一発合格問題KCNA厳選問題集

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Linux Foundation KCNA試験は、Kubernetes、コンテナ、アプリケーションの展開と管理、クラウドネイティブアーキテクチャ、トラブルシューティングなど、様々なトピックをカバーしています。この認定はクラウドネイティブ技術に関する実践的な経験やクラウドネイティブ環境でアプリケーションをデプロイ、管理、スケールする能力をテストしています。この試験には、Kubernetesコンテナオーケストレーターとそのコアコンポーネントに深い理解が必要です。

Linux Foundation Kubernetes and Cloud Native Associate 認定 KCNA 試験問題 (Q69-Q74):

質問 # 69
Can a Kubernetes Service expose multiple ports?

正解：A

解説：
Yes, a Kubernetes Service can expose multiple ports, and when it does, each port should have a unique, unambiguous name, making B correct. In the Service spec, the ports field is an array, allowing you to define multiple port mappings (e.g., 80 for HTTP and 443 for HTTPS, or grpc and metrics). Each entry can include port (Service port), targetPort (backend Pod port), and protocol.
The naming requirement becomes important because Kubernetes needs to disambiguate ports, especially when other resources refer to them. For example, an Ingress backend or some proxies/controllers can reference Service ports by name. Also, when multiple ports exist, a name helps humans and automation reliably select the correct port. Kubernetes documentation and common practice recommend naming ports whenever there is more than one, and in several scenarios it's effectively required to avoid ambiguity.
Option A is incorrect because multi-port Services are common and fully supported. Option C is insufficient: while different port numbers are necessary, naming is the correct distinguishing rule emphasized by Kubernetes patterns and required by some integrations. Option D is incorrect and nonsensical-Services can expose many ports and are not restricted to 443.
Operationally, exposing multiple ports through one Service is useful when a single backend workload provides multiple interfaces (e.g., application traffic and a metrics endpoint). You can keep stable discovery under one DNS name while still differentiating ports. The backend Pods must still listen on the target ports, and selectors determine which Pods are endpoints. The key correctness point for this question is: multi-port Services are allowed, and each port should be uniquely named to avoid confusion and integration issues.


質問 # 70
You want to deploy a new microservice to your Kubernetes cluster using GitOps principles. Which of
the following approaches would you use to manage the deployment process?

正解：B

解説：
GitOps emphasizes the use of Git as the single source of truth for managing your cluster's desired state. Option C correctly describes the GitOps approach by storing the configuration in a Git repository and using a GitOps tool to manage deployments, ensuring consistency and traceability.


質問 # 71
What is the default eviction timeout when the Ready condition of a node is Unknown or False?

正解：B

解説：
The default eviction timeout for a node whose Ready condition is Unknown or False is five minutes before pods on that node are evicted.


質問 # 72
What command is often used to troubleshoot a failing Pod?

正解：A

解説：
The kubectl describe command provides detailed information about a Pod, including events, status conditions, and error messages, making it a primary tool for troubleshooting Pod failures.


質問 # 73
What is the main purpose of the Open Container Initiative (OCI)?

正解：C

解説：
B is correct: the OCI's main purpose is to create open, vendor-neutral industry standards for container image formats and container runtimes. Standardization is critical in container orchestration because portability is a core promise: you should be able to build an image once and run it across different environments and runtimes without rewriting packaging or execution logic.
OCI defines (at a high level) two foundational specs:
Image specification: how container images are packaged (layers, metadata, manifests).
Runtime specification: how to run a container (filesystem setup, namespaces/cgroups behavior, lifecycle).
These standards enable interoperability across tooling. For example, higher-level runtimes (like containerd or CRI-O) rely on OCI-compliant components (often runc or equivalents) to execute containers consistently.
Why the other options are not the best answer:
A (accelerating adoption) might be an indirect outcome, but it's not the OCI's core charter.
C is contradictory ("industry standards" but "for private purposes")-OCI is explicitly about open standards.
D (improving security) can be helped by standardization and best practices, but OCI is not primarily a security standards body; its central function is format and runtime interoperability.
In Kubernetes specifically, OCI is part of the "plumbing" that makes runtimes replaceable. Kubernetes talks to runtimes via CRI; runtimes execute containers via OCI. This layering helps Kubernetes remain runtime-agnostic while still benefiting from consistent container behavior everywhere.
Therefore, the correct choice is B: OCI creates open standards around container formats and runtimes.


質問 # 74
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