VCP-VVF Vmware Vsphere Foundation Fundamentals Practice Question
An administrator is troubleshooting a memory-constrained vSphere cluster. A virtual machine with a configured memory size of 32 GB has a balloon driver (vmmemctl) that is actively reclaiming 8 GB of guest memory. Which underlying condition explains why the memory balloon driver is active?
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 ESXi host memory usage has crossed the active reclamation threshold, requiring memory reclamation.
Ballooning activates when host-level memory consumption exceeds the target free threshold, prompting the ESXi hypervisor to reclaim memory from VMs.
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 guest operating system has experienced a hardware memory error on the physical DIMM.
Why it's wrong here
Hardware errors trigger machine check exceptions, not ballooning.
- ✗
The virtual machine has exceeded its configured memory reservation limit.
Why it's wrong here
Reservations guarantee minimum allocation, not ballooning triggers.
- ✗
The virtual machine has a memory limit set lower than its active working set.
Why it's wrong here
A memory limit restricts maximum allocation, but ballooning is driven by host pressure.
- ✓
The ESXi host memory usage has crossed the active reclamation threshold, requiring memory reclamation.
Why this is correct
Host-level memory pressure forces ESXi to use ballooning to reclaim guest OS memory.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official VMware exam blueprint
This VCP-VVF practice question is part of Courseiva's free VMware 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 VCP-VVF exam.