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.

• ✗

  Delete the VM and recreate it from the image.

  Why it's wrong here

  Deleting the VM and recreating it from the image is overly destructive and does not directly solve the specific capacity error you are encountering. During recreation, you would specify the new size, and Azure would place it on suitable hardware, but the simpler deallocation-and-resize approach achieves the same result without losing the VM's current configuration, customizations, and any in-place data. Recreating from image also risks data loss if not properly backed up, and it is a last resort best avoided when a straightforward deallocation is available.

  When this WOULD be correct

  If the VM's operating system or configuration is corrupted beyond repair, or if you need to migrate to a different VM series that requires a new image (e.g., moving from a generation 1 to generation 2 VM), deleting and recreating from an image would be appropriate.

• ✓

  Deallocate the VM, then retry the resize.

  Why this is correct

  Deallocating the VM releases it from its current host cluster, which is the standard Azure fix for a resize failure caused by insufficient capacity on the existing hardware. Once deallocated, Azure can place the VM on a different cluster that supports the target VM size, so you can then retry the resize operation successfully. This preserves all disks, networking, and configuration, making it the least disruptive correct action.

• ✗

  Attach a new data disk first.

  Why it's wrong here

  Attaching a new data disk is a storage operation that adds a managed disk to the VM; it has no effect on the VM's compute allocation or its current host placement. The error message indicates the target VM size is not available on the existing host, which depends purely on the hardware's CPU and memory capacity, not on the number or size of disks. Therefore, adding a disk will not make the target size become available and is an unnecessary action that consumes time but does not resolve the root cause.

  When this WOULD be correct

  When the question asks how to increase storage capacity for an existing VM without downtime, attaching a new data disk is the correct answer.

• ✗

  Create an availability set for the VM.

  Why it's wrong here

  An availability set is a logical grouping for high availability, placing VMs across fault and update domains to protect against hardware failures, not to alter compute capacity. Creating or adding the VM to an availability set does not influence which host clusters can accommodate a larger VM size, so it will not resolve the resize error. Moreover, adding a VM to an availability set typically requires the VM to be recreated anyway, which is even more disruptive without addressing the underlying capacity issue.

  When this WOULD be correct

  This option would be correct if the question asked: 'You need to ensure that two VMs are in separate fault domains and update domains for high availability. What should you do?'

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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