Google PCA Designing for Security and Compliance Practice Question
This PCA practice question tests your understanding of designing for security and compliance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 security engineer wants to prevent data exfiltration from a project 'prod-data' by ensuring that only approved VPC networks can access BigQuery datasets. Which GCP service should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VPC Service Controls
VPC Service Controls create service perimeters that protect resources by restricting access from outside the perimeter. They can be used to limit BigQuery access to specific VPC networks or IP ranges.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Private Google Access
Why it's wrong here
Private Google Access allows on-premises or VM access to Google APIs using private IPs, but does not restrict data exfiltration.
✗
Cloud Armor
Why it's wrong here
Cloud Armor is for HTTP(S) load balancing protection, not for data exfiltration prevention.
✗
Cloud NAT
Why it's wrong here
Cloud NAT provides outbound internet access, not inbound access control.
✓
VPC Service Controls
Why this is correct
VPC Service Controls creates perimeters to prevent data exfiltration from managed services like BigQuery.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
Designing for Security and Compliance — This question tests Designing for Security and Compliance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: VPC Service Controls — VPC Service Controls create service perimeters that protect resources by restricting access from outside the perimeter. They can be used to limit BigQuery access to specific VPC networks or IP ranges.
What should I do if I get this PCA question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCA NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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