The answer is Customer-Managed Encryption Keys (CMEK) with Cloud KMS, which enables automated key rotation with a configurable 30-day schedule. This is correct because Cloud KMS allows you to set a rotation period directly on the key, and when combined with CMEK, the service automatically generates a new key version at the specified interval without any manual intervention, ensuring all Cloud Storage objects encrypted under that key benefit from the new version. On the Google Professional Cloud Security Engineer exam, this question tests your ability to distinguish between CMEK, CSEK, and Google-managed encryption keys, with a common trap being that CSEK requires manual rotation and does not support automated scheduling. Remember that CMEK plus Cloud KMS is the only option that gives you both control and automation for rotation policies. A helpful memory tip: CMEK means “Control My Encryption Keys,” and Cloud KMS handles the “Key Management Schedule.”
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 company needs to ensure that all data stored in Cloud Storage is encrypted using a key that is rotated every 30 days. Which encryption option should they choose to meet this requirement with automated rotation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Customer-Managed Encryption Key (CMEK) using Cloud KMS
Option B is correct because Customer-Managed Encryption Keys (CMEK) with Cloud KMS allow you to control and rotate encryption keys on a schedule. Cloud KMS supports automatic key rotation with a configurable rotation period (e.g., every 30 days), meeting the requirement without manual intervention.
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.
✗
Cloud External Key Manager (EKM)
Why it's wrong here
EKM uses keys from an external key manager; rotation is managed externally, not via KMS automatic rotation.
✓
Customer-Managed Encryption Key (CMEK) using Cloud KMS
Why this is correct
CMEK allows customers to set a rotation period (e.g., 30 days) and KMS handles automatic rotation.
Related concept
Read the scenario before looking for a memorised answer.
✗
Google-managed encryption keys
Why it's wrong here
Google manages the keys and rotation schedule is not visible or controllable by the customer.
✗
Customer-Supplied Encryption Key (CSEK)
Why it's wrong here
CSEK keys are provided by the customer and must be rotated manually.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CMEK (which supports automated rotation) with CSEK (which requires manual key management and does not support rotation), leading them to choose D thinking they have more control, but CSEK lacks the automated rotation feature needed for this requirement.
Detailed technical explanation
How to think about this question
Cloud KMS uses a key hierarchy where a key ring contains one or more cryptographic keys, each with a rotation period defined in seconds (e.g., 2592000 for 30 days). When a key is rotated, Cloud KMS automatically creates a new key version, and the old version is retained for decryption of existing data. This ensures that new data is encrypted with the latest key version while old data remains accessible, a critical behavior for compliance with data retention policies.
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.
Supporting compliance requirements — This question tests Supporting compliance requirements — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Customer-Managed Encryption Key (CMEK) using Cloud KMS — Option B is correct because Customer-Managed Encryption Keys (CMEK) with Cloud KMS allow you to control and rotate encryption keys on a schedule. Cloud KMS supports automatic key rotation with a configurable rotation period (e.g., every 30 days), meeting the requirement without manual intervention.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.