This AZ-305 practice question tests your understanding of design data storage solutions. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 store sensitive customer data in Azure Blob Storage with encryption at rest using customer-managed keys (CMK) stored in a hardware security module (HSM). Which Azure service should they use to manage the keys?
Azure Key Vault (Premium tier)
Why wrong: Premium tier uses HSMs but the service is called Managed HSM.
Azure Information Protection
Why wrong: Azure Information Protection is for classification and labeling.
Azure Key Vault (Standard tier)
Why wrong: Standard tier uses software-backed keys, not HSM.
Azure Key Vault Managed HSM
Managed HSM provides HSM-backed keys for CMK.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure Key Vault Managed HSM
Azure Key Vault Managed HSM is a fully managed, highly available, single-tenant HSM that is FIPS 140-2 Level 3 validated. It allows you to store customer-managed encryption keys (CMKs) in a hardware security module (HSM) for Azure Storage encryption at rest, meeting the requirement for HSM-backed key storage. The Premium tier of Azure Key Vault also supports HSM-backed keys, but the question specifies 'stored in a hardware security module (HSM)', and Managed HSM provides dedicated HSM partitions with stronger isolation and compliance.
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.
Azure Key Vault (Premium tier)
Why it's wrong here
Premium tier uses HSMs but the service is called Managed HSM.
Azure Information Protection
Why it's wrong here
Azure Information Protection is for classification and labeling.
Azure Key Vault (Standard tier)
Why it's wrong here
Standard tier uses software-backed keys, not HSM.
Azure Key Vault Managed HSM
Why this is correct
Managed HSM provides HSM-backed keys for CMK.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the Azure Key Vault Premium tier (which supports HSM keys but in a shared multi-tenant HSM) with the dedicated HSM requirement, leading them to select Option A instead of the more appropriate Managed HSM.
Detailed technical explanation
Azure Key Vault Managed HSM uses a multi-tenant HSM backend but provides each customer with an isolated HSM partition (a 'managed HSM pool') that is FIPS 140-2 Level 3 validated. Under the hood, it leverages Azure's dedicated HSM infrastructure, and keys never leave the HSM boundary in plaintext. A real-world scenario where this matters is for organizations subject to regulatory standards like PCI-DSS or GDPR that require dedicated HSM-level key isolation and audit logging, where Managed HSM's per-tenant security boundaries and full control over key lifecycle (including export) are critical.
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
Design data storage solutions — This question tests Design data storage solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Azure Key Vault Managed HSM — Azure Key Vault Managed HSM is a fully managed, highly available, single-tenant HSM that is FIPS 140-2 Level 3 validated. It allows you to store customer-managed encryption keys (CMKs) in a hardware security module (HSM) for Azure Storage encryption at rest, meeting the requirement for HSM-backed key storage. The Premium tier of Azure Key Vault also supports HSM-backed keys, but the question specifies 'stored in a hardware security module (HSM)', and Managed HSM provides dedicated HSM partitions with stronger isolation and compliance.
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 24, 2026
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