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CAS-004 Practice Question: A virtualization administrator needs to ensure…

A virtualization administrator needs to ensure that virtual machines (VMs) from different customers cannot communicate with each other unless explicitly allowed. Which network security control should be implemented on the hypervisor?

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

✓

Use a virtual firewall to create per-VM security groups

Micro-segmentation (e.g., NSX) allows fine-grained control over VM-to-VM traffic at the virtual switch level.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Patch the hypervisor regularly

    Why it's wrong here

    Patching addresses vulnerabilities but does not enforce isolation.

  • ✗

    Assign each VM to a different physical server

    Why it's wrong here

    This is inefficient and still requires network controls to prevent communication.

  • ✓

    Use a virtual firewall to create per-VM security groups

    Why this is correct

    Virtual firewalls can apply policies to individual VMs, isolating them.

  • ✗

    Enable hypervisor memory overcommitment

    Why it's wrong here

    Memory overcommitment does not affect network isolation.

About these practice questions

One of 968 original CAS-005 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This CAS-005 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 CAS-005 exam.