220-802 · Question #656
Revert to snapshot is a feature of:
The correct answer is B. The hypervisor. The snapshot and revert-to-snapshot feature is managed entirely by the hypervisor, which captures and restores the complete state of a virtual machine independent of the guest or host OS.
Question
Revert to snapshot is a feature of:
Options
- AThe host OS.
- BThe hypervisor.
- CThe underlying storage.
- DThe guest OS.
How the community answered
(45 responses)- A2% (1)
- B91% (41)
- C2% (1)
- D4% (2)
Why each option
The snapshot and revert-to-snapshot feature is managed entirely by the hypervisor, which captures and restores the complete state of a virtual machine independent of the guest or host OS.
The host OS manages physical hardware resources and scheduling but does not have visibility into individual VM states or the ability to revert them.
The hypervisor controls the state of virtual machine memory, disk, and configuration at the hardware abstraction layer, which is what makes snapshot creation and restoration possible. When you revert to a snapshot, the hypervisor rolls back the VM to the exact saved state without involvement from the guest OS. Products like VMware vSphere and Hyper-V implement this feature at the hypervisor level.
Underlying storage holds the snapshot data files on disk, but the logic to create, manage, and revert snapshots resides in the hypervisor, not the storage subsystem itself.
The guest OS runs inside the VM and has no awareness of or control over the snapshot mechanism managed by the hypervisor below it.
Concept tested: Hypervisor snapshot and revert functionality
Source: https://learn.microsoft.com/en-us/windows-server/virtualization/hyper-v/manage/enable-or-disable-checkpoints-in-hyper-v
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