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220-1201 Practice Question: That their virtual machine is running very slowly
A user reports that their virtual machine is running very slowly. The host system has 16 GB of RAM, and the VM is configured with 8 GB. The host is running a Type 2 hypervisor on Windows 10. The technician checks Task Manager and sees that the host is using 14 GB of RAM. What is the most likely cause of the VM's poor performance?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The host does not have enough free RAM to support the VM's needs
The host is running low on available RAM because the VM's allocated memory is not being released efficiently, or other host processes are consuming memory. In a Type 2 hypervisor, the host OS manages memory, and if it is oversubscribed, the VM will experience swapping and slowdowns.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The VM's virtual CPU is overclocked
Why it's wrong here
Virtual CPUs (vCPUs) are logical representations managed by the hypervisor, not physical hardware that can be directly overclocked by a user within the VM. While a hypervisor could theoretically allocate more host CPU cycles, "overclocking" a vCPU in the traditional sense is not a configurable or typical scenario, and it wouldn't directly cause a VM to run slowly due to RAM issues; rather, it would be an attempt to speed it up.
- ✗
The hypervisor is not compatible with Windows 10
Why it's wrong here
If the hypervisor were truly incompatible with Windows 10, the virtual machine would likely fail to install the operating system or even start up at all, rather than merely running slowly. Modern hypervisors from major vendors universally support Windows 10 as a guest OS, making a fundamental compatibility issue an unlikely cause for a VM that is currently running, albeit with performance issues.
- ✓
The host does not have enough free RAM to support the VM's needs
Why this is correct
When the host system lacks sufficient physical RAM to allocate to a running virtual machine, the hypervisor is forced to swap portions of the VM's memory to the host's hard drive (paging or swapping). This process, known as disk I/O for virtual memory, is significantly slower than accessing physical RAM, leading to severe performance degradation and a "running slowly" symptom for the VM.
- ✗
The VM's network adapter is set to NAT instead of bridged
Why it's wrong here
The network adapter mode, whether NAT (Network Address Translation) or bridged, primarily impacts how the VM communicates with the external network and other devices. While a misconfigured or inefficient network mode could affect network-dependent application performance, it does not directly cause the overall virtual machine operating system to run slowly due to fundamental resource starvation, especially concerning RAM.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.