JN0-214認証試験の問題集解答を提供しています [2024年12月]
更新されたJN0-214試験練習テスト問題
質問 # 29
Which two statements about overlay virtual networks are true? (Choose two.)
- A. Overlay virtual networks use Juniper proprietary protocols.
- B. Overlay virtual networks allow both Layer 2 and Layer 3 communication.
- C. Overlay virtual networks only allow Layer 3 communication.
- D. Overlay virtual networks work well on an IP spine-and-leaf topology.
正解：B、D
解説：
Overlay virtual networks are virtual logical networks constructed on top of an existing network using network virtualization technologies. They decouple network services from the physical networking and interconnection technologies on the underlay network. Two true statements about overlay virtual networks are:
Overlay virtual networks work well on an IP spine-and-leaf topology. They can be created over underlay networks using network virtualization technologies.
Overlay virtual networks allow both Layer 2 and Layer 3 communication. They can serve not only different services (such as multiple departments) of the same tenant but also different tenants.
質問 # 30
You are asked to run a container in a Kubernetes environment.
What should you do to accomplish this task?
- A. Define a YAML manifest for the container and its resources.
- B. Create a WYSYG definition for the container and its resources.
- C. Create a JINJA2 template for the container and its resources.
- D. Define an XML configuration for the container and its resources.
正解：A
解説：
To run a container in a Kubernetes environment, you should define a YAML manifest for the container and its resources. YAML manifests are used to define Kubernetes objects, such as pods or services. These manifests describe the desired state of the system.
質問 # 31
Click the Exhibit button.
Referring to the exhibit, what does port: 8080 represent?
- A. It is the port that is exposed to clients that are external to the cluster.
- B. It is the port that is used by the external load balancer.
- C. It is the port that is exposed to clients that are internal to the cluster.
- D. It is the port on which the webapp pod is listening.
正解：C
解説：
In the context of a Kubernetes service, port: 8080 represents the port that is exposed to clients that are internal to the cluster. This is the stable port the Service exposes inside the cluster -- other Pods in the cluster send traffic to this port.
質問 # 32
Click the Exhibit button.
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The myvSRX instance is using a default image.
- B. The c using a custom flavor.
- C. The myvSRX instance is part of a default network.
- D. The myvSRX instance is currently running.
正解：B、D
解説：
Based on the image description provided, the instance named 'myvSRX' appears to be using a custom flavor (not default) and is currently in an 'ACTIVE' state, which means it is running.
質問 # 33
Your organization has legacy virtual machine workloads that need to be managed within a Kubernetes deployment.
Which Kubernetes add-on would be used to satisfy this requirement?
- A. Romana
- B. ADOT
- C. KubeVirt
- D. Canal
正解：C
解説：
KubeVirt is a Kubernetes add-on that allows you to run and manage legacy virtual machine workloads alongside container workloads within a Kubernetes deployment. According to the KubeVirt website, KubeVirt is "a virtual machine management add-on for Kubernetes" that "aims to provide a common ground for virtualization solutions on top of Kubernetes". Other Kubernetes add- ons that are mentioned in the question are Canal, which is a network policy provider that combines Flannel and Calico; ADOT, which is a distribution of the OpenTelemetry Collector that supports tracing and metrics collection for AWS services; and Romana, which is a network and security automation solution that supports multiple network topologies and policies.
質問 # 34
Juniper Cloud-Native Contrail Networking (CN2) is able to be integrated with which orchestrator?
- A. Kubernetes
- B. Mesosphere
- C. CloudStack
- D. Marathon
正解：A
解説：
Juniper Cloud-Native Contrail Networking (CN2) can be integrated with Kubernetes. CN2 is optimized for Kubernetes-orchestrated environments and can be used to connect, isolate, and secure cloud workloads and services seamlessly across private, public, and hybrid clouds.
質問 # 35
You are provisioning workloads on worker nodes in a Kubernetes cluster.
Which CN2 component is responsible for generating associated routes?
