KCNA practice questions 61–70

1. Question 61 · 282 in bank

   The Kubernetes project work is carried primarily by SIGs. What does SIG stand for?

   • ASpecial Interest Group
   • BSoftware Installation Guide
   • CSupport and Information Group
   • DStrategy Implementation Group

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   Answer: A

   Explanation

   A. Special Interest Group Explanation: SIG stands for Special Interest Group. In the context of Kubernetes, SIGs are groups of contributors focused on specific areas or domains within the project. Each SIG is responsible for overseeing and contributing to the development, maintenance, and improvement of its designated area, such as networking, storage, scalability, or documentation. An analogy for SIGs could be departments within an organization. In a company, different departments (such as marketing, sales, or engineering) focus on specific areas of expertise and collaborate to achieve common goals. Similarly, SIGs in Kubernetes focus on specific aspects of the project and work together to advance the development and functionality of those areas.

   Source: Adapted from community discussion — phcunha

   References

   • cncf.io documentation

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2. Question 62 · 282 in bank

   What is the order of 4C’s in Cloud Native Security, starting with the layer that a user has the most control over?

   • ACloud -> Container -> Cluster -> Code
   • BContainer -> Cluster -> Code -> Cloud
   • CCluster -> Container -> Code -> Cloud
   • DCode -> Container -> Cluster -> Cloud

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   Answer: D

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3. Question 63 · 282 in bank

   Which group of container runtimes provides additional sandboxed isolation and elevated security?

   • Arune, cgroups
   • Bdocker, containerd
   • Crunsc, kata
   • Dcrun, cri-o

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   Answer: C

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4. Question 64 · 282 in bank

   What is the common standard for Service Meshes?

   • AService Mesh Specification (SMS)
   • BService Mesh Technology (SMT)
   • CService Mesh Interface (SMI)
   • DService Mesh Function (SMF)

   Show answer

   Answer: C

   Explanation

   C. Service Mesh Interface (SMI) Explanation: The Service Mesh Interface (SMI) is a specification for implementing service mesh functionality across different service mesh implementations. It provides a standard set of APIs for controlling and observing service mesh behavior, allowing for interoperability between various service mesh solutions. An analogy for SMI could be a universal remote control standard. Just as different electronic devices from different manufacturers can be controlled using a universal remote that adheres to a common standard, service mesh implementations can communicate and interoperate effectively using the Service Mesh Interface (SMI) specification.

   Source: Adapted from community discussion — phcunha

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5. Question 65 · 282 in bank

   Which statement about Ingress is correct?

   • AIngress provides a simple way to track network endpoints within a cluster.
   • BIngress is a Service type like NodePort and ClusterIP.
   • CIngress is a construct that allows you to specify how a Pod is allowed to communicate.
   • DIngress exposes routes from outside the cluster to services in the cluster.

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   Answer: D

   Explanation

   D. Ingress exposes routes from outside the cluster to services in the cluster. Explanation: Ingress in Kubernetes is an API object that manages external access to services within a cluster. It provides HTTP and HTTPS routing to services based on incoming requests' hostnames, paths, or other criteria. Ingress exposes routes from outside the cluster to services inside the cluster, acting as an entry point for external traffic to reach services. An analogy for Ingress could be a building's main entrance gate. Just as a main entrance gate controls access to different sections or floors within a building, Ingress controls access to different services within a Kubernetes cluster based on defined routing rules.

   Source: Adapted from community discussion — phcunha

   References

   • Kubernetes documentation

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6. Question 66 · 282 in bank

   A CronJob is scheduled to run by a user every one hour. What happens in the cluster when it's time for this CronJob to run?

   • AKubelet watches API Server for CronJob objects. When it's time for a Job to run, it runs the Pod directly.
   • BKube-scheduler watches API Server for CronJob objects, and this is why it's called kube-scheduler.
   • CCronJob controller component creates a Pod and waits until it finishes to run.
   • DCronJob controller component creates a Job. Then the Job controller creates a Pod and waits until it finishes to run.

