Google PCA Designing for Security and Compliance Practice Question
This PCA practice question tests your understanding of designing for security and compliance. 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 wants to restrict access to their Cloud Storage bucket so that only requests from within a specific VPC network are allowed, and all other traffic (including internet) is denied. They also need to allow access from on-premises through a VPN. Which configuration should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the bucket with VPC Service Controls and enable Private Google Access
VPC Service Controls create a service perimeter around the bucket, and private Google Access allows resources in the VPC to use the bucket's private IP addresses. The on-premises network can connect via VPN using VPC Private Google Access. Public access is blocked by the perimeter. Firewall rules alone cannot block internet traffic to a public bucket.
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.
✓
Configure the bucket with VPC Service Controls and enable Private Google Access
Why this is correct
VPC Service Controls create a service perimeter, and Private Google Access allows access from VMs and on-premises via VPN.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use IAM conditions to restrict access based on IP address
Why it's wrong here
IAM conditions can restrict based on IP but do not prevent access from the internet if the bucket is publicly accessible.
✗
Use firewall rules to allow traffic only from the VPC IP range
Why it's wrong here
Firewall rules do not apply to Cloud Storage, which is a Google-managed service.
✗
Set up Cloud VPN and use Cloud NAT for egress
Why it's wrong here
Cloud NAT is for outbound traffic, not inbound access to a bucket.
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 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.
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: Configure the bucket with VPC Service Controls and enable Private Google Access — VPC Service Controls create a service perimeter around the bucket, and private Google Access allows resources in the VPC to use the bucket's private IP addresses. The on-premises network can connect via VPN using VPC Private Google Access. Public access is blocked by the perimeter. Firewall rules alone cannot block internet traffic to a public bucket.
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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