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[General] KCSA Exam Quick Prep - KCSA Review Guide

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【General】 KCSA Exam Quick Prep - KCSA Review Guide

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Linux Foundation Kubernetes and Cloud Native Security Associate Sample Questions (Q17-Q22):NEW QUESTION # 17
Which step would give an attacker a foothold in a cluster butno long-term persistence?
  • A. Modify file on host filesystem.
  • B. Create restarting container on host using Docker.
  • C. Starting a process in a running container.
  • D. Modify Kubernetes objects stored within etcd.
Answer: C
Explanation:
* Starting a process in a running containerprovides an attacker withtemporary execution (foothold) inside the cluster, but once the container is stopped or restarted, that malicious process is lost. This means the attacker has nolong-term persistence.
* Incorrect options:
* (A) Modifying objects inetcdgrants persistent access since cluster state is stored in etcd.
* (B) Modifying files on thehost filesystemcan create persistence across reboots or container restarts.
* (D) Creating a restarting container directly on the host via Docker bypasses Kubernetes but persists across pod restarts if Docker restarts it.
References:
CNCF Security Whitepaper - Threat Modeling section: Describes howephemeral processes inside containersprovide attackers short-term control but not durable persistence.
Kubernetes Documentation - Cluster Threat Model emphasizes ephemeral vs. persistent attacker footholds.

NEW QUESTION # 18
What is the reasoning behind considering the Cloud as the trusted computing base of a Kubernetes cluster?
  • A. A Kubernetes cluster can only be as secure as the security posture of its Cloud hosting.
  • B. A vulnerability in the Cloud layer has a negligible impact on containers due to Linux isolation mechanisms.
  • C. The Cloud enforces security controls at the Kubernetes cluster level, so application developers can focus on applications only.
  • D. A Kubernetes cluster can only be trusted if the underlying Cloud provider is certified against international standards.
Answer: A
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 # 19
Which of the following statements is true concerning the use ofmicroVMsover user-space kernel implementations for advanced container sandboxing?
  • A. MicroVMs provide reduced application compatibility and higher per-system call overhead than user- space kernel implementations.
  • B. MicroVMs offer lower isolation and security compared to user-space kernel implementations.
  • C. MicroVMs allow for easier container management and orchestration than user-space kernel implementation.
  • D. MicroVMs offer higher isolation than user-space kernel implementations at the cost of a higher per- instance memory footprint.
Answer: D
Explanation:
* MicroVM-based runtimes(e.g., Firecracker, Kata Containers) use lightweight VMs to provide strong isolation between workloads.
* Compared touser-space kernel implementations(e.g., gVisor), microVMs generally:
* Offerhigher isolation and security(due to VM-level separation).
* Come with ahigher memory and resource overhead per instancethan user-space approaches.
* Incorrect options:
* (A) Orchestration is handled by Kubernetes, not inherently easier with microVMs.
* (C) Compatibility is typically better with microVMs, not worse.
* (D) Isolation is stronger, not weaker.
References:
CNCF Security Whitepaper - Workload isolation: microVMs vs. user-space kernel sandboxes.
Kata Containers Project - isolation trade-offs.

NEW QUESTION # 20
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 deleting the PodSecurity admission controller deployment running in their namespace.
  • D. By using higher-level access credentials obtained reading secrets from another 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 # 21
Which of the following represents a baseline security measure for containers?
  • A. Run containers as the root user.
  • B. Configuring a static IP for each container.
  • C. Configuring persistent storage for containers.
  • D. Implementing access control to restrict container access.
Answer: D
Explanation:
* Access control (RBAC, least privilege, user restrictions)is abaseline container security best practice.
* Exact extract (Kubernetes Pod Security Standards - Baseline):
* "The baseline profile is designed to prevent known privilege escalations. It prohibits running privileged containers or containers as root."
* Other options clarified:
* B: Static IPs not a security measure.
* C: Persistent storage is functionality, not security.
* D: Running as root is explicitlyinsecure.
References:
Kubernetes Docs - Pod Security Standards (Baseline): https://kubernetes.io/docs/concepts/security/pod- security-standards/

NEW QUESTION # 22
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