The correct answer is to create a Cloud KMS key ring and a key with a rotation period set to 7776000 seconds, which equals 90 days. This works because Cloud KMS enables automatic key rotation for customer-managed encryption keys (CMEK) by specifying the rotation period in seconds at key creation; after that interval, Cloud KMS generates a new primary key version without manual intervention, ensuring all new data written to Cloud Storage is encrypted with the latest version. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding that CMEK rotation is configured at the key level in Cloud KMS, not on the bucket itself, and a common trap is confusing seconds with days or trying to set rotation on the bucket’s encryption configuration. Remember the mnemonic: 90 days = 7776000 seconds—think of the seven 7s as a lucky streak for security compliance.
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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 wants to ensure that all data stored in Cloud Storage buckets is encrypted at rest using a customer-managed key that is automatically rotated every 90 days. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Cloud KMS key ring and a key with rotation period set to 7776000s (90 days).
Option A is correct because Cloud KMS allows you to create a customer-managed encryption key (CMEK) with an automatic rotation period of 7776000 seconds (90 days). When you set the rotation period on a key, Cloud KMS automatically rotates the key material at the specified interval, ensuring that all data encrypted with that key is protected by a new key version without manual intervention. This satisfies the requirement for customer-managed keys with automatic rotation.
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.
✓
Create a Cloud KMS key ring and a key with rotation period set to 7776000s (90 days).
Why this is correct
Cloud KMS supports automatic rotation of customer-managed keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use customer-supplied encryption keys (CSEK) and update them manually every 90 days.
Why it's wrong here
CSEK does not support automatic rotation; the customer must re-encrypt data.
✗
Use default Google-managed encryption keys.
Why it's wrong here
Google-managed keys are not customer-managed and cannot be rotated manually.
✗
Use Cloud HSM to generate a key and implement a custom rotation script.
Why it's wrong here
Cloud HSM keys without Cloud KMS do not have built-in rotation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between automatic rotation (Cloud KMS CMEK with rotation period) and manual rotation (CSEK or custom scripts), leading candidates to choose manual or HSM-based options that lack built-in automatic rotation.
Detailed technical explanation
How to think about this question
Cloud KMS key rotation works by creating a new key version (with new cryptographic material) while retaining older versions for decryption of existing data. The rotation period is defined in seconds (e.g., 7776000 for 90 days) and triggers automatic creation of a new primary key version. When you use a CMEK with Cloud Storage, the bucket is configured with the key's resource name, and Cloud Storage automatically uses the latest primary version for encryption, while older versions remain available for decryption of data encrypted before rotation.
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 — 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: Create a Cloud KMS key ring and a key with rotation period set to 7776000s (90 days). — Option A is correct because Cloud KMS allows you to create a customer-managed encryption key (CMEK) with an automatic rotation period of 7776000 seconds (90 days). When you set the rotation period on a key, Cloud KMS automatically rotates the key material at the specified interval, ensuring that all data encrypted with that key is protected by a new key version without manual intervention. This satisfies the requirement for customer-managed keys with automatic rotation.
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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Question Discussion
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