KCSA PDF Dumps Real 2025 Recently Updated Questions [Q14-Q32]

KCSA PDF Dumps Real 2025 Recently Updated Questions

Released Linux Foundation KCSA Updated Questions PDF

NEW QUESTION # 14
A cluster administrator wants to enforce the use of a different container runtime depending on the application a workload belongs to.

• A. By manually modifying the container runtime for each workload after it has been created.
• B. By configuring amutating admission controllerwebhook that intercepts new workload creation requests and modifies the container runtime based on the application label.
• C. By modifying the kube-apiserver configuration file to specify the desired container runtime for each application.
• D. By configuring avalidating admission controllerwebhook that verifies the container runtime based on the application label and rejects requests that do not comply.

Answer: B

Explanation:
* Kubernetes supports workload-specific runtimes viaRuntimeClass.
* Amutating admission controllercan enforce this automatically by:
* Intercepting workload creation requests.
* Modifying the Pod spec to set runtimeClassName based on labels or policies.
* Incorrect options:
* (A) Manual modification is not scalable or secure.
* (B) kube-apiserver cannot enforce per-application runtime policies.
* (C) A validating webhook can onlyreject, not modify, the runtime.
References:
Kubernetes Documentation - RuntimeClass
CNCF Security Whitepaper - Admission controllers for enforcing runtime policies.

NEW QUESTION # 15
What is the main reason an organization would use a Cloud Workload Protection Platform (CWPP) solution?

• A. To protect containerized workloads from known vulnerabilities and malware threats.
• B. To manage networking between containerized workloads in the Kubernetes cluster.
• C. To optimize resource utilization and scalability of containerized workloads.
• D. To automate the deployment and management of containerized workloads.

Answer: A

Explanation:
* CWPP (Cloud Workload Protection Platform):As defined by Gartner and adopted across cloud security practices, CWPPs are designed tosecure workloads(VMs, containers, serverless functions) in hybrid and cloud environments.
* They providevulnerability scanning, runtime protection, compliance checks, and malware detection.
* Exact extract (Gartner CWPP definition):"Cloud workload protection platforms protect workloads regardless of location, including physical machines, VMs, containers, and serverless workloads. They provide vulnerability management, system integrity protection, intrusion detection and prevention, and malware protection." References:
Gartner: Cloud Workload Protection Platforms Market Guide (summary): https://www.gartner.com/reviews
/market/cloud-workload-protection-platforms
CNCF Security Whitepaper:https://github.com/cncf/tag-security

NEW QUESTION # 16
Which of the following is a valid security risk caused by having no egress controls in a Kubernetes cluster?

• A. Unauthorized access to external resources
• B. Data exfiltration
• C. Denial of Service
• D. Increased attack surface

Answer: B

Explanation:
* Egress NetworkPoliciesrestrict outbound traffic from Pods.
* Without egress restrictions, a compromised Pod could exfiltrate sensitive data (secrets, logs, customer data) to an attacker-controlled server.
* Exact extract (Kubernetes Docs - Network Policies):
* "Egress rules control outbound connections from Pods. Without such restrictions, compromised workloads can connect freely to external endpoints."
* Other options clarified:
* A: DoS is more about flooding, not egress absence.
* C: "Increased attack surface" is vague but not the main risk.
* D: True in a sense, but the precise and most common risk isdata exfiltration.
References:
Kubernetes Docs - Network Policies: https://kubernetes.io/docs/concepts/services-networking/network- policies/

NEW QUESTION # 17
When should soft multitenancy be used over hard multitenancy?

• A. When the priority is enabling resource sharing and efficiency between tenants.
• B. When the priority is enabling complete isolation between tenants.
• C. When the priority is enabling strict security boundaries between tenants.
• D. When the priority is enabling fine-grained control over tenant resources.

