CKS (Certified Kubernetes Security Specialist (CNCF)) — Free Online Mock Test
2h hands-on perf task · cluster hardening, system hardening, microservice vulns, supply-chain. Requires CKA as prerequisite. · Official language: English.
CKS exam at a glance
CKS full-length mock tests
Attempt 50 full-length CKS mock tests, each a distinct question set built on the real 16-question, 120-minute pattern — with instant scoring and section-wise analysis. The first 3 are free.
See all 50 CKS mock tests →CKS key facts & eligibility
| Conducting body | Cloud Native Computing Foundation (CNCF) and the Linux Foundation |
|---|---|
| Official website | training.linuxfoundation.org ↗ |
| Mode | The Certified Kubernetes Security Specialist (CKS) — a certification validating the skills to secure container-based applications and Kubernetes platforms at build, deployment and runtime. It is aimed at practitioners who already administer Kubernetes. |
| Frequency | Offered year-round, online and remotely proctored, by appointment. |
| Scoring & marking | The exam is entirely performance-based — hands-on command-line tasks on running Kubernetes clusters within 2 hours, with no multiple-choice questions. The passing score is 67%, and the exam includes a free second attempt. |
| Score validity | The certification is valid for 2 years; it is renewed by retaking and passing the exam. |
| Language | English, Simplified Chinese and Japanese. |
Who is eligible for CKS?
Candidates must have taken and passed the Certified Kubernetes Administrator (CKA) exam before attempting the CKS.
Last verified July 2026 against Linux Foundation — CKS. Always confirm current details on the official website before you register.
CKS section breakdown
The CKS mock test on Wrexa Edge replicates the real exam's section structure — same names, same question count per section, same time limits. No inter-section breaks — the timer runs continuously.
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CKS performance tasks (16 tasks)
CKS scoring & marking scheme
Strategy: CKS has no negative marking. Attempt every question — blank answers cost you potential marks but cannot pull your score down.
Scale: CKS (pass 67%).
How CKS is conducted
- Mode
- Test format
- Backtracking
- Mark for review
CKS time strategy
With 16 questions in 120 minutes, you have about 450 seconds per question on average. Successful candidates aim for the following pacing on each section:
- CKS performance tasks (16 tasks)
Wrexa Edge's analytics show your actual time-per-question after every mock so you can spot which sections you're losing time on.
CKS topics covered
Across the 50 Wrexa Edge variants of CKS, the following topics appear most often (sample distribution from one variant):
CKS performance tasks (16 tasks)
- Kubernetes — Nodes · 3
- Kubernetes — Deployments · 2
- Kubernetes — Rollout · 2
- Kubernetes — RBAC · 1
- Linux — Users · 1
- Linux — Permissions · 1
- Linux — Services · 1
- Linux — Disk · 1
CKS difficulty calibration
Elite tier. Elite-tier: among the toughest exams in its category. Most successful candidates prepare for 6-12+ months.
2h hands-on perf task · cluster hardening, system hardening, microservice vulns, supply-chain. Requires CKA as prerequisite. · Official language: English.
Verified content — Wrexa Edge's CKS bank has been deeply curated with real exam-aligned content (estimated 100% syllabus coverage).
How Wrexa Edge prepares you for CKS
- Real test-day interface
- 50 distinct variants
- Detailed analytics
- Spaced repetition (Notebook)
- Optional proctoring
- Free to start
Expert take: what CKS really tests
The Certified Kubernetes Security Specialist (CKS), from the CNCF and the Linux Foundation, validates securing container-based applications and Kubernetes platforms at build, deployment and runtime. It is entirely performance-based — hands-on tasks on live clusters within 2 hours, with a passing score of 67% and a free second attempt. Candidates must have passed the CKA exam beforehand, and the certification is valid for 2 years.
Preparation tips
- Hold the CKA first — it is a prerequisite for CKS.
- Practise cluster hardening, runtime security and supply-chain security.
- Use the killer.sh simulator included with the exam.
Common mistakes to avoid
- Attempting CKS without solid CKA-level administration skills.
- Neglecting runtime detection and admission control.
CKS study plan
A phase-by-phase roadmap from your first concept to test-ready. Stretch or compress each phase to fit the time you have before your attempt.
