Microsoft Azure Security Engineer Associate AZ-500 Practice Question
Your Windows and Linux VMs run in multiple availability zones. A regulation requires that OS, data, and temporary disks be encrypted at rest with customer-managed keys (CMKs) stored in Azure Key Vault. Additional constraints: no in-guest agent is allowed and the disk host cache must also be encrypted. Which Azure capability meets these requirements?
Confidential disk encryption for confidential VMs
Azure Disk Encryption with customer-managed keys
Encryption at host enabled through a disk encryption set that uses customer-managed keys
Default server-side encryption with platform-managed keys
Encryption at host performs encryption on the Azure compute host before any data is written to the storage service. When a disk encryption set that references a Key Vault key is associated with the VM's managed disks, the CMK is used transparently by the host. Because encryption happens outside the guest OS, no agent is required, and the protection extends to OS, data, temporary disks, and their caches.
Azure Disk Encryption relies on BitLocker or DM-Crypt inside the guest, so it needs an agent and does not encrypt the temp disk or host cache. Server-side encryption with platform-managed keys does not satisfy the CMK requirement. Confidential disk encryption applies only to specific confidential VM series and is unnecessary here.
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Microsoft Azure Security Engineer Associate AZ-500
Secure compute, storage, and databases
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