Answer: A

Explanation:
* Soft multitenancy(Namespaces, RBAC, Network Policies) # assumes some level of trust between tenants, focuses onresource sharing and efficiency.
* Hard multitenancy(separate clusters or strong virtualization) # strict isolation, used when tenants are untrusted.
* Exact extract (CNCF TAG Security Multi-Tenancy Whitepaper):
* "Soft multi-tenancy refers to multiple workloads running in the same cluster with some trust assumptions. It provides resource sharing and operational efficiency. Hard multi- tenancy requires stronger isolation guarantees, typically separate clusters." References:
CNCF Security TAG - Multi-Tenancy Whitepaper:https://github.com/cncf/tag-security/tree/main/multi- tenancy

NEW QUESTION # 18
How do Kubernetes namespaces impact the application of policies when using Pod Security Admission?

• A. Different policies can be applied to specific namespaces.
• B. The default namespace enforces the strictest security policies by default.
• C. Namespaces are ignored; Pod Security Admission policies apply cluster-wide only.
• D. Each namespace can have only one active policy.

Answer: A

Explanation:
* Pod Security Admission (PSA)enforces policies by applyinglabels on namespaces, not globally across the cluster.
* Exact extract (Kubernetes Docs - Pod Security Admission):
* "You can apply Pod Security Standards to namespaces by adding labels such as pod- security.kubernetes.io/enforce. Different namespaces can enforce different policies."
* Clarifications:
* A: Incorrect, namespaces are the unit of enforcement.
* C: Misleading - a namespace can have multiple enforcement modes (enforce, audit, warn).
* D: Default namespace doesnotenforce strict policies unless labeled.
References:
Kubernetes Docs - Pod Security Admission: https://kubernetes.io/docs/concepts/security/pod-security- admission/

NEW QUESTION # 19
Which of the following statements best describes the role of the Scheduler in Kubernetes?

• A. The Scheduler is responsible for monitoring and managing the health of the Kubernetes cluster.
• B. The Scheduler is responsible for managing the deployment and scaling of applications in the Kubernetes cluster.
• C. The Scheduler is responsible for ensuring the security of the Kubernetes cluster and its components.
• D. The Scheduler is responsible for assigning Pods to nodes based on resource availability and other constraints.

Answer: D

Explanation:
* TheKubernetes Schedulerassigns Pods to nodes based on:
* Resource requests & availability (CPU, memory, GPU, etc.)
* Constraints (affinity, taints, tolerations, topology, policies)
* Exact extract (Kubernetes Docs - Scheduler):
* "The scheduler is a control plane process that assigns Pods to Nodes. Scheduling decisions take into account resource requirements, affinity/anti-affinity, constraints, and policies."
* Other options clarified:
* A: Monitoring cluster health is theController Manager's/kubelet's job.
* B: Security is enforced throughRBAC, admission controllers, PSP/PSA, not the scheduler.
* C: Deployment scaling is handled by theController Manager(Deployment/ReplicaSet controller).
References:
Kubernetes Docs - Scheduler: https://kubernetes.io/docs/concepts/scheduling-eviction/kube-scheduler/

NEW QUESTION # 20
What is the reasoning behind considering the Cloud as the trusted computing base of a Kubernetes cluster?

• A. A Kubernetes cluster can only be trusted if the underlying Cloud provider is certified against international standards.
• B. A Kubernetes cluster can only be as secure as the security posture of its Cloud hosting.
• C. The Cloud enforces security controls at the Kubernetes cluster level, so application developers can focus on applications only.
• D. A vulnerability in the Cloud layer has a negligible impact on containers due to Linux isolation mechanisms.

Answer: B

Explanation:
* The4C's of Cloud Native Security(Cloud, Cluster, Container, Code) model starts withCloudas the base layer.
* If the Cloud (infrastructure layer) is compromised, every higher layer (Cluster, Container, Code) inherits that compromise.
* Exact extract (Kubernetes Security Overview):
* "The 4C's of Cloud Native security are Cloud, Clusters, Containers, and Code. You can think of the 4C's as a layered approach. A Kubernetes cluster can only be as secure as the cloud infrastructure it is deployed on."
* This means the cloud is part of thetrusted computing baseof a Kubernetes cluster.
References:
Kubernetes Docs - Security Overview (4C's): https://kubernetes.io/docs/concepts/security/overview/#the-
4cs-of-cloud-native-security

NEW QUESTION # 21
A Kubernetes cluster tenant can launch privileged Pods in contravention of therestricted Pod Security Standardmandated for cluster tenants and enforced by the built-inPodSecurity admission controller.
The tenant has full CRUD permissions on the namespace object and the namespaced resources. How did the tenant achieve this?