- CIS benchmarks
- RBAC and network policies
- Supply-chain security
- Runtime detection (Falco)
- Secrets and admission control
- Monitoring and auditing
- killer.sh simulator
- Speed with kubectl
- Aim for 67%
Where CKS can take you
A strong CKS result opens up these careers and higher-study paths:
- Kubernetes security specialist
- Requires CKA first
Best books & official prep for CKS
- Kubernetes security documentation & CKS curriculum — CNCF / Kubernetes
- CKS practice (killer.sh simulator) — Linux Foundation
Official practice: Hold the CKA first, then practise cluster hardening, supply-chain security, runtime security and monitoring hands-on; the pass mark is 67%.
Previous-year papers: The Linux Foundation publishes the curriculum and provides simulator sessions.
Frequently asked questions
- What is the CKS exam pattern?
- Certified Kubernetes Security Specialist (CNCF) contains 16 questions across 1 section: CKS performance tasks (16 tasks). Total duration is 120 minutes (about 450 seconds per question).
- Does CKS have negative marking?
- No — CKS has no negative marking. Each correct answer is worth 1 mark, so attempt every question.
- How is CKS scored?
- Scaled score range: 0 to 100. CKS (pass 67%).
- How can I practise CKS online for free?
- Wrexa Edge gives you 3 free full-length CKS mock tests — with instant scoring, detailed explanations and analytics — plus 47 more with Pro. Start practising in under a minute, no card required.
- What is the difficulty level of CKS?
- CKS is rated Elite difficulty on Wrexa Edge. Elite-tier: among the toughest exams in its category. Most successful candidates prepare for 6-12+ months. 2h hands-on perf task · cluster hardening, system hardening, microservice vulns, supply-chain. Requires CKA as prerequisite. · Official language: English.
- How long is the CKS exam?
- CKS runs for 120 minutes total. On Wrexa Edge the timer is enforced exactly as on the real exam — including no inter-section breaks.
- What topics are covered in CKS?
- CKS is split into: CKS performance tasks (16 tasks). Each section is timed and weighted separately. 2h hands-on perf task · cluster hardening, system hardening, microservice vulns, supply-chain. Requires CKA as prerequisite. · Official language: English.
- What tools or aids are allowed during CKS?
- No special tools are required. Note: real exam is proctored — Wrexa Edge mirrors this with a webcam-based proctoring flow you can enable.
- Is the CKS test adaptive?
- No — CKS is a fixed-form (linear) test. Every candidate sees the same number of questions per section.
- How many CKS mock tests does Wrexa Edge offer?
- Wrexa Edge generates 50 distinct CKS variants — each with different question content, not just shuffled options — the first 3 free for everyone and 47 more with Pro. That's 800 unique practice questions in the real test-day interface.
- Is there a free CKS test series 2026?
- Yes. The Wrexa Edge CKS test series for 2026 gives you 3 free full-length mock tests (50 in total) plus subject-wise and topic-wise tests — instant scoring and detailed analysis, no card required.
- Are CKS previous year question–style papers included?
- Every CKS mock is modelled on the official exam pattern and the style of previous years' papers — the same 16-question structure, sections and marking — so your practice mirrors the real paper you'll sit.
- Which is the best free CKS mock test online?
- Wrexa Edge's CKS mock test replicates the real exam interface, timing and marking scheme, with instant score, section-wise analysis and 50 fresh variants — a strong free choice for 2026 preparation.
- Can I take the CKS mock test on mobile?
- Yes. CKS mock tests run in any browser on mobile, tablet or desktop — no app or download needed. Start on your phone and your progress and analytics sync when you sign in.
- What is the CKS syllabus?
- The CKS syllabus maps to its 1 section: CKS performance tasks (16 tasks). Wrexa Edge's mock tests cover the complete syllabus topic by topic — see the topics-covered breakdown above — so you practise every area at real exam difficulty.
- What is the eligibility for CKS?
- Candidates must have taken and passed the Certified Kubernetes Administrator (CKA) exam before attempting the CKS. Wrexa Edge focuses on realistic CKS practice: 3 free full-length mocks in the exact exam pattern, ready whenever you are.
- When is the CKS exam and how should I prepare?
- Official CKS exam dates are announced by the conducting body for each cycle — check the latest notification for the current schedule. To be ready, follow a phased study plan and take full-length timed mocks; Wrexa Edge gives you 3 free CKS mocks with instant scoring so you can track your readiness week by week.
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