The answer is Workload Identity Federation. This is the correct choice because it enables on-premises Active Directory users to authenticate to Google Cloud without any password synchronization, using a federated identity model where the on-premises identity provider issues tokens that are exchanged for short-lived Google Cloud credentials via the Security Token Service. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of identity federation versus directory synchronization—a common trap is confusing this with Google Cloud Directory Sync or AD FS, which either sync hashes or require a proxy. The key distinction is that Workload Identity Federation keeps passwords strictly on-premises, relying on token exchange rather than credential replication. For a memory tip, think “no sync, just swap”—the on-premises IdP issues a token, and the STS swaps it for a GCP credential, leaving passwords untouched.
PCSE Practice Question: Configuring access within a cloud solution environment
This PCSE practice question tests your understanding of configuring access within a cloud solution environment. 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 company has an on-premises Active Directory and wants to allow on-premises users to access Google Cloud resources using their existing credentials without synchronizing passwords to Google Cloud. Which identity federation solution should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Workload Identity Federation
Workload Identity Federation allows on-premises users to authenticate to Google Cloud using their existing Active Directory credentials without synchronizing passwords. It uses a federated identity model where the on-premises identity provider (IdP) issues tokens that are exchanged for Google Cloud short-lived credentials via the Security Token Service (STS), enabling access to Google Cloud resources while keeping passwords on-premises.
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.
✗
Service Account Key Exchange
Why it's wrong here
This is not a standard GCP feature; key exchange is not recommended.
✓
Workload Identity Federation
Why this is correct
It enables on-premises or multi-cloud workloads to impersonate a service account without a key.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud Identity
Why it's wrong here
Cloud Identity is a directory service, not a federation solution for existing AD credentials.
✗
Identity Platform
Why it's wrong here
Identity Platform is a customer identity and access management (CIAM) service, not for AD federation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between Cloud Identity (which requires user directory management in Google) and Workload Identity Federation (which allows external IdP federation without password sync), leading candidates to mistakenly choose Cloud Identity because they associate it with identity management for enterprise users.
Detailed technical explanation
How to think about this question
Workload Identity Federation leverages the OAuth 2.0 Token Exchange specification (RFC 8693) to allow an external identity provider (e.g., Active Directory Federation Services) to issue a SAML 2.0 or OIDC token, which is then exchanged for a Google Cloud access token via the STS endpoint (sts.googleapis.com). The federated identity is mapped to a Google Cloud service account using attribute conditions, enabling fine-grained access control without storing any user passwords in Google Cloud. In a real-world scenario, an organization can configure AD FS as the IdP, and users authenticate on-premises, receiving a SAML assertion that is exchanged for a Google Cloud token, allowing them to access resources like Cloud Storage or BigQuery.
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.
Configuring access within a cloud solution environment — This question tests Configuring access within a cloud solution environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Workload Identity Federation — Workload Identity Federation allows on-premises users to authenticate to Google Cloud using their existing Active Directory credentials without synchronizing passwords. It uses a federated identity model where the on-premises identity provider (IdP) issues tokens that are exchanged for Google Cloud short-lived credentials via the Security Token Service (STS), enabling access to Google Cloud resources while keeping passwords on-premises.
What should I do if I get this PCSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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