• A. The scope of the tenant role means privilege escalation is impossible.
• B. By tampering with the namespace labels.
• C. By using higher-level access credentials obtained reading secrets from another namespace.
• D. By deleting the PodSecurity admission controller deployment running in their namespace.

Answer: B

Explanation:
* ThePodSecurity admission controllerenforces Pod Security Standards (Baseline, Restricted, Privileged)based on namespace labels.
* If a tenant has full CRUD on the namespace object, they canmodify the namespace labelsto remove or weaken the restriction (e.g., setting pod-security.kubernetes.io/enforce=privileged).
* This allows privileged Pods to be admitted despite the security policy.
* Incorrect options:
* (A) is false - namespace-level access allows tampering.
* (C) is invalid - PodSecurity admission is not namespace-deployed, it's a cluster-wide admission controller.
* (D) is unrelated - Secrets from other namespaces wouldn't directly bypass PodSecurity enforcement.
References:
Kubernetes Documentation - Pod Security Admission
CNCF Security Whitepaper - Admission control and namespace-level policy enforcement weaknesses.

NEW QUESTION # 22
A container image istrojanizedby an attacker by compromising the build server. Based on the STRIDE threat modeling framework, which threat category best defines this threat?

• A. Tampering
• B. Denial of Service
• C. Repudiation
• D. Spoofing

Answer: A

Explanation:
* In STRIDE,Tamperingis the threat category forunauthorized modification of data or code/artifacts. A trojanized container image is, by definition, an attacker'smodificationof the build output (the image) after compromising the CI/build system-i.e., tampering with the artifact in the software supply chain.
* Why not the others?
* Spoofingis about identity/authentication (e.g., pretending to be someone/something).
* Repudiationis about denying having performed an action without sufficient audit evidence.
* Denial of Servicetargets availability (exhausting resources or making a service unavailable).The scenario explicitly focuses on analtered imageresulting from a compromised build server-this squarely maps toTampering.
Authoritative references (for verification and deeper reading):
* Kubernetes (official docs)- Supply Chain Security (discusses risks such as compromised CI/CD pipelines leading to modified/poisoned images and emphasizes verifying image integrity/signatures).
* Kubernetes Docs#Security#Supply chain securityandSecuring a cluster(sections on image provenance, signing, and verifying artifacts).
* CNCF TAG Security - Cloud Native Security Whitepaper (v2)- Threat modeling in cloud-native and software supply chain risks; describes attackers modifying build outputs (images/artifacts) via CI
/CD compromise as a form oftamperingand prescribes controls (signing, provenance, policy).
* CNCF TAG Security - Software Supply Chain Security Best Practices- Explicitly covers CI/CD compromise leading tomaliciously modified imagesand recommends SLSA, provenance attestation, and signature verification (policy enforcement via admission controls).
* Microsoft STRIDE (canonical reference)- DefinesTamperingasmodifying data or code, which directly fits a trojanized image produced by a compromised build system.

NEW QUESTION # 23
In the event that kube-proxy is in a CrashLoopBackOff state, what impact does it have on the Pods running on the same worker node?

• A. The Pod's resource utilization increases significantly.
• B. The Pod cannot mount persistent volumes through CSI drivers.
• C. The Pods cannot communicate with other Pods in the cluster.
• D. The Pod's security context restrictions cannot be enforced.

Answer: C

Explanation:
* kube-proxy:manages cluster network routing rules (via iptables or IPVS). It enables Pods to communicate with Services and Pods across nodes.
* If kube-proxy fails (CrashLoopBackOff), service IP routing and cluster-wide pod-to-pod networking breaks. Local Pod-to-Pod communication within the same node may still work, butcross-node communication fails.
* Exact extract (Kubernetes Docs - kube-proxy):
* "kube-proxy maintains network rules on nodes. These rules allow network communication to Pods from network sessions inside or outside of the cluster." References:
Kubernetes Docs - kube-proxy: https://kubernetes.io/docs/reference/command-line-tools-reference/kube- proxy/

NEW QUESTION # 24
In Kubernetes, what isPublic Key Infrastructure (PKI)used for?