- A. Contrail kube-manager
- B. vRouter agent microservice
- C. Configuration Resource (CR) controllers
- D. vRouter forwarding plane
正解：B
解説：
The vRouter agent microservice is the CN2 component responsible for generating associated routes. When a pod is scheduled on a node, the vRouter agent on that node programs the necessary routes in the kernel routing table to ensure that traffic destined for that pod is properly routed.
質問 # 36
What is an OpenShift route?
- A. It allows pods to communicate across clusters.
- B. It provisions endpoints for a service.
- C. It provisions external access to a service.
- D. It allows pods to communicate across namespaces.
正解：C
解説：
An OpenShift route is a way to provision external access to a service. A route exposes a service at a host name, such as www.example.com, that external clients can use to access the service. A route can also specify security options, such as TLS termination, and load balancing options, such as round robin or least connection.
質問 # 37
Which component of an SDN architecture is responsible for configuring and maintaining devices and their state?
- A. the forwarding plane
- B. the data plane
- C. the management plane
- D. the operational plane
正解：C
解説：
The management plane in an SDN architecture is responsible for configuring and maintaining devices and their state. It provides the functions that manage the network, such as configuration, monitoring, and management of network devices. It is the layer of the network that carries administrative traffic, which is used for the network management.
質問 # 38
Which two statements are correct about containers? (Choose two.)
- A. Containers have faster boot times than VMs. www*
- B. Containers include the entire operating system.
- C. Containers require an underlying operating system.
- D. Containers reduce deployment efficiency.
正解：A、C
解説：
Containers are lightweight because they don't need the extra load of a hypervisor, but run directly within the host machine's kernel. This means they start up almost instantly and use less RAM.
Images are constructed from layered filesystems and share common files, making disk usage and image downloads much more efficient. Containers are isolated from each other and the host system. They have their own filesystem and networking, and can be constrained to not allow root access outside the container. They run on top of a host operating system.
質問 # 39
The Kubernetes object definition file is in which format?
- A. TXT
- B. IXML
- C. YAML
- D. HTML
正解：C
解説：
The Kubernetes object definition file is in YAML format. Kubernetes objects are represented in the Kubernetes API, and you can express them in .yaml format. You can execute kubectl get deployment <deployment-name> -o yaml to get the deployment definition in a yaml format.
質問 # 40
What are two available installation methods for an OpenShift cluster? (Choose two.)
- A. installer-provisioned infrastructure
- B. kubesprav
- C. kubeadm
- D. user-provisioned infrastructure
正解：A、D
解説：
There are two available installation methods for an OpenShift cluster. One is the installer- provisioned infrastructure method, and the other is the user-provisioned infrastructure method.
質問 # 41
Which two features are provided by CN2? (Choose two.)
- A. isolated namespaces
- B. user-defined virtual networks
- C. application firewall
- D. role-based access control
正解：A、B
解説：
According to the CN2 datasheet, CN2 supports "multiple isolated namespaces for each tenant, allowing for overlapping IP addresses among tenants" and "user-defined virtual networks that can span across clusters, regions, and clouds". Other features of CN2 include cloud-native networking, NetOps-driven automation, edge and remote compute, enhanced observability, and ultra-fast, high performance.
質問 # 42
You are deploying CN2 using Kubernetes as your orchestrator.
In this scenario, which component contains the vRouter agent?
- A. kube-manager
- B. worker node
- C. Ikube-scheduler
- D. Contrail controller
正解：B
解説：
In a CN2 deployment using Kubernetes as the orchestrator, the vRouter agent is contained in the worker node. The vRouter agent is responsible for managing the forwarding plane on each node in a Contrail cluster. It interacts with the kernel to manage the services and interfaces within the virtual networks.
質問 # 43
Which virtualization technique is used by containers?
- A. hardware-assisted virtualization
- B. OS-level virtualization
- C. paravirtualization
- D. full visualization
正解：B
解説：
This technique allows multiple isolated user-space instances to be created by the host operating system. Unlike full virtualization, where the entire system's hardware is emulated, OS-level virtualization shares the host's operating system kernel but isolates the application processes.
質問 # 44
Your business has optimized its applications to leverage a cloud-native microservices-based architecture.
In this architecture, how do the various modules of an application communicate?
- A. Application modules communicate through remote direct memory access
- B. Application modules communicate through interprocess communication
- C. Application modules communicate through shared data structures (DB/files).
