- A
DateShiftConfig
Why wrong: DateShiftConfig is used to shift dates by a random number of days, not for masking phone numbers.
- B
MaskingConfig
MaskingConfig irreversibly replaces characters (like phone digits) with a fixed character, preserving format and length.
- C
CryptoReplaceFfxFpeConfig
Why wrong: CryptoReplaceFfxFpeConfig is a reversible format-preserving encryption; it can be reversed, which does not meet the 'cannot be reversed' requirement.
- D
BucketingConfig
Why wrong: BucketingConfig replaces a value with a bucket label (e.g., range), not for character-level masking.
Question 985 of 1,000
PCSE Ensuring Data Protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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 uses Cloud DLP to de-identify a dataset containing customer phone numbers. They need to replace each phone number with a consistently masked value that preserves the format (e.g., XXX-XXX-1234) but cannot be reversed. Which de-identification transform should they use?
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
✓
MaskingConfig
MaskingConfig is the correct choice because it irreversibly replaces characters in a string while preserving the format. In this scenario, the customer phone numbers need to be consistently masked (e.g., replacing all but the last four digits with 'X') so that the output maintains the pattern XXX-XXX-1234, and the original value cannot be recovered. MaskingConfig supports character-level replacement with a fixed character (like 'X') and can preserve the original length and formatting, which meets the requirement for a non-reversible, format-preserving de-identification.
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.
- ✗
DateShiftConfig
Why it's wrong here
DateShiftConfig is used to shift dates by a random number of days, not for masking phone numbers.
- ✓
MaskingConfig
Why this is correct
MaskingConfig irreversibly replaces characters (like phone digits) with a fixed character, preserving format and length.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
CryptoReplaceFfxFpeConfig
Why it's wrong here
CryptoReplaceFfxFpeConfig is a reversible format-preserving encryption; it can be reversed, which does not meet the 'cannot be reversed' requirement.
- ✗
BucketingConfig
Why it's wrong here
BucketingConfig replaces a value with a bucket label (e.g., range), not for character-level masking.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google often tests the distinction between reversible (CryptoReplaceFfxFpeConfig) and irreversible (MaskingConfig) transforms, and candidates mistakenly choose CryptoReplaceFfxFpeConfig because it preserves format, but they overlook the 'cannot be reversed' requirement.
Detailed technical explanation
How to think about this question
Under the hood, MaskingConfig in Cloud DLP operates by specifying a masking character (e.g., 'X') and a number of characters to mask from the left or right, or a custom character mask. It can also handle complex formats by using a regex pattern to identify the portion to mask, ensuring that non-numeric characters like hyphens are preserved. In a real-world scenario, this is critical for compliance with PCI DSS or GDPR when displaying customer data in logs or reports, where the masked value must be consistent across multiple occurrences of the same phone number to prevent inference attacks.
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 — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this PCSE question test?
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: MaskingConfig — MaskingConfig is the correct choice because it irreversibly replaces characters in a string while preserving the format. In this scenario, the customer phone numbers need to be consistently masked (e.g., replacing all but the last four digits with 'X') so that the output maintains the pattern XXX-XXX-1234, and the original value cannot be recovered. MaskingConfig supports character-level replacement with a fixed character (like 'X') and can preserve the original length and formatting, which meets the requirement for a non-reversible, format-preserving de-identification.
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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Last reviewed: Jul 4, 2026
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