This ACE practice question tests your understanding of configuring access and security. 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.
Which THREE are valid ways to authenticate a user for gcloud commands? (Choose three.)
API key
Why wrong: API keys are for simple API calls, not gcloud authentication.
OAuth2 access token
Used after 'gcloud auth login' or obtained via other means.
Application Default Credentials
ADC is used by client libraries and gcloud when available.
Service account key file
Used with 'gcloud auth activate-service-account'.
IdP token
Why wrong: Used for workload identity federation, not directly for gcloud CLI.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
OAuth2 access token
Option B is correct because an OAuth2 access token can be used to authenticate gcloud commands by passing it with the `--access-token-file` flag or via the `gcloud auth print-access-token` command. This token is obtained from an authorization server and provides temporary, scoped access to Google Cloud resources without requiring a long-lived credential like a service account key.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
API key
Why it's wrong here
API keys are for simple API calls, not gcloud authentication.
OAuth2 access token
Why this is correct
Used after 'gcloud auth login' or obtained via other means.
Related concept
Read the scenario before looking for a memorised answer.
Application Default Credentials
Why this is correct
ADC is used by client libraries and gcloud when available.
Related concept
Read the scenario before looking for a memorised answer.
Service account key file
Why this is correct
Used with 'gcloud auth activate-service-account'.
Related concept
Read the scenario before looking for a memorised answer.
IdP token
Why it's wrong here
Used for workload identity federation, not directly for gcloud CLI.
Common exam traps
Google Cloud often tests the misconception that API keys are a valid authentication method for gcloud commands, but API keys only identify projects and are not accepted by gcloud for user or service account authentication.
Detailed technical explanation
Under the hood, gcloud uses the Google APIs Client Library to make authenticated HTTP requests, and it supports multiple credential types via the `google-auth` library. Application Default Credentials (ADC) automatically searches for credentials in a well-defined order: first the `GOOGLE_APPLICATION_CREDENTIALS` environment variable, then the default service account on Compute Engine, and finally the user credentials from `gcloud auth application-default login`. Service account key files are JSON files containing a private key used to sign JWT assertions that are exchanged for OAuth2 tokens, and they are commonly used in CI/CD pipelines.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
The correct answer is: OAuth2 access token — Option B is correct because an OAuth2 access token can be used to authenticate gcloud commands by passing it with the `--access-token-file` flag or via the `gcloud auth print-access-token` command. This token is obtained from an authorization server and provides temporary, scoped access to Google Cloud resources without requiring a long-lived credential like a service account key.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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