更新された2024年04月テストエンジン練習JN0-213問題集と練習試験合格させます
問題集お試しセットJN0-213テストエンジンで問題集トレーニングには67問あります
質問 # 30
Click the Exhibit button.
Referring to the exhibit, which statement is correct?
- A. There are no services.
- B. There are no compute nodes.
- C. There are no virtual machines.
- D. There are no projects.
正解：C
解説：
Explanation
The correct answer is D. There are no virtual machines. Referring to the exhibit, which shows the output of the openstack server list command, we can see that there are no rows in the table, which means that there are no servers (or virtual machines) in the OpenStack environment. The command openstack server list is used to list servers that you can access1. The other statements are incorrect, because the exhibit does not show any information about projects, services, or compute nodes. To list projects, you would use the command openstack project list2. To list services, you would use the command openstack service list2. To list compute nodes, you would use the command openstack compute service list3.
質問 # 31
You want to limit the memory, CPU, and network utilization of a set of processes running on a Linux host.
Which Linux feature would you configure in this scenario?
- A. network namespaces
- B. control groups
- C. virtual routing and forwarding instances
- D. slicing
正解：B
解説：
Explanation
Control groups (cgroups) is a Linux kernel feature that limits, accounts for, and isolates the CPU, memory, disk I/O, and network usage of one or more processes678. It allows you to allocate resources among user-defined groups of processes running on a system. You can monitor the groups of processes, deny the groups of processes access to certain resources, or even freeze groups of processes
質問 # 32
Which two statements are true about virtual networks? (Choose two.)
- A. Virtual networks are able to span multiple devices.
- B. Virtual networks are available on common Linux distributions.
- C. Virtual networks are limited to a single device.
- D. Virtual networks are available only as part of a cloud orchestration system.
正解：A、B
解説：
Explanation
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 # 33
Which two tools are used to deploy a Kubernetes environment for testing and development purposes? (Choose two.)
- A. oc
- B. minikube
- C. kind
- D. OpenStack
正解：B、C
解説：
Explanation
Minikube and kind are two tools that are commonly used to deploy a Kubernetes environment for testing and development purposes3
質問 # 34
Which component of a software-defined networking (SDN) controller defines where data packets are forwarded by a network device?
- A. the control plane
- B. the forwarding plane
C the management plane - C. the operational plane
正解：B
解説：
Explanation
The forwarding plane (also known as the data plane) of a software-defined networking (SDN) controller is responsible for forwarding data packets based on the instructions given by the control plane23. It handles all activities involving data packets sent by the end-user, including forwarding of packets2. References from Juniper site: GeeksforGeeks, SDxCentral
質問 # 35
The Kubernetes object definition file is in which format?
- A. YAML
- B. HTML
- C. TXT
- D. IXML
正解：A
解説：
Explanation
The Kubernetes object definition file is in YAML format789. Kubernetes objects are represented in the Kubernetes API, and you can express them in .yaml format7. You can execute kubectl get deployment
<deployment-name> -o yaml to get the deployment definition in a yaml format8.
質問 # 36
Which two statements are true regarding isolated namespaces in Juniper Cloud-Native Contrail Networking (CN2)? (Choose two.)
- A. Pods in isolated namespaces can reach services in non-isolated namespaces.
- B. Pods in isolated namespaces can only reach services in the same namespace.
- C. Pods in isolated namespaces can communicate with pods in non-isolated namespaces.
- D. Pods in isolated namespaces can only communicate with pods in the same namespace.
正解：B、D
解説：
Explanation
In Juniper Cloud-Native Contrail Networking (CN2), isolated namespaces are used to isolate a pod from other pods without explicitly configuring a network policy3. Pods in an isolated namespace can only communicate with pods in the same namespace3. They cannot reach pods or services in other isolated or non-isolated namespaces3.
質問 # 37
Which two statements are correct about OpenShift monitoring? (Choose two.)
- A. OpenShifmonitoring is not compatible with Grafana.
- B. OpenShifhas its own monitoring framework.
- C. OpenShifis able to configure customized alerts.
- D. OpenShifis not able to configure customized alerts.
正解：B、C
解説：
Explanation
OpenShift includes a preconfigured, preinstalled, and self-updating monitoring stack that provides monitoring for core platform components4. You also have the option to enable monitoring for user-defined projects4. This means OpenShift has its own monitoring framework (B) and is able to configure customized alerts (D).
References from Juniper site: OpenShift Container Platform
質問 # 38
What are two Kubernetes objects? (Choose two.)
