PCDOE practice question tests your understanding of managing service incidents. 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.

Exhibit

Refer to the exhibit.
```json
{
  "textPayload": "GET / 404 Not Found",
  "resource": {
    "type": "cloud_run_revision",
    "labels": {
      "service_name": "my-service",
      "revision_name": "my-service-00001-abc"
    }
  },
  "httpRequest": {
    "status": 404,
    "requestMethod": "GET"
  }
}
```

Based on the log entry, what is the most likely cause of the 404 error?

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.

Question 1hardmultiple choice

Full question →

Exhibit

Refer to the exhibit.
```json
{
  "textPayload": "GET / 404 Not Found",
  "resource": {
    "type": "cloud_run_revision",
    "labels": {
      "service_name": "my-service",
      "revision_name": "my-service-00001-abc"
    }
  },
  "httpRequest": {
    "status": 404,
    "requestMethod": "GET"
  }
}
```

A
The user does not have permission to invoke the service.
Why wrong: Permission issues result in 403 Forbidden, not 404.
B
The revision is not configured with the correct container port.
A 404 often means the container is listening on a different port than what Cloud Run expects.
C
The Cloud Run service is not autoscaling properly, causing requests to be dropped.
Why wrong: Autoscaling issues typically produce 503 or 500 errors, not 404.
D
The service has run out of memory.
Why wrong: Out-of-memory errors typically cause 500 or 502 errors.

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

✓

The revision is not configured with the correct container port.

A 404 error on Cloud Run typically indicates that the request reached the service but no container is listening on the configured port. If the revision's container port does not match the port the application is actually serving on (e.g., the app listens on 8080 but the revision is configured for 3000), Cloud Run's HTTP ingress will fail to route traffic, resulting in a 404. This is the most likely cause because the error is not a permission or resource issue, but a routing mismatch at the container level.

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 user does not have permission to invoke the service.
Why it's wrong here
Permission issues result in 403 Forbidden, not 404.
✓
The revision is not configured with the correct container port.
Why this is correct
A 404 often means the container is listening on a different port than what Cloud Run expects.
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 Cloud Run service is not autoscaling properly, causing requests to be dropped.
Why it's wrong here
Autoscaling issues typically produce 503 or 500 errors, not 404.
✗
The service has run out of memory.
Why it's wrong here
Out-of-memory errors typically cause 500 or 502 errors.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Google Cloud often tests the distinction between HTTP status codes (404 vs 403 vs 503 vs 500) and their root causes in serverless environments, trapping candidates who confuse permission errors with routing misconfigurations.

Detailed technical explanation

How to think about this question

Cloud Run uses the `containerPort` field in the revision template to set the `PORT` environment variable and configure the underlying Knative serving layer's HTTP routing. If the application does not bind to the same port, the Knative queue proxy cannot forward requests to the user container, resulting in a 404 from the proxy itself. This is a common misconfiguration when deploying containers that listen on a different port (e.g., 8080 by default in many frameworks) than the one specified in the YAML or gcloud command.

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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this PCDOE question test?

Managing service incidents — This question tests Managing service incidents — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The revision is not configured with the correct container port. — A 404 error on Cloud Run typically indicates that the request reached the service but no container is listening on the configured port. If the revision's container port does not match the port the application is actually serving on (e.g., the app listens on 8080 but the revision is configured for 3000), Cloud Run's HTTP ingress will fail to route traffic, resulting in a 404. This is the most likely cause because the error is not a permission or resource issue, but a routing mismatch at the container level.

What should I do if I get this PCDOE question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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.

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Last reviewed: Jun 30, 2026

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