あなたを合格させるJN0-213試験問題集で使おう（更新された67問があります)
JN0-213試験問題集でJuniper練習テスト問題
JN0-213 試験は、クラウドネットワーク分野でキャリアをスタートさせたい個人や、この分野でのスキルと知識を高めたいプロフェッショナルにとって、優れた認定試験です。この認定試験は、業界で高く評価され、競争の激しい求人市場で差別化を図ることができます。
質問 # 17
The openstack user list command uses which OpenStack service?
- A. Nova
- B. Neutron
- C. Cinder
- 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 # 18
Which two statements are correct about containers? (Choose two.)
- A. Containers reduce deployment efficiency.
- B. Containers have faster boot times than VMs. www*
- C. Containers include the entire operating system.
- D. Containers require an underlying operating system.
正解：B、D
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 # 19
Which cloud service model provides access to networking, storage, servers, and virtualization in a cloud environment?
- A. Database as a Service (Daa)
- B. Platform as a Service (Paa)
- C. Infrastructure as a Service (laaS)
- D. Software as a Service (Saa)
正解：C
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 # 20
What are two Kubernetes objects? (Choose two.)
- A. cluster
- B. pod
- C. namespace
- D. service
正解：B、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 # 21
What are two available installation methods for an OpenShift cluster? (Choose two.)
- A. user-provisioned infrastructure
- B. installer-provisioned infrastructure
- C. kubesprav
- D. kubeadm
正解：A、B
解説：
Explanation
There are two available installation methods for an OpenShift cluster. One is the installer-provisioned infrastructure method56, and the other is the user-provisioned infrastructure method56. References from Juniper site: VMware NSX Container Plugin, OpenShift Container Platform 4.10 Documentation
質問 # 22
Which CN2 component provides the network control plane capability?
- A. contrail-k8s-controller
- B. contrail-control
- C. contrail-vrouter-nodes
- D. contrail-k8s-kubemanaqer
正解：B
解説：
Explanation
The network control plane in CN2 represents CN2's full-featured SDN capability. It communicates with other controllers and uses XMPP to communicate with the distributed data plane components on the worker nodes6.
References from Juniper site: Juniper Networks
質問 # 23
Click the Exhibit button.
Referring to the exhibit, what does port: 8080 represent?
- A. It is the port on which the webapp pod is listening.
- B. It is the port that is exposed to clients that are internal to the cluster.
- C. It is the port that is used by the external load balancer.
- D. It is the port that is exposed to clients that are external to the cluster.
正解：B
解説：
Explanation
In the context of a Kubernetes service, port: 8080 represents the port that is exposed to clients that are internal to the cluster45. This is the stable port the Service exposes inside the cluster - other Pods in the cluster send traffic to this port4. References from Juniper site: Nigel Poulton, Baeldung
質問 # 24
Your e-commerce application is deployed on a public cloud. As compared to the rest of the year, it receives substantial traffic during the Christmas season.
In this scenario, which cloud computing feature automatically increases or decreases the resources based on the demand?
- A. resource pooling
- B. rapid elasticity
- C. broad network access
- D. on-demand self-service
正解：B
解説：
Explanation
The cloud computing feature that automatically increases or decreases the resources based on the demand is known as rapid elasticity1112. In cloud computing, scaling is the process of adding or removing compute, storage, and network services to meet the demands a workload makes for resources in order to maintain availability and performance as utilization increases11.
質問 # 25
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-k8s-kubemanaqer
- B. cni.bin
- C. contrail-vrouter-agent
- D. kube-a pi server
正解：A
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 # 26
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：
Explanation
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 # 27
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 operational plane
- C. the forwarding plane
C the management plane
正解：C
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 # 28
Which two features are provided by CN2? (Choose two.)
- A. user-defined virtual networks
- B. isolated namespaces
- C. role-based access control
- D. application firewall
正解：A、B
解説：
Explanation
According to the CN2 datasheet1, 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 performance1.
質問 # 29
Which two functions does CN2 provide? (Choose two.)
- A. It provides underlay network management capabilities.
- B. It performs SDN functions in an NFV solution.
- C. It provides an orchestration solution for VMs and containers.
- D. It provides enhanced networking capabilities to private clouds.
正解：C、D
解説：
Explanation
CN2 (Cranial Nerve II), also known as the optic nerve, controls the special sense of vision. It transmits visual information from the retina to the vision centers of the brain78. Two functions that CN2 provides are:
It provides enhanced networking capabilities to private clouds78. It transmits special afferent impulses of light to the brain and is involved in several reflex arcs related to the ocular system7.
It provides an orchestration solution for VMs and containers78. It is a unique structure that functions as the bridge between the retinal layer of the eyes and the visual cortex of the brain7. References from Juniper site: Kenhub, Geeky Medics
質問 # 30
You want to quickly assign a specific combination of permissions to a set of users.
In this scenario, which OpenStack object should you create?
- A. role
- B. project
- C. flavor
- D. image
正解：A
解説：
Explanation
In OpenStack, a role is a set of permissions that determines what actions users can perform in a given context.
