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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 a Google Cloud organization with several hundred projects. They are using VPC Service Controls to protect sensitive data in BigQuery. They have a service perimeter that includes the projects containing the sensitive datasets. Users in a separate perimeter (perimeter B) need to query a BigQuery dataset in the sensitive perimeter using federated queries from Cloud SQL. The users are authenticated via Cloud Identity and have appropriate IAM roles, but queries are failing. The Cloud SQL instance is in perimeter B. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The sensitive perimeter does not have an ingress rule to allow requests from the Cloud SQL service in perimeter B.
VPC Service Controls enforce perimeters that block all data access across perimeter boundaries by default. For a Cloud SQL instance in perimeter B to query BigQuery in the sensitive perimeter via federated queries, the sensitive perimeter must have an ingress rule explicitly allowing requests from the Cloud SQL service (or the VPC network) in perimeter B. Without this ingress rule, the request is denied at the perimeter boundary, regardless of IAM permissions.
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.
✓
The sensitive perimeter does not have an ingress rule to allow requests from the Cloud SQL service in perimeter B.
Why this is correct
An ingress rule is required to allow traffic from outside the perimeter.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Cloud SQL instance must be moved into the sensitive perimeter to access BigQuery.
Why it's wrong here
Moving the instance is not necessary; ingress rules can allow access.
✗
The users do not have the appropriate IAM role on the BigQuery dataset.
Why it's wrong here
The question states they have appropriate IAM roles.
✗
The BigQuery dataset does not have a corresponding table for export to Cloud SQL.
Why it's wrong here
Federated queries can access BigQuery tables directly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between IAM permissions and VPC Service Controls perimeter rules, leading candidates to incorrectly attribute the failure to missing IAM roles when the real issue is the absence of an ingress rule in the perimeter.
Detailed technical explanation
How to think about this question
VPC Service Controls use a deny-by-default model at the Google Cloud service perimeter boundary, enforced via the Access Context Manager API. Ingress rules allow traffic from specified identities or VPC networks into the perimeter, while egress rules control outbound traffic. For Cloud SQL federated queries, the Cloud SQL instance acts as a client; the BigQuery API call originates from Cloud SQL's underlying infrastructure, which must be allowed by an ingress rule in the sensitive perimeter. This is distinct from IAM, which governs identity-level permissions after perimeter access is granted.
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: The sensitive perimeter does not have an ingress rule to allow requests from the Cloud SQL service in perimeter B. — VPC Service Controls enforce perimeters that block all data access across perimeter boundaries by default. For a Cloud SQL instance in perimeter B to query BigQuery in the sensitive perimeter via federated queries, the sensitive perimeter must have an ingress rule explicitly allowing requests from the Cloud SQL service (or the VPC network) in perimeter B. Without this ingress rule, the request is denied at the perimeter boundary, regardless of IAM permissions.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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