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Linux Foundation Kubernetes and Cloud Native Security Associate Sample Questions (Q25-Q30):

NEW QUESTION # 25
What is the purpose of an egress NetworkPolicy?

A. To secure the Kubernetes cluster against unauthorized access.
B. To control the outgoing network traffic from one or more Kubernetes Pods.
C. To control the incoming network traffic to a Kubernetes cluster.
D. To control the outbound network traffic from a Kubernetes cluster.

Answer: B

Explanation:
* NetworkPolicycontrols network trafficat the Pod level.
* Ingress rules:controlincomingconnections to Pods.
* Egress rules:controloutgoingconnectionsfrom Pods.
* Exact extract (Kubernetes Docs - Network Policies):
* "An egress rule controls outgoing connections from Pods that match the policy."
* Clarifying wrong answers:
* A/B: Too broad (cluster-level); policies apply per Pod/Namespace.
* C: Security against unauthorized access is broader than egress policies.
References:
Kubernetes Docs - Network Policies: https://kubernetes.io/docs/concepts/services-networking/network- policies/

NEW QUESTION # 26
You are responsible for securing thekubeletcomponent in a Kubernetes cluster.
Which of the following statements about kubelet security is correct?

A. Kubelet requires root access to interact with the host system.
B. Kubelet runs as a privileged container by default.
C. Kubelet supports TLS authentication and encryption for secure communication with the API server.
D. Kubelet does not have any built-in security features.

Answer: C

Explanation:
* Thekubeletis the primary agent that runs on each node in a Kubernetes cluster and communicates with the control plane.
* Kubeletsupports TLS (Transport Layer Security)for both authentication and encryption when interacting with the API server. This is a core security feature that ensures secure node-to-control-plane communication.
* Incorrect options:
* (A) Kubelet does not run as a privileged container by default; it runs as a system process (typically systemd-managed) on the host.
* (B) Kubelet does include built-in security features such asTLS authentication, authorization modes, and read-only vs secured ports.
* (D) While kubelet interacts with the host system (e.g., cgroups, container runtimes), it does not inherently require root access for communication security; RBAC and TLS handle authentication.
References:
Kubernetes Documentation - Kubelet authentication/authorization
CNCF Security Whitepaper - Cluster Component Security (discusses TLS and mutual authentication between kubelet and API server).

NEW QUESTION # 27
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. Denial of Service
B. Repudiation
C. Spoofing
D. Tampering

Answer: D

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 # 28
What is the difference between gVisor and Firecracker?

A. gVisor and Firecracker are two names for the same technology, which provides isolation and security for containers.
B. gVisor and Firecracker are both container runtimes that can be used interchangeably.
C. gVisor is a lightweight virtualization technology for creating and managing secure, multi-tenant container and function-as-a-service (FaaS) workloads. At the same time, Firecracker is a user-space kernel that provides isolation and security for containers.
D. gVisor is a user-space kernel that provides isolation and security for containers. At the same time, Firecracker is a lightweight virtualization technology for creating and managing secure, multi-tenant container and function-as-a-service (FaaS) workloads.

Answer: D

Explanation:
* gVisor:
* Google-developed, implemented as auser-space kernelthat intercepts and emulates syscalls made by containers.
* Providesstrong isolationwithout requiring a full VM.
* Official docs: "gVisor is a user-space kernel, written in Go, that implements a substantial portion of the Linux system call interface."
* Source: https://gvisor.dev/docs/
* Firecracker:
* AWS-developed,lightweight virtualization technologybuilt on KVM, used in AWS Lambda and Fargate.
* Optimized for running secure, multi-tenant microVMs (MicroVMs) for containers and FaaS.
* Official docs: "Firecracker is an open-source virtualization technology that is purpose-built for creating and managing secure, multi-tenant container and function-based services."
* Source: https://firecracker-microvm.github.io/
* Key difference:gVisor # syscall interception in userspace kernel (container isolation). Firecracker # lightweight virtualization with microVMs (multi-tenant security).
* Therefore, optionAis correct.
References:
gVisor Docs: https://gvisor.dev/docs/
Firecracker Docs: https://firecracker-microvm.github.io/

NEW QUESTION # 29
A cluster administrator wants to enforce the use of a different container runtime depending on the application a workload belongs to.

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

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 # 30
......

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