The correct answer is to enable automatic rotation with a rotation period set to 90 days. This satisfies PCI DSS requirement 3.5.1, which mandates that cryptographic keys must be rotated at least every 90 days to limit the exposure window if a key is compromised. On the Google Professional Cloud Security Engineer exam, this question tests your understanding of how Cloud KMS automates compliance controls—specifically, that manual rotation introduces human error risk, while automatic rotation enforces the policy consistently. A common trap is selecting “manual rotation every 90 days” or “key deletion after 90 days,” but the exam emphasizes automation as the secure, auditable method. Remember the mnemonic: “90 days, no delays—let automation earn the praise.”
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.
For PCI DSS compliance, which of the following is required for Cloud KMS keys?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable automatic rotation with a rotation period set to 90 days
PCI DSS requirement 3.5.1 mandates that cryptographic keys must be rotated at least every 90 days to limit the impact of a potential key compromise. For Cloud KMS, enabling automatic rotation with a rotation period of 90 days ensures compliance by automating the key rotation process without manual intervention, reducing the risk of human error.
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.
✓
Enable automatic rotation with a rotation period set to 90 days
Why this is correct
Automatic rotation with a defined period satisfies PCI DSS key rotation requirements.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a separate key per service account
Why it's wrong here
While logical separation is good, it is not a specific PCI DSS requirement for key management.
✗
Disable key rotation after initial use
Why it's wrong here
Disabling rotation violates key management best practices and compliance requirements for periodic rotation.
✗
Key rotation every 30 days
Why it's wrong here
PCI DSS does not specify 30 days; 90 days is typical, but the statement is too specific and might not be required by all assessments.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the exact PCI DSS requirement of 90-day rotation, and candidates may mistakenly choose 30 days (option D) thinking more frequent rotation is better, but the question asks for what is 'required', not what is 'allowed'.
Detailed technical explanation
How to think about this question
Cloud KMS uses a key's 'nextRotationTime' and 'rotationPeriod' fields to schedule automatic rotation; when a key is rotated, a new key version is created with a new cryptographic material, but the old key version remains active for decryption of data encrypted under it. In a real-world scenario, if a key is rotated every 30 days instead of 90, it increases operational overhead and may cause issues with data that needs to be decrypted with older key versions, but PCI DSS only mandates a maximum of 90 days, so 30 days is compliant but not the required interval.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: Enable automatic rotation with a rotation period set to 90 days — PCI DSS requirement 3.5.1 mandates that cryptographic keys must be rotated at least every 90 days to limit the impact of a potential key compromise. For Cloud KMS, enabling automatic rotation with a rotation period of 90 days ensures compliance by automating the key rotation process without manual intervention, reducing the risk of human error.
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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