- A
Default encryption at rest with Google-managed keys
By default, Cloud SQL encrypts data at rest using Google-managed encryption keys.
- B
Cloud HSM hardware security module for encryption
Why wrong: Cloud HSM is used to store and manage encryption keys, but it is not a direct encryption method for Cloud SQL. CMEK can use keys from Cloud HSM, but the method is still CMEK.
- C
Cloud Key Management Service (Cloud KMS) as a standalone encryption method
Why wrong: Cloud KMS is a key management service, not an encryption method. It is used as part of CMEK.
- D
Client-side encryption before storing data in Cloud SQL
Why wrong: Client-side encryption is performed by the application, not a built-in Cloud SQL feature.
- E
Customer-managed encryption keys (CMEK) using Cloud KMS
Cloud SQL supports CMEK, allowing customers to manage their own encryption keys via Cloud KMS.
Quick Answer
The answer is that Cloud SQL supports both Google-managed encryption keys and customer-managed encryption keys (CMEK) using Cloud KMS for encryption at rest. This is correct because Cloud SQL automatically encrypts all data on disk using AES-256 with keys that Google generates and rotates, providing a transparent, default layer of protection. For organizations requiring greater control, CMEK allows you to create, rotate, and manage your own encryption keys via Cloud KMS, integrating with Cloud Key Management Service for auditability and compliance. On the Google Professional Cloud Security Engineer exam, this question tests your understanding of the shared responsibility model for data protection, often appearing as a multiple-select item where a common trap is assuming only one method is supported. Remember that Cloud SQL always uses Google-managed keys by default, but you can optionally enable CMEK for additional governance. A helpful memory tip is "Default Google, optional You" — default encryption uses Google’s keys, but you can choose to bring your own via CMEK.
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 encrypt data at rest in Cloud SQL. Which TWO methods are supported? (Choose TWO.)
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
Default encryption at rest with Google-managed keys
Option A is correct because Cloud SQL provides default encryption at rest using AES-256 with Google-managed keys, which are automatically generated and rotated by Google. This encryption is transparent to the user and requires no additional configuration, ensuring data is encrypted before being written to disk.
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.
- ✓
Default encryption at rest with Google-managed keys
Why this is correct
By default, Cloud SQL encrypts data at rest using Google-managed encryption keys.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud HSM hardware security module for encryption
Why it's wrong here
Cloud HSM is used to store and manage encryption keys, but it is not a direct encryption method for Cloud SQL. CMEK can use keys from Cloud HSM, but the method is still CMEK.
- ✗
Cloud Key Management Service (Cloud KMS) as a standalone encryption method
Why it's wrong here
Cloud KMS is a key management service, not an encryption method. It is used as part of CMEK.
- ✗
Client-side encryption before storing data in Cloud SQL
Why it's wrong here
Client-side encryption is performed by the application, not a built-in Cloud SQL feature.
- ✓
Customer-managed encryption keys (CMEK) using Cloud KMS
Why this is correct
Cloud SQL supports CMEK, allowing customers to manage their own encryption keys via Cloud KMS.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between default encryption (Google-managed keys) and customer-managed encryption keys (CMEK) as the two supported methods, trapping candidates who think Cloud HSM or client-side encryption are built-in Cloud SQL features.
Detailed technical explanation
How to think about this question
Cloud SQL uses AES-256 encryption at rest by default, with keys managed by Google's key management infrastructure. When customer-managed encryption keys (CMEK) are enabled, Cloud SQL integrates with Cloud KMS to wrap the data encryption keys (DEKs) with a customer-managed key encryption key (KEK), allowing customers to control key rotation and access. In a real-world scenario, organizations with compliance requirements like PCI DSS or HIPAA may opt for CMEK to meet key management auditability, while default encryption suffices for general use.
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.
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Ensuring data protection — study guide chapter
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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: Default encryption at rest with Google-managed keys — Option A is correct because Cloud SQL provides default encryption at rest using AES-256 with Google-managed keys, which are automatically generated and rotated by Google. This encryption is transparent to the user and requires no additional configuration, ensuring data is encrypted before being written to disk.
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: Jun 30, 2026
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.
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