FC0-U71 Infrastructure Practice Question
A company is virtualizing several physical servers onto one host. The administrator wants to isolate each virtual machine so that a crash or resource spike in one does not affect the others, while still sharing the physical CPU and memory. Which technology should the administrator rely on?
⚠ Common exam trap
The trap here is assuming that any infrastructure component involved in a virtualized environment, such as a switch or RAID controller, is what enables the virtual machines themselves.
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
✓
A hypervisor
Virtual machines share a host's CPU and memory through a hypervisor, which enforces isolation so one VM's crash or resource spike does not disrupt the others. RAID, switches, and load balancers serve storage, networking, and traffic distribution roles respectively, but none of them virtualizes compute resources.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A load balancer
Why it's wrong here
A load balancer distributes incoming network requests across multiple servers to improve responsiveness and availability. It does not create or isolate virtual machines on a single host. The scenario requires compute virtualization, not traffic distribution, so this component is not the right fit.
- ✓
A hypervisor
Why this is correct
A hypervisor creates and manages virtual machines, allocating physical CPU, memory, and storage to each guest while keeping them isolated from one another. It is the core technology that allows multiple VMs to share one host safely. This directly meets the requirement to isolate workloads on shared hardware.
- ✗
A RAID controller
Why it's wrong here
A RAID controller manages disk redundancy and performance across physical drives. It does not create virtual machines or isolate their CPU and memory usage. While RAID may be used in a virtualization host for storage resilience, it is not the technology that separates VM workloads.
- ✗
A network switch
Why it's wrong here
A switch forwards network traffic between devices and can support VLANs for network segmentation, but it does not virtualize servers or isolate their compute resources. The administrator's concern is CPU and memory sharing among VMs, which a switch cannot address. It plays a supporting role at most.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This FC0-U71 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 FC0-U71 exam.