- A
CPU Pinning
CPU pinning dedicates physical cores to specific VMs, enforcing resource isolation.
- B
IOMMU (Input-Output Memory Management Unit)
IOMMU isolates device DMA access to assigned VMs.
- C
Hypervisor Introspection
Why wrong: Introspection monitors VMs but does not provide hardware-level isolation.
- D
Security Groups
Why wrong: Security Groups are network-level firewalls, not hardware isolation.
- E
Network ACLs
Why wrong: NACLs are subnet-level firewalls, not hardware isolation.
Question 345 of 1,000
hardMultiple SelectObjective-mapped
CCSP Practice Question: A security auditor is reviewing a cloud…
This CCSP practice question tests your understanding of a security auditor is reviewing a cloud…. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A security auditor is reviewing a cloud provider's virtualisation infrastructure. Which TWO mechanisms ensure VM isolation at the hardware level to prevent one tenant from accessing another's resources?
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
✓
CPU Pinning
CPU Pinning (option A) ensures VM isolation at the hardware level by dedicating specific physical CPU cores exclusively to a particular VM. This prevents other VMs from scheduling on those cores, eliminating CPU-level side-channel attacks and resource contention. It is a hardware-enforced isolation mechanism because the hypervisor uses the CPU's hardware virtualization extensions (e.g., Intel VT-x or AMD-V) to enforce the pinning, ensuring that one tenant's VM cannot access another's CPU resources.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
CPU Pinning
Why this is correct
CPU pinning dedicates physical cores to specific VMs, enforcing resource isolation.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
IOMMU (Input-Output Memory Management Unit)
Why this is correct
IOMMU isolates device DMA access to assigned VMs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Hypervisor Introspection
Why it's wrong here
Introspection monitors VMs but does not provide hardware-level isolation.
- ✗
Security Groups
Why it's wrong here
Security Groups are network-level firewalls, not hardware isolation.
- ✗
Network ACLs
Why it's wrong here
NACLs are subnet-level firewalls, not hardware isolation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between software-based isolation controls (like Security Groups and Network ACLs) and hardware-enforced mechanisms (like CPU Pinning and IOMMU), trapping candidates who confuse network-layer security with hardware-level resource isolation.
Detailed technical explanation
How to think about this question
The IOMMU (Input-Output Memory Management Unit) works by remapping DMA (Direct Memory Access) requests from devices to physical memory, ensuring that a VM's assigned devices can only access memory pages allocated to that VM. This prevents a malicious or misconfigured VM from using a PCIe device (e.g., GPU, NVMe SSD) to read or write another tenant's memory. In a real-world scenario, without IOMMU, a VM with a passed-through GPU could perform a DMA attack to access the hypervisor's memory or other VMs' data, making IOMMU critical for hardware-level isolation in virtualized environments.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this CCSP question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: CPU Pinning — CPU Pinning (option A) ensures VM isolation at the hardware level by dedicating specific physical CPU cores exclusively to a particular VM. This prevents other VMs from scheduling on those cores, eliminating CPU-level side-channel attacks and resource contention. It is a hardware-enforced isolation mechanism because the hypervisor uses the CPU's hardware virtualization extensions (e.g., Intel VT-x or AMD-V) to enforce the pinning, ensuring that one tenant's VM cannot access another's CPU resources.
What should I do if I get this CCSP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.
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