Google PCA Designing for Security and Compliance Practice Question
This PCA practice question tests your understanding of designing for security and compliance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 needs to ensure that only applications running in a specific GKE namespace can access a Cloud Storage bucket. Which approach 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
✓
Use Workload Identity to bind the Kubernetes service account to a GCP service account with appropriate IAM roles
Workload Identity allows binding a Kubernetes service account to a GCP service account. Then, IAM can be granted to that GCP service account for the Cloud Storage bucket.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 Workload Identity to bind the Kubernetes service account to a GCP service account with appropriate IAM roles
Why this is correct
Workload Identity allows mapping a KSA to a GSA, enabling fine-grained access control based on namespace.
Use VPC Service Controls to restrict the bucket to only the GKE cluster's VPC
Why it's wrong here
VPC Service Controls restrict based on network, not namespace.
✗
Use firewall rules to allow traffic only from the GKE cluster's pod CIDR
Why it's wrong here
Firewall rules cannot distinguish between namespaces.
✗
Use Cloud Armor to restrict access based on source IP
Why it's wrong here
Cloud Armor is for HTTP(S) load balancers, not Cloud Storage access.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCA subnetting questions on CIDR, address ranges, and subnet selection.
Designing for Security and Compliance — This question tests Designing for Security and Compliance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use Workload Identity to bind the Kubernetes service account to a GCP service account with appropriate IAM roles — Workload Identity allows binding a Kubernetes service account to a GCP service account. Then, IAM can be granted to that GCP service account for the Cloud Storage bucket.
What should I do if I get this PCA question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCA subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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