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ACE Practice Question: A developer needs to use Application Default…
This ACE practice question tests your understanding of a developer needs to use application default…. 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.
A developer needs to use Application Default Credentials (ADC) in a local development environment to call the Cloud Translation API. They have already run `gcloud auth login`. What additional step is required to make ADC work correctly?
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
Run `gcloud config set account` to switch to the correct account.
Switching the active gcloud account does not affect ADC credentials stored separately for client libraries.
B
Best answer
Run `gcloud auth application-default login` to generate ADC credentials.
This command generates the `application_default_credentials.json` file that client libraries discover automatically via the ADC lookup chain.
C
Distractor review
Set the `GOOGLE_CLOUD_PROJECT` environment variable to the project ID.
This sets the project context but does not provide authentication credentials for the client library.
D
Distractor review
Download a service account JSON key and set `GOOGLE_APPLICATION_CREDENTIALS`.
This is a valid but more complex approach; the question asks for the step needed given `gcloud auth login` was already run — ADC login is simpler and preferred for local dev.
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.
Question 1
What is the correct order of the Google Cloud resource hierarchy from highest to lowest level?
Question 2
A compliance archive stores legal documents accessed at most once per quarter. Which Cloud Storage class minimizes storage cost while meeting that access pattern?
Question 3
Which gcloud command creates a Compute Engine VM named 'web-01' using the e2-medium machine type in zone us-central1-a?
Question 4
A team wants to receive an email alert when the average CPU utilization of VMs in a managed instance group exceeds 80% for more than 5 minutes. What should they create in Cloud Monitoring?
Question 5
A junior developer needs read-only access to all GCP resources in a project. Which IAM role grants the minimum permissions required?
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: Run `gcloud auth application-default login` to generate ADC credentials. — `gcloud auth login` sets user credentials for the gcloud CLI itself, but ADC used by client libraries requires `gcloud auth application-default login`. This command stores credentials at `~/.config/gcloud/application_default_credentials.json`, which the Google Auth Library automatically discovers via the ADC lookup chain. Without this step, client library calls will fail to authenticate even though the gcloud CLI works.
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.