- A
roles/iam.serviceAccountUser
Why wrong: roles/iam.serviceAccountUser allows management of service accounts, not access to IAP-protected resources.
- B
roles/iap.tunnelResourceAccessor
Why wrong: roles/iap.tunnelResourceAccessor grants access to IAP TCP forwarding, not HTTPS resources.
- C
roles/iap.httpsResourceAccessor
roles/iap.httpsResourceAccessor (IAP-secured Web App User) is the correct role for accessing HTTPS applications behind IAP.
- D
roles/compute.viewer
Why wrong: roles/compute.viewer allows read-only access to Compute Engine resources but does not grant access through IAP.
Question 725 of 1,000
Google PCA Identity-Aware Proxy (IAP) Practice Question
This PCA practice question tests your understanding of designing for security and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: identity-Aware Proxy (IAP). 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 security engineer wants to configure Identity-Aware Proxy (IAP) for an HTTPS load-balanced application to enforce zero-trust access. Users will authenticate with their Google accounts. What is the minimum set of IAM roles needed for a user to access the application behind IAP?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
✓
roles/iap.httpsResourceAccessor
To access an application protected by IAP over HTTPS, a user must have the IAP-secured Web App User role (roles/iap.httpsResourceAccessor) on the resource. This role grants permission to access the resource through IAP. The other roles are not sufficient: roles/iam.serviceAccountUser is for managing service accounts, roles/iap.tunnelResourceAccessor is for TCP forwarding, and roles/compute.viewer only allows viewing Compute Engine resources, not accessing the application.
Key principle: Identity-Aware Proxy (IAP)
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
roles/iam.serviceAccountUser
Why it's wrong here
roles/iam.serviceAccountUser allows management of service accounts, not access to IAP-protected resources.
- ✗
roles/iap.tunnelResourceAccessor
- ✓
roles/iap.httpsResourceAccessor
Why this is correct
roles/iap.httpsResourceAccessor (IAP-secured Web App User) is the correct role for accessing HTTPS applications behind IAP.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Identity-Aware Proxy (IAP)
- ✗
roles/compute.viewer
Why it's wrong here
roles/compute.viewer allows read-only access to Compute Engine resources but does not grant access through IAP.
Common exam traps
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.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Identity-Aware Proxy (IAP)
- IAP-secured Web App User (roles/iap.httpsResourceAccessor)
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
Identity-Aware Proxy (IAP)
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.
Review identity-Aware Proxy (IAP), then practise related PCA questions on the same topic to reinforce the concept.
- →
Designing for Security and Compliance — study guide chapter
Learn the concepts, then practise the questions
- →
Designing for Security and Compliance practice questions
Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this PCA question test?
Designing for Security and Compliance — This question tests Designing for Security and Compliance — Identity-Aware Proxy (IAP).
What is the correct answer to this question?
The correct answer is: roles/iap.httpsResourceAccessor — To access an application protected by IAP over HTTPS, a user must have the IAP-secured Web App User role (roles/iap.httpsResourceAccessor) on the resource. This role grants permission to access the resource through IAP. The other roles are not sufficient: roles/iam.serviceAccountUser is for managing service accounts, roles/iap.tunnelResourceAccessor is for TCP forwarding, and roles/compute.viewer only allows viewing Compute Engine resources, not accessing the application.
What should I do if I get this PCA question wrong?
Review identity-Aware Proxy (IAP), then practise related PCA questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Identity-Aware Proxy (IAP)
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Last reviewed: Jul 4, 2026
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