• A. To manage networking in a Kubernetes cluster.
• B. To monitor and analyze performance metrics of a Kubernetes cluster.
• C. To automate the scaling of containers in a Kubernetes cluster.
• D. To manage certificates and ensure secure communication in a Kubernetes cluster.

Answer: D

Explanation:
* Kubernetes usesPKI certificatesextensively to secure communication between control plane components (API server, etcd, kube-scheduler, kube-controller-manager) and with kubelets.
* Certificates enablemutual TLS authentication and encryptionacross components.
* PKI does not handle scaling, networking, or monitoring.
References:
Kubernetes Documentation - Certificates
CNCF Security Whitepaper - Cluster communication security and the role of PKI.

NEW QUESTION # 25
What is the purpose of the Supplier Assessments and Reviews control in the NIST 800-53 Rev. 5 set of controls for Supply Chain Risk Management?

• A. To evaluate and monitor existing suppliers for adherence to security requirements.
• B. To establish contractual agreements with suppliers.
• C. To conduct regular audits of suppliers' financial performance.
• D. To identify potential suppliers for the organization.

Answer: A

Explanation:
* In NIST SP 800-53 Rev. 5,SR-6: Supplier Assessments and Reviewsrequires evaluating and monitoring suppliers' security and risk practices.
* Exact extract (NIST SP 800-53 Rev. 5, SR-6):
* "The organization assesses and monitors suppliers to ensure they are meeting the security requirements specified in contracts and agreements."
* This is aboutongoing monitoringof supplier adherence, not financial audits, not contract creation, and not supplier discovery.
References:
NIST SP 800-53 Rev. 5, Control SR-6 (Supplier Assessments and Reviews): https://csrc.nist.gov/publications
/detail/sp/800-53/rev-5/final

NEW QUESTION # 26
As a Kubernetes and Cloud Native Security Associate, a user can set upaudit loggingin a cluster. What is the risk of logging every event at the fullRequestResponselevel?

• A. Reduced storage requirements and faster performance.
• B. No risk, as it provides the most comprehensive audit trail.
• C. Increased storage requirements and potential impact on performance.
• D. Improved security and easier incident investigation.

Answer: C

Explanation:
* Audit loggingrecords API server requests and responses for security monitoring.
* TheRequestResponse levellogs the full request and response bodies, which can:
* Significantly increasestorage and performance overhead.
* Potentially log sensitive data (including Secrets).
* Therefore, while comprehensive, it introduces risks of performance degradation and excessive log volume.
References:
Kubernetes Documentation - Auditing
CNCF Security Whitepaper - Logging and monitoring: trade-offs between verbosity, storage, and security.

NEW QUESTION # 27
What is a multi-stage build?

• A. A build process that involves multiple stages of image creation, allowing for smaller, optimized images.
• B. A build process that involves multiple containers running simultaneously to speed up the image creation.
• C. A build process that involves multiple repositories for storing container images.
• D. A build process that involves multiple developers collaborating on building an image.

Answer: A

Explanation:
* Multi-stage buildsare a Docker/Kaniko feature that allows building images in multiple stages # final image contains only runtime artifacts, not build tools.
* This reducesimage size, attack surface, and security risks.
* Exact extract (Docker Docs):
* "Multi-stage builds allow you to use multiple FROM statements in a Dockerfile. You can copy artifacts from one stage to another, resulting in smaller, optimized images."
* Clarifications:
* A: Collaboration is not the definition.
* B: Multiple repositories # multi-stage builds.
* C: Build concurrency # multi-stage builds.
References:
Docker Docs - Multi-Stage Builds: https://docs.docker.com/develop/develop-images/multistage-build/

NEW QUESTION # 28
Which label should be added to the Namespace to block any privileged Pods from being created in that Namespace?

