Which of the following descriptions about virtual machine snapshots is wrong?

Question

Options

• AWhen the source file system is not modified, the virtual machine snapshot does not occupy
• BVirtual machine snapshot data is independent and can be used by multiple applications
• CThe virtual machine snapshot is the image of the virtual machine at a certain time
• DThe virtual machine snapshot occupies a small space, and the size has nothing to do with the size

• A
  3% (2)
• B
  75% (51)
• C
  7% (5)
• D
  15% (10)

Explanation

Option B is the wrong description because VM snapshot data is not independent - snapshots use a copy-on-write (COW) mechanism that creates a delta file recording only changes from the base disk. This delta file is tightly coupled to its parent VM and cannot be detached and freely shared or reused by multiple applications.

Why the other options are correct (and therefore not the answer):

• A is accurate: COW snapshots record only changes, so if the source remains unmodified, the snapshot delta file grows very little or not at all.
• C is accurate: a snapshot is literally a point-in-time capture of a VM's disk state, memory, and settings.
• D is accurate: a fresh snapshot is small regardless of how large the source disk is, since it starts as an empty delta and only grows as writes occur.

Memory tip: Think of a VM snapshot like a "track changes" document - it only records differences, not a full independent copy, which is exactly why it can't stand alone or be shared freely. If B said "incremental" or "dependent," it would be true; "independent" is the red flag.

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