The correct answer is to grant the third-party project access to the perimeter via an access level. This works because VPC Service Controls rely on access levels to define the conditions under which traffic from outside the service perimeter is allowed, using attributes like client identity, IP address, or device policy. By creating an access level that includes the third-party application’s project or IP range, you explicitly authorize external access to BigQuery while keeping the perimeter’s data exfiltration protections active. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding that access levels are the granular gate for external ingress, not a perimeter removal—a common trap is confusing this with simply adding the project to the perimeter’s allowed projects list, which doesn’t control external identity. Remember the mnemonic: “Access levels are the bouncer, the perimeter is the club.”
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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. 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 uses VPC Service Controls to protect data in BigQuery and Cloud Storage. They need to allow a third-party application running outside the service perimeter to query BigQuery datasets within the perimeter. What should they configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Grant the third-party project access to the perimeter via an access level.
Option B is correct because VPC Service Controls use access levels to define which client identities, IP addresses, or device characteristics are allowed to access protected resources from outside the service perimeter. By configuring an access level that includes the third-party application's project or IP range, the company can grant explicit, policy-based access to BigQuery datasets without removing the perimeter's data exfiltration protections.
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.
✗
Use private Google Access with a VPC network to allow the third-party.
Why it's wrong here
Private Google Access enables on-premises access to Google APIs, not external application access.
✓
Grant the third-party project access to the perimeter via an access level.
Why this is correct
Access levels can be used to allow ingress from external identities or IPs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a service perimeter bridge between the third-party project and the protected project.
Why it's wrong here
Service perimeter bridges allow sharing between perimeters, not external access.
✗
Set up a VPC peering connection between the third-party VPC and the VPC hosting the resources.
Why it's wrong here
VPC peering does not bypass VPC Service Controls.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse VPC peering or Private Google Access with VPC Service Controls, assuming network-level connectivity is sufficient to bypass API-level perimeter enforcement, when in fact only access levels or perimeter membership can grant external access.
Detailed technical explanation
How to think about this question
VPC Service Controls enforce a deny-by-default model at the Google Cloud API frontend, intercepting requests before they reach the resource. Access levels are defined using the Access Context Manager and can be based on attributes such as IP subnet, device policy, or identity (e.g., service accounts). When a request originates from outside the perimeter, the access level is evaluated; if it matches, the request is allowed, but data exfiltration to unauthorized destinations is still blocked by the perimeter's egress rules.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
Ensuring data protection — This question tests Ensuring data protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Grant the third-party project access to the perimeter via an access level. — Option B is correct because VPC Service Controls use access levels to define which client identities, IP addresses, or device characteristics are allowed to access protected resources from outside the service perimeter. By configuring an access level that includes the third-party application's project or IP range, the company can grant explicit, policy-based access to BigQuery datasets without removing the perimeter's data exfiltration protections.
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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