• A. privileged: false
• B. pod-security.kubernetes.io/enforce: baseline
• C. pod.security.kubernetes.io/privileged: false
• D. privileged: true

Answer: B

Explanation:
* KubernetesPod Security Admission (PSA)enforcesPod Security Standardsby applying labels on Namespaces.
* Exact extract (Kubernetes Docs - Pod Security Admission):
* "You can label a namespace with pod-security.kubernetes.io/enforce: baseline to enforce the Baseline policy."
* Thebaselineprofile explicitly disallowsprivileged podsand other unsafe features.
* Why others are wrong:
* A & D: These labels do not exist in Kubernetes.
* B: Setting privileged: true would allow privileged pods, not block them.
References:
Kubernetes Docs - Pod Security Admission: https://kubernetes.io/docs/concepts/security/pod-security- admission/ Kubernetes Docs - Pod Security Standards: https://kubernetes.io/docs/concepts/security/pod-security- standards/

NEW QUESTION # 29
What was the name of the precursor to Pod Security Standards?

• A. Pod Security Policy
• B. Container Runtime Security
• C. Kubernetes Security Context
• D. Container Security Standards

Answer: A

Explanation:
* Kubernetes originally had a feature calledPodSecurityPolicy (PSP), which provided controls to restrict pod behavior.
* Official docs:
* "PodSecurityPolicy was deprecated in Kubernetes v1.21 and removed in v1.25."
* "Pod Security Standards (PSS) replace PodSecurityPolicy (PSP) with a simpler, policy- driven approach."
* PSP was often complex and hard to manage, so it was replaced by Pod Security Admission (PSA) which enforcesPod Security Standards.
References:
Kubernetes Docs - PodSecurityPolicy (deprecated): https://kubernetes.io/docs/concepts/security/pod- security-policy/ Kubernetes Blog - PodSecurityPolicy Deprecation: https://kubernetes.io/blog/2021/04/06/podsecuritypolicy- deprecation-past-present-and-future/

NEW QUESTION # 30
Which information does a user need to verify a signed container image?

• A. The image's SHA-256 hash and the public key of the signing authority.
• B. The image's SHA-256 hash and the private key of the signing authority.
• C. The image's digital signature and the public key of the signing authority.
• D. The image's digital signature and the private key of the signing authority.

Answer: C

Explanation:
* Container image signing (e.g., withcosign, Notary v2) uses asymmetric cryptography.
* Verification process:
* Retrieve theimage's digital signature.
* Validate the signature with thepublic keyof the signer.
* Exact extract (Sigstore Cosign Docs):
* "Verification of an image requires the signature and the signer's public key. The signature proves authenticity and integrity."
* Why others are wrong:
* A & B: The private key is only used by the signer, never shared.
* C: The hash alone cannot prove authenticity without the digital signature.
References:
Sigstore Cosign Docs: https://docs.sigstore.dev/cosign/overview

NEW QUESTION # 31
Which of the following statements best describes the role of the Scheduler in Kubernetes?

• A. The Scheduler is responsible for monitoring and managing the health of the Kubernetes cluster.
• B. The Scheduler is responsible for managing the deployment and scaling of applications in the Kubernetes cluster.
• C. The Scheduler is responsible for ensuring the security of the Kubernetes cluster and its components.
• D. The Scheduler is responsible for assigning Pods to nodes based on resource availability and other constraints.

Answer: D

Explanation:
* TheKubernetes Schedulerassigns Pods to nodes based on:
* Resource requests & availability (CPU, memory, GPU, etc.)
* Constraints (affinity, taints, tolerations, topology, policies)
* Exact extract (Kubernetes Docs - Scheduler):
* "The scheduler is a control plane process that assigns Pods to Nodes. Scheduling decisions take into account resource requirements, affinity/anti-affinity, constraints, and policies."
* Other options clarified:
* A: Monitoring cluster health is theController Manager's/kubelet's job.
* B: Security is enforced throughRBAC, admission controllers, PSP/PSA, not the scheduler.
* C: Deployment scaling is handled by theController Manager(Deployment/ReplicaSet controller).
References:
Kubernetes Docs - Scheduler: https://kubernetes.io/docs/concepts/scheduling-eviction/kube-scheduler/

NEW QUESTION # 32
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