- A
Kata Containers run containers in lightweight VMs, providing hardware-level isolation.
Correct. Kata Containers run each container or pod in a lightweight VM with its own guest kernel, providing hardware-level isolation via KVM or similar.
- B
gVisor provides a kernel-level sandbox by implementing a user-space kernel.
Correct. gVisor implements a user-space kernel that intercepts system calls, providing a kernel-level sandbox without dedicated VMs.
- C
Kata Containers use the host kernel for system calls.
Why wrong: Incorrect. Kata Containers do not use the host kernel; they use their own guest kernel within a lightweight VM.
- D
gVisor runs containers in separate VMs for each pod.
Why wrong: Incorrect. gVisor does not run containers in separate VMs; it runs as a kernel in user space, intercepting system calls.
- E
Both gVisor and Kata Containers require RuntimeClass to be used in Kubernetes.
Why wrong: Incorrect. Although RuntimeClass is often used to select non-default runtimes in Kubernetes, it is not a strict requirement for using gVisor or Kata Containers; therefore, the claim that both 'require' RuntimeClass is false.
Container Sandboxing with Kata Containers and gVisor
This CKS practice question tests your understanding of minimize microservice vulnerabilities. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO of the following are correct about container sandboxing technologies? (Select TWO)
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
Kata Containers run containers in lightweight VMs, providing hardware-level isolation.
Option A is correct because Kata Containers provide hardware-level isolation by running each container or pod in a lightweight VM with its own guest kernel using KVM. Option B is correct because gVisor implements a user-space kernel (called Sentry) that intercepts system calls, providing a kernel-level sandbox without dedicated VMs. Option C is incorrect because Kata Containers use a guest kernel, not the host kernel. Option D is incorrect because gVisor does not run containers in separate VMs; it runs as a kernel within the user space. Option E is incorrect because although RuntimeClass is commonly used to select non-default runtimes in Kubernetes, the statement is not universally required; it is a mechanism but not a strict requirement for using these technologies, making the claim that both 'require' RuntimeClass too absolute and thus false.
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.
- ✓
Kata Containers run containers in lightweight VMs, providing hardware-level isolation.
Why this is correct
Correct. Kata Containers run each container or pod in a lightweight VM with its own guest kernel, providing hardware-level isolation via KVM or similar.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
gVisor provides a kernel-level sandbox by implementing a user-space kernel.
Why this is correct
Correct. gVisor implements a user-space kernel that intercepts system calls, providing a kernel-level sandbox without dedicated VMs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Kata Containers use the host kernel for system calls.
Why it's wrong here
Incorrect. Kata Containers do not use the host kernel; they use their own guest kernel within a lightweight VM.
- ✗
gVisor runs containers in separate VMs for each pod.
Why it's wrong here
Incorrect. gVisor does not run containers in separate VMs; it runs as a kernel in user space, intercepting system calls.
- ✗
Both gVisor and Kata Containers require RuntimeClass to be used in Kubernetes.
Why it's wrong here
Incorrect. Although RuntimeClass is often used to select non-default runtimes in Kubernetes, it is not a strict requirement for using gVisor or Kata Containers; therefore, the claim that both 'require' RuntimeClass is false.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may be misled by the appealing combination of A, B, and E, but only A and B are correct. The statement in E is too absolute because RuntimeClass is not strictly required—it is an optional mechanism.
Detailed technical explanation
How to think about this question
Kata Containers leverage hardware virtualization extensions (Intel VT-x or AMD-V) to boot a minimal Linux kernel inside a VM, with each container sharing that VM's kernel, providing strong isolation at the cost of higher overhead compared to traditional containers. gVisor's Sentry intercepts system calls using a ptrace-based or KVM-based platform, translating them into host system calls with reduced attack surface, but it does not provide full kernel-level isolation like a VM. In real-world scenarios, Kata Containers are preferred for multi-tenant environments requiring strong security boundaries, while gVisor is chosen for lighter-weight sandboxing with lower latency.
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 practitioner preparing for the CKS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
- →
Minimize Microservice Vulnerabilities — study guide chapter
Learn the concepts, then practise the questions
- →
Minimize Microservice Vulnerabilities practice questions
Targeted practice on this topic area only
- →
All CKS questions
997 questions across all exam domains
- →
Certified Kubernetes Security Specialist CKS study guide
Full concept coverage aligned to exam objectives
- →
CKS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CKS practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Monitoring Logging and Runtime Security practice questions
Practise CKS questions linked to Monitoring Logging and Runtime Security.
Cluster Setup and Hardening practice questions
Practise CKS questions linked to Cluster Setup and Hardening.
System Hardening practice questions
Practise CKS questions linked to System Hardening.
Minimize Microservice Vulnerabilities practice questions
Practise CKS questions linked to Minimize Microservice Vulnerabilities.
Supply Chain Security practice questions
Practise CKS questions linked to Supply Chain Security.
Monitoring, Logging and Runtime Security practice questions
Practise CKS questions linked to Monitoring, Logging and Runtime Security.
Cluster Setup practice questions
Practise CKS questions linked to Cluster Setup.
Cluster Hardening practice questions
Practise CKS questions linked to Cluster Hardening.
CKS fundamentals practice questions
Practise CKS questions linked to CKS fundamentals.
CKS scenario practice questions
Practise CKS questions linked to CKS scenario.
CKS troubleshooting practice questions
Practise CKS questions linked to CKS troubleshooting.
Practice this exam
Start a free CKS practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this CKS question test?
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Kata Containers run containers in lightweight VMs, providing hardware-level isolation. — Option A is correct because Kata Containers provide hardware-level isolation by running each container or pod in a lightweight VM with its own guest kernel using KVM. Option B is correct because gVisor implements a user-space kernel (called Sentry) that intercepts system calls, providing a kernel-level sandbox without dedicated VMs. Option C is incorrect because Kata Containers use a guest kernel, not the host kernel. Option D is incorrect because gVisor does not run containers in separate VMs; it runs as a kernel within the user space. Option E is incorrect because although RuntimeClass is commonly used to select non-default runtimes in Kubernetes, the statement is not universally required; it is a mechanism but not a strict requirement for using these technologies, making the claim that both 'require' RuntimeClass too absolute and thus false.
What should I do if I get this CKS 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More CKS practice questions
- Which flag is used to restrict the kubelet's ability to modify node status and pods?
- A Falco rule has priority `WARNING` and output: `Sensitive file opened (user=%user.name command=%proc.cmdline file=%fd.n…
- Falco detects a shell being opened inside a container. Which Falco rule field is used to specify the syscall condition f…
- A security audit reveals that a ServiceAccount named 'monitor' has a ClusterRoleBinding to the cluster-admin role. What…
- Match each Kubernetes security component to its description.
- Match each Kubernetes certificate type to its usage.
Last reviewed: Jul 4, 2026
This CKS practice question is part of Courseiva's free CNCF 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 CKS exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.