AZ-104 Deploy and Manage Azure Compute Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  Create a managed disk from the snapshot.

  Why this is correct

  In Azure, a snapshot is a point-in-time read-only copy of a managed disk and cannot be attached directly to a VM. You must first create a new managed disk using the snapshot as its source (for example, with New-AzDisk specifying the snapshot ID or via the portal's 'Create disk from snapshot' action), selecting the required storage SKU, size, and zone. This produces a writable, independently managed disk that can then be attached for recovery.

• ✓

  Attach the restored managed disk to VM-Data01.

  Why this is correct

  After the managed disk has been created from the snapshot, it must be attached as a data disk to VM-Data01, specifying a LUN and cache setting. If the original corrupted disk is still attached, detach it before attaching the restored disk to avoid LUN conflicts and duplicate disk identifiers. Because this operation targets only the data disk, the OS disk remains intact and the VM boots normally, preserving the system environment while restoring the affected volume.

• ✗

  Redeploy the VM and expect the data disk to revert automatically.

  Why it's wrong here

  The 'Redeploy' action in Azure is a platform-level operation that migrates the VM to a different host node while keeping the same disks, NICs, and settings. It is designed to resolve host hardware or networking faults, not to roll back data corruption on a managed disk. The contents of the data disk are unchanged, so redeploying the VM provides no restoration of the corrupted data from a snapshot.

  When this WOULD be correct

  This option would be correct if the question asked how to resolve a VM connectivity issue or a host-level problem (e.g., VM stuck in a failed state) without changing disk data. In that case, redeploying the VM can fix the issue by moving it to a new host.

• ✗

  Generalize the VM and redeploy it from the snapshot.

  Why it's wrong here

  Generalizing a VM with Sysprep (Windows) or waagent -deprovision (Linux) prepares the OS as a reusable image template and strips machine-specific identifiers, which is intended for creating new VM images, not for restoring a single data disk. It would invalidate the original VM's identity, disrupt its operation, and still require the snapshot to be converted into a managed disk before any restore could occur. This approach adds unnecessary complexity and fails to isolate the corrupted data volume.

  When this WOULD be correct

  This option would be correct in a scenario where you need to create a new VM from a snapshot of the OS disk (e.g., after a critical OS corruption) and you want to reuse the same VM name or deploy a standardized image. The question would specify 'OS disk snapshot' and 'create a new VM'.

• ✗

  Replace the snapshot with the current data disk to roll back the VM.

  Why it's wrong here

  A snapshot is an immutable point-in-time copy, and the current live data disk cannot be used to overwrite or 'replace' that snapshot. The restore direction is always from snapshot to a newly created managed disk; there is no Azure operation that writes live disk blocks back into a snapshot. Attempting this would not produce a recovered disk and would violate the snapshot's purpose as a clean backup reference.

  When this WOULD be correct

  If the question asked to update a snapshot to reflect the current state of a data disk (e.g., after applying a patch that you want to capture for future rollbacks), then replacing the snapshot with the current disk would be correct.

Option-by-option analysis

Why each answer is right or wrong

Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.

Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”

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