- A
Use Cloud DLP to mask patient identifiers consistently across all tables.
Consistent masking (e.g., hashing) allows joins while protecting identities.
- B
Apply differential privacy to all queries using the Differential Privacy library in BigQuery.
Why wrong: Differential privacy adds noise and may not preserve the ability to join accurately on a per-patient basis.
- C
Enable BigQuery column-level security to restrict access to identifiers.
Why wrong: Column-level security restricts access but does not prevent re-identification if the data is exposed.
- D
Store patient identifiers in a separate, access-controlled dataset and join using SQL.
Why wrong: Storing identifiers separately still allows re-identification if combined; this increases risk.
- E
Use Cloud DLP to tokenize patient identifiers with a consistent token.
Tokenization with a consistent token allows joining across tables while preventing re-identification.
PCSE Supporting Compliance Requirements Practice Question
This PCSE practice question tests your understanding of supporting compliance requirements. 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 healthcare company stores de-identified patient data in BigQuery for analytics. They must comply with HIPAA and ensure that re-identification is not possible. They also need to be able to join data on a per-patient basis for longitudinal studies. Which TWO strategies should they implement? (Choose 2)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use Cloud DLP to mask patient identifiers consistently across all tables.
Tokenization or consistent masking allows longitudinal joins while de-identifying data. Other methods either risk re-identification or break join capability.
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 Cloud DLP to mask patient identifiers consistently across all tables.
Why this is correct
Consistent masking (e.g., hashing) allows joins while protecting identities.
Related concept
CIDR notation defines the prefix length.
- ✗
Apply differential privacy to all queries using the Differential Privacy library in BigQuery.
Why it's wrong here
Differential privacy adds noise and may not preserve the ability to join accurately on a per-patient basis.
- ✗
Enable BigQuery column-level security to restrict access to identifiers.
Why it's wrong here
Column-level security restricts access but does not prevent re-identification if the data is exposed.
- ✗
Store patient identifiers in a separate, access-controlled dataset and join using SQL.
Why it's wrong here
Storing identifiers separately still allows re-identification if combined; this increases risk.
- ✓
Use Cloud DLP to tokenize patient identifiers with a consistent token.
Why this is correct
Tokenization with a consistent token allows joining across tables while preventing re-identification.
Related concept
CIDR notation defines the prefix length.
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 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.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCSE subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this PCSE question test?
Supporting Compliance Requirements — This question tests Supporting Compliance Requirements — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use Cloud DLP to mask patient identifiers consistently across all tables. — Tokenization or consistent masking allows longitudinal joins while de-identifying data. Other methods either risk re-identification or break join capability.
What should I do if I get this PCSE 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 PCSE 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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Last reviewed: Jul 4, 2026
This PCSE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCSE exam.
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