- A. pod
- B. cluster
- C. namespace
- D. service
正解：A、D
解説：
Explanation
In Kubernetes, a Pod is the smallest and simplest unit in the Kubernetes object model that you create or deploy23. A Pod represents processes running on your cluster23. A Service in Kubernetes is an abstraction which defines a logical set of Pods and a policy by which to access them23.
質問 # 39
You are asked to run a container in a Kubernetes environment.
What should you do to accomplish this task?
- A. Create a WYSYG definition for the container and its resources.
- B. Define a YAML manifest for the container and its resources.
- C. Define an XML configuration for the container and its resources.
- D. Create a JINJA2 template for the container and its resources.
正解：B
解説：
Explanation
To run a container in a Kubernetes environment, you should define a YAML manifest for the container and its resources2. YAML manifests are used to define Kubernetes objects, such as pods or services. These manifests describe the desired state of the system2.
質問 # 40
Click the Exhibit button.
Referring to the exhibit, which two statements are correct? (Choose two.)
- A. The c using a custom flavor.
- B. The myvSRX instance is part of a default network.
- C. The myvSRX instance is using a default image.
- D. The myvSRX instance is currently running.
正解：A、D
解説：
Explanation
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 # 41
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. The docker exec command needs to be run first to save and exit the running container.
- B. The docker run command starts a new copy of the container, not the existing version.
- C. Docker images need to be recompiled to make any changes.
- D. The docker load command must be used to persist the change.
正解：B
解説：
Explanation
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[14-16]. 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[14-16]. References from Juniper site: Stack Overflow, Docker Docs
質問 # 42
You want to view pods with their IP addresses in OpenShift.
Which command would you use to accomplish this task?
- A. oc get pods -o yaml
- B. oc get pods -o wide
- C. oc get pods
- D. oc get all
正解：B
解説：
Explanation
To view pods with their IP addresses in OpenShift, you would use the command oc get pods -o wide23. This command provides additional information such as the IP address and the node where the pod is located23.
References from Juniper site: OpenShift Documentation, Stack Overflow
質問 # 43
The openstack user list command uses which OpenStack service?
- A. Nova
- B. Cinder
- C. Neutron
- D. Keystone
正解：D
解説：
Explanation
The openstack user list command uses the Keystone service, which is the identity service for OpenStack.
Keystone provides authentication, authorization, and service discovery for OpenStack. It also manages projects, users, roles, and endpoints for the OpenStack services
質問 # 44
Which two statements are correct about containers? (Choose two.)
- A. Containers have faster boot times than VMs. www*
- B. Containers require an underlying operating system.
- C. Containers reduce deployment efficiency.
- D. Containers include the entire operating system.
正解：A、B
解説：
Explanation
Containers are lightweight because they don't need the extra load of a hypervisor, but run directly within the host machine's kernel1. 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 efficient1. 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 container1. They run on top of a host operating system1.
質問 # 45
Which two statements are correct about Kubernetes resources? (Choose two.)
- A. A daemonSet ensures that a replica of a pod is running on all nodes.
- B. A ClusterIP type service can only be accessed within a Kubernetes cluster.
- C. NodePort service exposes the service externally by using a cloud provider load balancer.
- D. A deploymentConfig is a Kubernetes resource.
正解：A、B
解説：
Explanation
A daemonSet in Kubernetes ensures that a replica of a pod is running on all nodes3. A ClusterIP type service can only be accessed within a Kubernetes cluster3. References from Juniper site: Kubernetes Documentation
質問 # 46
Which two statements are correct about Network Functions Virtualization (NFV)? (Choose two.)
- A. The NFV infrastructure (NFVI) is not a component of NFV.
- B. The NFV infrastructure (NFVI) is a component of NFV.
- C. The NFV framework explains how VNFs fits into the whole solution.
- D. The NFV framework is defined by the W3C.
正解：B、C
解説：
Explanation
Network Functions Virtualization (NFV) is a network architecture concept that uses IT virtualization technologies to virtualize entire classes of network node functions into building blocks that may connect or chain together to create communication services3. The NFV framework explains how Virtual Network Functions (VNFs) fit into the whole solution4. The NFV Infrastructure (NFVI) is a component of NFV that consists of the infrastructure components -compute, storage, networking-on a platform to support software4. References from Juniper site: Red Hat, VMware, Wikipedia
質問 # 47
What are the two characteristics of the Network Functions Virtualization (NFV) framework? (Choose two.)
- A. It implements virtualized network functions
- B. It decouples the network control plane from the forwarding plane.
- C. It decouples the network software from the hardware.
