CompTIA
220-802 · Question #917
220-802 Question #917: Real Exam Question with Answer & Explanation
The correct answer is A: Decreased performance. Virtual machines share the physical host's CPU, RAM, and storage through a hypervisor layer, which introduces overhead and results in decreased performance compared to running natively.
Question
Which of the following is a disadvantage of running a virtual machine?
Options
- ADecreased performance
- BLong recovery time
- CHard drive compatibility
- DDifficult software testing
Explanation
Virtual machines share the physical host's CPU, RAM, and storage through a hypervisor layer, which introduces overhead and results in decreased performance compared to running natively.
Common mistakes.
- B. Virtual machines actually enable faster recovery through snapshots and checkpoints, making long recovery time an advantage of competitors rather than a VM disadvantage.
- C. Hard drive compatibility is not a significant disadvantage of VMs - virtual disk formats abstract the underlying hardware, improving compatibility.
- D. Software testing is significantly easier in a VM because environments can be snapshotted, cloned, and reset rapidly, making this an advantage rather than a disadvantage.
Concept tested. Disadvantages of virtual machine performance overhead
Reference. https://learn.microsoft.com/en-us/windows-server/virtualization/hyper-v/hyper-v-technology-overview
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