- A
VPC Service Controls creating a perimeter around the GKE cluster
Why wrong: VPC Service Controls protect GCP API services from data exfiltration — they don't provide browser-based identity authentication for web applications.
- B
Cloud Identity-Aware Proxy (IAP) configured on the load balancer in front of the GKE service
IAP enforces Google identity authentication at the load balancer layer. Users must sign in with an authorized Google account — rejecting all unauthenticated requests before they reach the application.
- C
Firebase Authentication SDK integrated into the web application frontend
Why wrong: Firebase Authentication is an app-level identity solution that requires code integration — it doesn't enforce access at the infrastructure layer like IAP does.
- D
Cloud Armor with a Google Workspace IP allowlist
Why wrong: Employee IP addresses are dynamic (home, office, mobile) — IP allowlisting doesn't provide reliable identity-based access control.
Quick Answer
Cloud Identity-Aware Proxy (IAP) is the correct choice because it provides identity-based access without a VPN by enforcing authentication and authorization at the application layer, using an HTTPS load balancer to verify each request against Google Workspace credentials before traffic reaches the GKE service. This approach leverages Google’s global infrastructure to block unauthenticated users at the edge, eliminating the need for a VPN or public internet exposure. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of how IAP differs from network-level controls like Cloud VPN or Cloud NAT; a common trap is assuming you need a bastion host or private IP connectivity when the requirement is purely identity-based access. Remember the key distinction: IAP controls access by who you are, not where you are. A useful memory tip is to think of IAP as the “bouncer at the door” checking IDs before anyone enters the building, rather than building a private tunnel to the venue.
Google ACE Configuring access and security Practice Question
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.
An internal web application running on GKE must be accessible only to employees who are authenticated with the company's Google Workspace account — without exposing it to the internet or using a VPN. Which GCP service provides identity-based access without a VPN?
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
Cloud Identity-Aware Proxy (IAP) configured on the load balancer in front of the GKE service
Cloud Identity-Aware Proxy (IAP) is the correct choice because it enforces identity-based access control at the application layer, verifying that users are authenticated via Google Workspace before allowing traffic to reach the GKE service through an HTTPS load balancer. This eliminates the need for a VPN or public internet exposure by leveraging Google's global infrastructure to authenticate and authorize each request based on the user's identity and context.
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.
- ✗
VPC Service Controls creating a perimeter around the GKE cluster
Why it's wrong here
VPC Service Controls protect GCP API services from data exfiltration — they don't provide browser-based identity authentication for web applications.
- ✓
Cloud Identity-Aware Proxy (IAP) configured on the load balancer in front of the GKE service
Why this is correct
IAP enforces Google identity authentication at the load balancer layer. Users must sign in with an authorized Google account — rejecting all unauthenticated requests before they reach the application.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Firebase Authentication SDK integrated into the web application frontend
Why it's wrong here
Firebase Authentication is an app-level identity solution that requires code integration — it doesn't enforce access at the infrastructure layer like IAP does.
- ✗
Cloud Armor with a Google Workspace IP allowlist
Why it's wrong here
Employee IP addresses are dynamic (home, office, mobile) — IP allowlisting doesn't provide reliable identity-based access control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse network-level controls (VPC Service Controls, Cloud Armor IP allowlists) with identity-based access, or they assume client-side authentication (Firebase) is sufficient for server-side access control, missing that IAP is the only service that combines identity verification with network edge enforcement without a VPN.
Detailed technical explanation
How to think about this question
Cloud IAP works by intercepting HTTPS requests at the Google Cloud load balancer, redirecting unauthenticated users to Google's OAuth 2.0 authentication endpoint, and then validating the resulting identity token against a configured OAuth client ID and service account. Under the hood, IAP uses signed headers (X-Goog-Authenticated-User-Email and X-Goog-IAP-JWT-Assertion) to pass verified identity information to the backend, which the GKE application must validate to prevent direct access bypassing the load balancer. A real-world scenario involves a company with a hybrid workforce where employees connect from untrusted networks; IAP allows granular access based on user or group membership in Google Workspace, without requiring a VPN or static IP ranges.
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.
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FAQ
Questions learners often ask
What does this ACE question test?
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Identity-Aware Proxy (IAP) configured on the load balancer in front of the GKE service — Cloud Identity-Aware Proxy (IAP) is the correct choice because it enforces identity-based access control at the application layer, verifying that users are authenticated via Google Workspace before allowing traffic to reach the GKE service through an HTTPS load balancer. This eliminates the need for a VPN or public internet exposure by leveraging Google's global infrastructure to authenticate and authorize each request based on the user's identity and context.
What should I do if I get this ACE 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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Last reviewed: Jun 11, 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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