Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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 company uses Cloud Storage for backups of on-premises databases. They want to ensure that data is protected against accidental deletion or modification by users. Which combination of features should they enable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Object versioning and bucket locking with retention policy.
Option D is correct because object versioning protects against accidental deletion or modification by preserving all versions of an object, while a bucket lock with a retention policy enforces a minimum retention period, preventing premature deletion or alteration. Together, they provide both recoverability and immutable compliance, which is essential for backup data integrity.
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.
✗
Object versioning and lifecycle management to delete old versions.
Why it's wrong here
Lifecycle management may delete old versions, not protect against deletion.
✗
Bucket locking with retention policy and bucket-level IAM restrictions.
Why it's wrong here
IAM restrictions are not sufficient to prevent deletion by authorized users.
✗
Bucket locking with retention policy and object holds.
Why it's wrong here
Object holds are per-object and not as comprehensive as versioning.
✓
Object versioning and bucket locking with retention policy.
Read the scenario before looking for a memorised answer.
✗
Object versioning and IAM conditions restricting access to specific IP ranges.
Why it's wrong here
IAM conditions limit access but do not prevent deletion if access is granted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that object holds alone provide sufficient immutability, but they are per-object and temporary, whereas a bucket lock with a retention policy provides a bucket-wide, locked-in immutable period that cannot be bypassed even by the bucket owner.
Detailed technical explanation
How to think about this question
Under the hood, object versioning in Cloud Storage stores each object update as a separate version, allowing retrieval of noncurrent versions via the `generation` and `metageneration` parameters. A bucket lock with a retention policy uses a `retentionPolicy` object that, once locked, cannot be removed or shortened, and any attempt to delete or overwrite an object before the retention period expires returns a 403 error. In a real-world scenario, if a backup database file is accidentally overwritten, versioning enables restoration of the previous generation, while the retention policy ensures the file cannot be deleted during the compliance window.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Object versioning and bucket locking with retention policy. — Option D is correct because object versioning protects against accidental deletion or modification by preserving all versions of an object, while a bucket lock with a retention policy enforces a minimum retention period, preventing premature deletion or alteration. Together, they provide both recoverability and immutable compliance, which is essential for backup data integrity.
What should I do if I get this PCA 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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Question Discussion
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