   Show answer

   Answer: D

   Explanation

   CronJob Controller: The CronJob controller is responsible for managing CronJobs. It schedules Jobs based on the CronJob's schedule (e.g., every hour). Job Creation: When it's time for a CronJob to run, the CronJob controller creates a Job resource. This Job represents the workload that needs to be executed. Job Controller: Once the Job is created, the Job controller is responsible for managing this Job. It ensures that the Pods specified by the Job are created and completed successfully. Pod Execution: The Job controller creates one or more Pods based on the Job specification. These Pods execute the tasks defined by the Job. The Job controller waits until the Pod(s) complete their execution.

   Source: Adapted from community discussion — Saireddybonthu

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7. Question 67 · 282 in bank

   What best describes cloud native service discovery?

   • AIt's a mechanism for applications and microservices to locate each other on a network.
   • BIt's a procedure for discovering a MAC address, associated with a given IP address.
   • CIt's used for automatically assigning IP addresses to devices connected to the network.
   • DIt's a protocol that turns human-readable domain names into IP addresses on the Internet.

   Show answer

   Answer: A

   Explanation

   A. It's a mechanism for applications and microservices to locate each other on a network. Explanation: Cloud native service discovery is a crucial aspect of distributed systems architecture, particularly in microservices environments. It enables applications and microservices to dynamically discover and communicate with each other without hardcoding IP addresses or relying on static configurations. This mechanism allows services to be scalable, resilient, and loosely coupled, facilitating efficient communication and interaction within the cloud environment. An analogy for service discovery could be a directory in a large office building. Just as a directory helps individuals find the locations of various offices or departments within a building, service discovery enables components within a distributed system to locate and communicate with each other dynamically, regardless of their specific network locations or configurations.

   Source: Adapted from community discussion — phcunha

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8. Question 68 · 282 in bank

   What components are common in a service mesh?

   • Atracing and log storage
   • Bcircuit breaking and Pod scheduling
   • Cdata plane and runtime plane
   • Dservice proxy and control plane

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   Answer: D

   Explanation

   In a service mesh architecture, service proxies (such as Envoy, Linkerd proxy, or Istio sidecar) are deployed alongside each service instance to handle communication between services. The control plane consists of various components responsible for configuring, managing, and monitoring the behavior of the service proxies, including features like traffic routing, load balancing, encryption, authentication, and observability. Together, these components enable advanced traffic management, security, and observability capabilities in a distributed microservices environment.

   Source: Adapted from community discussion — EzBL

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9. Question 69 · 282 in bank

   Which storage operator in Kubernetes can help the system to self-scale, self-heal, etc?

   • ARook
   • BKubernetes
   • CHelm
   • DContainer Storage Interface (CSI)

   Show answer

   Answer: A

   Explanation

   Rook provides features like self-scaling, self-healing, monitoring, and automation of storage management tasks. It abstracts the complexities of managing distributed storage systems and integrates them seamlessly with Kubernetes, enabling operators to deploy and manage storage clusters as easily as deploying other Kubernetes resources.

   Source: Adapted from community discussion — dadaarce

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10. Question 70 · 282 in bank

    What fields must exist in any Kubernetes object (e.g. YAML) file?

    • AapiVersion, kind, metadata
    • Bkind, namespace, data
    • CapiVersion, metadata, namespace
    • Dkind, metadata, data

    Show answer

    Answer: A

    Explanation

    A. apiVersion, kind, metadata Explanation: In any Kubernetes object definition file, there are three mandatory fields that must exist: apiVersion: Specifies the version of the Kubernetes API that the object uses. This field ensures compatibility and defines the structure of the object. kind: Specifies the type of Kubernetes object being defined, such as Pod, Service, Deployment, etc. This field determines the behavior and functionality of the object. metadata: Contains metadata about the object, such as its name, namespace, labels, and annotations. This metadata is used by Kubernetes to identify and manage the object within the cluster. These fields are essential for Kubernetes to interpret and process the object correctly. The other options do not include all three mandatory fields or contain fields that are not universally required in every Kubernetes object.

    Source: Adapted from community discussion — phcunha

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KCNA practice, question 61. 282 questions available.