- A
Localhost
Why wrong: Localhost requires explicit configuration.
- B
No profile is applied
Why wrong: The runtime applies a profile by default.
- C
RuntimeDefault
Correct. The default is RuntimeDefault.
- D
Unconfined
Why wrong: Unconfined was the default in older versions but not in v1.29+.
Question 324 of 997
What Is the Default Seccomp Profile for Kubernetes Containers?
This CKS practice question tests your understanding of system hardening. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
What is the default seccomp profile for Kubernetes containers when no seccompProfile is specified?
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
✓
RuntimeDefault
When no `seccompProfile` is specified in the Pod or container security context, Kubernetes applies the `RuntimeDefault` seccomp profile by default. This profile is defined by the container runtime (e.g., containerd or CRI-O) and blocks a specific set of syscalls that are considered dangerous or unnecessary for containers, while allowing normal application operations. This default behavior was introduced in Kubernetes 1.19 and became the default for all pods in Kubernetes 1.22, enhancing security without requiring explicit configuration.
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.
- ✗
Localhost
Why it's wrong here
Localhost requires explicit configuration.
- ✗
No profile is applied
Why it's wrong here
The runtime applies a profile by default.
- ✓
RuntimeDefault
Why this is correct
Correct. The default is RuntimeDefault.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Unconfined
Why it's wrong here
Unconfined was the default in older versions but not in v1.29+.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common trap is the misconception that no seccomp profile means 'no restrictions' (Unconfined), but the correct default is `RuntimeDefault`, which applies a secure baseline profile automatically.
Detailed technical explanation
How to think about this question
The `RuntimeDefault` seccomp profile is defined by the container runtime (e.g., containerd uses a default profile that blocks around 44 syscalls, including `mount`, `ptrace`, and `perf_event_open`). This profile is applied at the container level via the `seccomp(2)` system call, and it is stored in the container runtime's configuration (e.g., `/proc/self/exe` for containerd). In a real-world scenario, if a pod needs to run a privileged operation like `chroot` or `clone` with certain flags, the `RuntimeDefault` profile may block it, requiring explicit seccomp tuning or a custom profile.
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.
- →
System Hardening — study guide chapter
Learn the concepts, then practise the questions
- →
System Hardening 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?
System Hardening — This question tests System Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: RuntimeDefault — When no `seccompProfile` is specified in the Pod or container security context, Kubernetes applies the `RuntimeDefault` seccomp profile by default. This profile is defined by the container runtime (e.g., containerd or CRI-O) and blocks a specific set of syscalls that are considered dangerous or unnecessary for containers, while allowing normal application operations. This default behavior was introduced in Kubernetes 1.19 and became the default for all pods in Kubernetes 1.22, enhancing security without requiring explicit configuration.
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.