- D. It implements virtualized tunnel endpoints.
正解：A、C
解説：
Explanation
The two characteristics of the Network Functions Virtualization (NFV) framework are that it implements virtualized network functions (VNFs) and that it decouples the network software from the hardware. According to the NFV overview by VMware3, NFV is "designed to deliver the network services needed to support an infrastructure totally independent from hardware by decoupling network functions from proprietary purpose-built hardware appliances" and that "the software that provides these network services are known as virtual network functions (VNFs) and run on generic hardware". Other characteristics that are mentioned in the question are related to Software Defined Networking (SDN), not NFV. SDN separates the network control plane from the forwarding plane and implements virtualized tunnel endpoints.
質問 # 48
Which virtualization method requires less duplication of hardware resources?
- A. OS-level virtualization
- B. full virtualization
- C. hardware-assisted virtualization
- D. paravirtualization
正解：A
解説：
Explanation
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 # 49
Which two statements about overlay virtual networks are true? (Choose two.)
- A. Overlay virtual networks allow both Layer 2 and Layer 3 communication.
- B. Overlay virtual networks use Juniper proprietary protocols.
- C. Overlay virtual networks only allow Layer 3 communication.
- D. Overlay virtual networks work well on an IP spine-and-leaf topology.
正解：A、D
解説：
Explanation
Overlay virtual networks are virtual logical networks constructed on top of an existing network using network virtualization technologies45. They decouple network services from the physical networking and interconnection technologies on the underlay network45. Two true statements about overlay virtual networks are:
Overlay virtual networks work well on an IP spine-and-leaf topology6. They can be created over underlay networks using network virtualization technologies4.
Overlay virtual networks allow both Layer 2 and Layer 3 communication65. They can serve not only different services (such as multiple departments) of the same tenant but also different tenants4.
References from Juniper site: Microsoft Learn, Huawei IP Encyclopedia, Network Insight
質問 # 50
Which cloud service model provides access to networking, storage, servers, and virtualization in a cloud environment?
- A. Infrastructure as a Service (laaS)
- B. Database as a Service (Daa)
- C. Platform as a Service (Paa)
- D. Software as a Service (Saa)
正解：A
解説：
Explanation
Infrastructure as a Service (IaaS) is a cloud service model that provides access to networking, storage, servers, and virtualization in a cloud environment91011. References from Juniper site: IBM, Google Cloud, Stackscale
質問 # 51
In the CN2 architecture, which component integrates with the orchestrator to listen for changes and take action on any events affecting network resources?
- A. contrail-vrouter-agent
- B. cni.bin
- C. contrail-k8s-kubemanaqer
- D. kube-a pi server
正解：C
解説：
Explanation
contrail-k8s-kubemanager is the component in the CN2 architecture that integrates with the orchestrator (such as Kubernetes or OpenShift) to listen for changes and take action on any events affecting network resources. According to the CN2 components documentation2, contrail-k8s-kubemanager is "the interface between Kubernetes resources and Contrail resources" that "watches the kube-apiserver for changes to regular Kubernetes resources such as service and namespace and acts on any changes that affect the networking resources". Other components in the CN2 architecture are contrail-k8s-apiserver2, which is an aggregated API server that manages all Contrail resources; cni.bin, which is a binary file that implements the Container Network Interface (CNI) specification for CN2; and contrail-vrouter-agent, which is a pod that runs on every node and communicates with the CN2 control plane to program the data plane.
質問 # 52
Which OpenStack service provides API client authentication?
- A. Nova
- B. Neutron
- C. iHeat
- D. Keystone
正解：D
解説：
Explanation
Keystone is an OpenStack service that provides API client authentication3456. It provides API client authentication, service discovery, and distributed multi-tenant authorization by implementing OpenStack's Identity API
質問 # 53
Which component of Kubernetes runs on all nodes and ensures that the containers are running in a pod?
- A. container runtime
- B. kube controller
- C. kube-proxy
- D. kubelel
正解：D
解説：
Explanation
The kubelet is a component of Kubernetes that runs on all nodes in the cluster and ensures that containers are running in a pod910. 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 # 54
Which Docker component builds, runs, and distributes Docker containers?
- A. dockerd
- B. docker cli
- C. docker registry
- D. containerd
正解：A
解説：
Explanation
The Docker component that builds, runs, and distributes Docker containers is dockerd. Dockerd is the persistent process that manages containers. Docker uses different binaries for different tasks. For example, it uses the docker binary for CLI commands and dockerd for the daemon process.
質問 # 55
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