- D. Application modules communicate through application programming interface (API) calls.
正解：D
解説：
In a cloud-native microservices-based architecture, the various modules of an application communicate through application programming interface (API) calls. Each service is autonomous and self-contained and runs a unique process.
質問 # 45
Which two statements are true about virtual networks? (Choose two.)
- A. Virtual networks are available on common Linux distributions.
- B. Virtual networks are available only as part of a cloud orchestration system.
- C. Virtual networks are able to span multiple devices.
- D. Virtual networks are limited to a single device.
正解：A、C
解説：
Virtual networks are logical networks that are decoupled from the underlying network hardware.
This decoupling allows network administrators to manage their networks independently of the physical network topology. As such, virtual networks can span multiple devices, allowing for a high degree of flexibility and scalability. Furthermore, virtual networks are available on common Linux distributions, allowing for easy deployment and management.
質問 # 46
Which virtualization method requires less duplication of hardware resources?
- A. full virtualization
- B. hardware-assisted virtualization
- C. OS-level virtualization
- D. paravirtualization
正解：C
解説：
OS-level virtualization requires less duplication of hardware resources. This method allows multiple instances of an operating system or multiple different operating systems to run on a single physical server, sharing the same hardware resources. This results in more efficient use of hardware resources compared to other virtualization methods such as full virtualization or paravirtualization.
質問 # 47
Which two Linux commands would you use to show the amount of RAM in your system? (Choose two.)
- A. free -h
- B. cat /proc/meminto
- C. df -h
- D. cat /proc/cpuinfo
正解：A、B
解説：
he free -h command in Linux displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel. The cat /proc/meminfo command displays real-time information about the system's memory usage as well as the buffers and shared memory used by the kernel.
質問 # 48
Which component of Kubernetes runs on all nodes and ensures that the containers are running in a pod?
- A. kubelel
- B. kube controller
- C. container runtime
- D. kube-proxy
正解：A
解説：
The kubelet is a component of Kubernetes that runs on all nodes in the cluster and ensures that containers are running in a pod. It takes a set of PodSpecs that are provided through various mechanisms and ensures that the containers described in those PodSpecs are running and healthy.
質問 # 49
What is the networking service of OpenStack?
- A. Heat
- B. Neutron
- C. Barbican
- D. ironic
正解：B
解説：
OpenStack's networking service is known as Neutron. Neutron provides a scalable, API-driven, web services-based model for network connectivity as a service. It is designed to manage and configure networking services for both simple and complex network topologies. Neutron allows users to create their own networks, control traffic and connect servers and devices to one or multiple networks.
質問 # 50
Which two tools are used to deploy a Kubernetes environment for testing and development purposes? (Choose two.)
- A. minikube
- B. OpenStack
- C. oc
- D. kind
正解：A、D
解説：
Minikube and kind are two tools that are commonly used to deploy a Kubernetes environment for testing and development purposes.
質問 # 51
You have started a container in Docker, made configuration changes to it, and stopped the container. You notice the next time that you execute the docker run command, the changes have not persisted.
What is the problem?
- A. Docker images need to be recompiled to make any changes.
- B. The docker exec command needs to be run first to save and exit the running container.
- C. The docker load command must be used to persist the change.
- D. The docker run command starts a new copy of the container, not the existing version.
正解：D
解説：
Docker containers are designed to be ephemeral, meaning they run based on their current configuration. When a Docker container is stopped, it does not automatically save changes made during its runtime. When you execute docker run, it starts a new instance of the container, not an existing version with its changes. If you want to persist changes between runs, you need to commit changes to a new Docker image or use Docker volumes for data persistence.
質問 # 52
Which two statements about Kubernetes are correct? (Choose two.)
- A. A ClusterlP service exposes pods to internal traffic only.
- B. A ClusterlP service exposes pods to internal and external traffic.
- C. Each container within a pod has a unique IP address.
- D. All containers within a pod share the same IP address.
正解：A、D
解説：
In Kubernetes, all containers within a pod share the same IP address. A ClusterIP service exposes pods to internal traffic only.
質問 # 53
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