About this practice test
The Certified Kubernetes Security Specialist (CKS) is the most advanced credential in the Kubernetes certification arc — issued by the Cloud Native Computing Foundation (CNCF) and administered by the Linux Foundation. It validates your ability to secure container-based applications and Kubernetes platforms at every layer: cluster hardening, system hardening, runtime detection, and the software supply chain.
This practice test gives you 250 scenario-style multiple-choice questions with detailed, multi-sentence explanations. Questions reference real tools (Falco, Trivy, Cosign, OPA Gatekeeper, Kyverno, AppArmor, seccomp, audit-policy), real configuration files, and real kubectl and OS commands. The bank follows the current CKS curriculum and matches the exam blueprint's domain weighting.
What the CKS exam covers
- Cluster Setup (10%) — restricting network access to Kubernetes nodes, NetworkPolicies for cluster components, CIS-benchmark hardening of cluster components, Ingress with TLS, GUI element security (e.g., Kubernetes dashboard), and verifying platform binaries before use.
- Cluster Hardening (15%) — restricting access to the Kubernetes API, role-based access control (RBAC) for least privilege, exercising caution in using ServiceAccounts (default disabled, mountServiceAccountToken: false), updating Kubernetes frequently to patch CVEs.
- System Hardening (15%) — minimizing host OS footprint to reduce attack surface, minimizing IAM roles on cloud nodes, minimizing external network access from nodes, kernel hardening tools (AppArmor, seccomp, Linux capabilities).
- Minimize Microservice Vulnerabilities (20%) — appropriate Pod Security Standards (Pod Security Admission), managing Kubernetes Secrets securely (encryption at rest, external secret stores), isolation techniques (sandboxed runtimes like gVisor / Kata Containers, namespace boundaries), implementing Pod-to-Pod encryption (Cilium WireGuard, Istio mTLS, Linkerd).
- Supply Chain Security (20%) — minimizing base-image footprint (distroless, scratch, multi-stage builds), understanding supply-chain risks (typosquatting, dependency confusion), allowlist-based image registries, signing and verifying images (Cosign, Sigstore), continuous static analysis of workloads, scanning images and dependencies for known vulnerabilities (Trivy, Grype, Snyk).
- Monitoring, Logging and Runtime Security (20%) — behavioral analytics at the host and container level to detect malicious activity, threat detection within physical infrastructure / apps / network / data / users / workloads, syscall-level detection (Falco), immutable infrastructure for containers (readOnlyRootFilesystem), enabling Kubernetes audit logs and analyzing them.
Exam format on the Linux Foundation
The live CKS is a 2-hour performance-based exam — you work in real Linux terminals on multiple Kubernetes clusters and solve hands-on security tasks. The passing score is 66%. The exam is open-book against the official Kubernetes documentation (kubernetes.io and kubernetes.io/blog only) plus the documentation for specifically allowed tools (Falco, Trivy, AppArmor, etc.). Recertification is required every 2 years.
Prerequisite: CKS requires a current, valid CKA certification. CKS questions assume CKA-level knowledge — RBAC syntax, NetworkPolicy structure, kubectl fluency — and build security depth on top of that foundation.
Our 250-question MCQ bank is the knowledge layer of preparation — covers every concept, tool, command, and YAML structure across the six CKS domains, so your hands-on practice in killer.sh simulators or your own cluster focuses on the operational muscle memory the live exam demands.
Who should take this?
Kubernetes administrators, platform engineers, DevSecOps engineers, security engineers building on Kubernetes, and anyone responsible for the security posture of production clusters. CNCF recommends at least 12 months of practical Kubernetes administration experience plus security expertise (network security, container security, host hardening). CKS rounds out the Kubernetes certification arc that begins with CKA and CKAD.
Free to attempt with a TestsWorld account. No card required.