Quick Answer
The answer is Cloud External Key Manager. This service is the correct choice because it enables you to use an external key management system, such as one running on-premises, to control the encryption keys for Cloud Storage logs, ensuring those keys never reside within Google’s infrastructure. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of data sovereignty and key separation—a common trap is confusing Cloud KMS (where Google holds the key) with Cloud EKM (where you hold the key). The exam often presents a requirement like “keys must be managed outside of Google Cloud” to steer you toward Cloud EKM over CMEK or CSEK. A useful memory tip: think “EKM = External Key, Managed by Me”—if the question emphasizes on-premises control, your answer is always Cloud External Key Manager.
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.
Which method ensures that Cloud Storage logs are encrypted with a key that is managed on-premises?
CMEK
Why wrong: CMEK uses keys stored in Cloud KMS, not on-premises.
Cloud External Key Manager
Cloud External Key Manager uses an external key management partner, keeping keys on-premises.
CSEK
Why wrong: CSEK is deprecated and not recommended for new workloads.
Default encryption
Why wrong: Default encryption uses Google-managed keys.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cloud External Key Manager
Cloud External Key Manager (Cloud EKM) allows you to use an external key management system, such as one running on-premises, to manage encryption keys for Cloud Storage. This ensures that the keys used to encrypt your data are never stored in Google Cloud, meeting the requirement of on-premises key management.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
CMEK
Why it's wrong here
CMEK uses keys stored in Cloud KMS, not on-premises.
Cloud External Key Manager
Why this is correct
Cloud External Key Manager uses an external key management partner, keeping keys on-premises.
Related concept
Read the scenario before looking for a memorised answer.
CSEK
Why it's wrong here
CSEK is deprecated and not recommended for new workloads.
Default encryption
Why it's wrong here
Default encryption uses Google-managed keys.
Common exam traps
Google Cloud often tests the distinction between where the key material is stored (Google Cloud vs. on-premises) rather than who manages the key lifecycle, causing candidates to confuse CMEK (customer-managed but cloud-hosted) with Cloud EKM (customer-managed and on-premises-hosted).
Detailed technical explanation
Cloud EKM integrates with external key management partners (e.g., Fortanix, Thales) via the Cloud External Key Manager API, which uses the Google Cloud KMS key format but delegates cryptographic operations to the external service. The external KMS must be reachable over a private, authorized connection (e.g., VPC Service Controls or Private Service Connect), and the key material never leaves the on-premises environment. This is critical for regulatory compliance where key sovereignty is mandated, such as in GDPR or PCI DSS scenarios.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Supporting compliance requirements — This question tests Supporting compliance requirements — Read the scenario before looking for a memorised answer..
The correct answer is: Cloud External Key Manager — Cloud External Key Manager (Cloud EKM) allows you to use an external key management system, such as one running on-premises, to manage encryption keys for Cloud Storage. This ensures that the keys used to encrypt your data are never stored in Google Cloud, meeting the requirement of on-premises key management.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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