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Linux Foundation KCNA Exam Syllabus Topics:

SectionWeightObjectives
Cloud Native Observability8%- Logging & Tracing
  • 1. Centralized logging
    • 2. Distributed tracing basics
      - Monitoring & Metrics
      • 1. Tools and standards
        • 2. Core observability signals
          Cloud Native Architecture16%- Ecosystem & Landscape
          • 1. CNCF projects overview
            • 2. Serverless, service mesh concepts
              - Cloud Native Principles
              • 1. 12-factor applications
                • 2. Microservices design
                  Kubernetes Fundamentals46%- Scheduling and Administration
                  • 1. Basic kubectl operations
                    • 2. Scheduler concepts
                      - Containerization Basics
                      • 1. Containers vs VMs
                        • 2. Images and registries
                          - Kubernetes Core Concepts
                          • 1. Cluster architecture and components
                            • 2. Pods, Controllers, Services
                              • 3. API resources and objects
                                Cloud Native Application Delivery8%- Deployment Strategies
                                • 1. Application lifecycle management
                                  • 2. Rolling updates, canary releases
                                    - Delivery Models
                                    • 1. CI/CD pipelines
                                      • 2. GitOps principles
                                        Container Orchestration22%- Orchestration Principles
                                        • 1. Runtime environments
                                          • 2. Why orchestration matters
                                            - Networking & Storage
                                            • 1. Persistent storage concepts
                                              • 2. Cluster networking model
                                                - Security & Troubleshooting
                                                • 1. Security fundamentals
                                                  • 2. Basic troubleshooting methods

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                                                    Linux Foundation Kubernetes and Cloud Native Associate Sample Questions (Q253-Q258):

                                                    NEW QUESTION # 253
                                                    Which Kubernetes feature is the simplest way to force a Pod or Deployment to run only on nodes with a specific label?

                                                    Answer: C

                                                    Explanation:
                                                    A nodeSelector directly matches Pod scheduling to nodes with specific labels, providing the simplest and most straightforward way to constrain where Pods run.


                                                    NEW QUESTION # 254
                                                    You are running a service in Kubernetes that uses a persistent volume. You need to ensure that the volume is automatically cleaned up when the service is deleted. Which of the following approaches would you use?

                                                    Answer: A

                                                    Explanation:
                                                    Setting the 'persistentVolumeReclaimPolicy' to 'Delete' in the PersistentVolumeClaim ensures that the volume is automatically deleted when the PVC is deleted. This is the most straightforward and recommended approach for cleaning up persistent volumes in Kubernetes.


                                                    NEW QUESTION # 255
                                                    You are using a Kubernetes deployment to run a web application. You want to roll out a new version of the application with minimal downtime. Which strategy can be used to achieve this?

                                                    Answer: A,B,C

                                                    Explanation:
                                                    RollingUpdate, BlueGreen, and Canary are all strategies that can be used to roll out new application versions with minimal downtime. RollingUpdate updates Pods one by one, ensuring that there are always healthy Pods running. BlueGreen creates two separate environments, one for the old version and one for the new version, and then switches traffic over to the new environment. Canary gradually rolls out the new version to a small subset of users before making it available to everyone. Option 'A' (Recreate) would completely stop the old Pods before creating new ones, which could lead to downtime. Option 'E' (Immutable) is not a deployment strategy for rolling out updates.


                                                    NEW QUESTION # 256
                                                    Which is not a service type in Kubernetes?

                                                    Answer: D

                                                    Explanation:
                                                    https://kubernetes.io/docs/tutorials/kubernetes-basics/expose/expose-intro/


                                                    NEW QUESTION # 257
                                                    Which of the following sentences is true about namespaces in Kubernetes?

                                                    Answer: D

                                                    Explanation:
                                                    The true statement is C: the default namespace exists when a new cluster is created. Namespaces are a Kubernetes mechanism for partitioning cluster resources into logical groups. When you set up a cluster, Kubernetes creates some initial namespaces (including default, and commonly kube-system, kube-public, and kube-node-lease). The default namespace is where resources go if you don't specify a namespace explicitly.
                                                    Option A is false because namespaces are not hierarchical; Kubernetes does not support "namespaces inside namespaces." Option B is false because within a given namespace, resource names must be unique per resource kind. You can't have two Deployments with the same name in the same namespace. You can have a Deployment named web in one namespace and another Deployment named web in a different namespace- namespaces provide that scope boundary. Option D is false because not all objects are namespaced. Many resources are cluster-scoped (for example, Nodes, PersistentVolumes, ClusterRoles, ClusterRoleBindings, and StorageClasses). Namespaces apply only to namespaced resources.
                                                    Operationally, namespaces support multi-tenancy and environment separation (dev/test/prod), RBAC scoping, resource quotas, and policy boundaries. For example, you can grant a team access only to their namespace and enforce quotas that prevent them from consuming excessive CPU/memory. Namespaces also make organization and cleanup easier: deleting a namespace removes most namespaced resources inside it (subject to finalizers).
                                                    So, the verified correct statement is C: the default namespace exists upon cluster creation.
                                                    =========


                                                    NEW QUESTION # 258
                                                    ......

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