Roles are assigned to user-project pairs. If you want to quickly assign a specific combination of permissions to a set of users, you should create a role1. References from Juniper site: OpenStack Docs
質問 # 31
What are two characteristics of the OpenShift Assisted Installer? (Choose two.)
- A. It uses one of the control plane nodes as a bootstrap node.
- B. It provides full feature support and customizations.
- C. It offers REST APIs for the configuration and installation
- D. It does not support bare-metal deployments.
正解：A、C
解説：
Explanation
The OpenShift Assisted Installer uses one of the control plane nodes as a bootstrap node12. It also offers REST APIs for the configuration and installation12.
質問 # 32
What is the name of the Docker container runtime?
- A. dockerd
- B. cri-o
- C. containerd
- D. docker cl
正解：C
解説：
Explanation
The name of the Docker container runtime is containerd, which is a daemon that manages the complete container lifecycle of its host system, from image transfer and storage to container execution and supervision to low-level storage to network attachments and beyond. Dockerd is the Docker daemon that acts as the primary user interface for Docker. Docker cl is not a valid name for any Docker component. Cri-o is another container runtime that implements the Kubernetes Container Runtime Interface (CRI) to enable using OCI (Open Container Initiative) compatible runtimes
質問 # 33
What is the most privileged protection ring?
- A. 0
- B. 1
- C. 2
- D. 3
正解：B
解説：
Explanation
In computer science, hierarchical protection domains, often called protection rings, are mechanisms to protect data and functionality from faults and malicious behavior. Rings are arranged in a hierarchy from most privileged (most trusted, usually numbered zero) to least privileged (least trusted, usually with the highest ring number). On most operating systems, Ring 0 is the level with the most privileges and interacts most directly with the physical hardware12. References from Juniper site: Wikipedia, GeeksforGeeks, Notes
質問 # 34
Which two statements are true about the CN2 controller? (Choose two.)
- A. A CN2 controller communicates with other CN2 controllers using BGP.
- B. A CN2 controller communicates with CN2 vRouters using BGP.
- C. A CN2 controller communicates with other CN2 controllers using XMPP.
- D. A CN2 controller communicates with CN2 vRouters using XMPP.
正解：A、D
解説：
Explanation
A CN2 controller communicates with CN2 vRouters using XMPP (Extensible Messaging and Presence Protocol) and with other CN2 controllers using BGP (Border Gateway Protocol). XMPP is used for control plane communication, while BGP is used for routing updates between controllers.
質問 # 35
In OpenShift, which node type is used to host your application containers?
- A. control plane node
- B. worker node
- C. full node
- D. miner node
正解：B
解説：
Explanation
In OpenShift, the worker node is used to host your application containers1. Worker nodes are where all your coding adventures happen, and they can be virtual or physical1. References from Juniper site: IBM Developer
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 only communicate with pods in the same namespace.
- B. Pods in isolated namespaces can communicate with pods in non-isolated namespaces.
- C. Pods in isolated namespaces can only reach services in the same namespace.
- D. Pods in isolated namespaces can reach services in non-isolated namespaces.
正解：A、C
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 true about VRF instances? (Choose two.)
- A. VRFs enable overlapping IP addresses within the same cloud network.
- B. VRFs share a single routing table.
- C. Each VRF has its own routing table.
- D. VRFs do not enable overlapping IP addresses within the same cloud network.
正解：A、C
解説：
Explanation
Virtual Routing and Forwarding (VRF) is a technology that allows multiple instances of a routing table to coexist within the same router at the same time. Because the routing instances are independent, overlapping IP addresses can be used without conflict45. Each VRF has its own routing table4. References from Juniper site: Wikipedia, Cisco
質問 # 38
What are the two characteristics of the Network Functions Virtualization (NFV) framework? (Choose two.)
- A. It decouples the network control plane from the forwarding plane.
- B. It decouples the network software from the hardware.
- C. It implements virtualized network functions
- D. It implements virtualized tunnel endpoints.
正解：B、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 # 39
Which two tools are used to deploy a Kubernetes environment for testing and development purposes? (Choose two.)
- A. oc
- B. OpenStack
- C. minikube
- D. kind
正解：C、D
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 # 40
Your company has a Web app hosted in Kubernetes with a fluctuating number of pods.
In this scenario, which Kubernetes service type would provide equal access to all nodes using a single URL?
- A. NodePort
- B. ExternalName
- C. LoadBalancer
- D. ClusterIP
正解：C
解説：
Explanation
The LoadBalancer service type in Kubernetes exposes the service externally using a cloud provider's load balancer67. NodePort and ClusterIP services, to which the external load balancer routes, are automatically created
質問 # 41
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JN0-213試験を受けるには、ネットワークの概念に基本的な理解と、Juniper Networksデバイスの設定と管理の経験が必要です。また、クラウドコンピューティングの概念と技術の確固たる理解と、クラウドベースのソリューションの展開と管理の経験も必要です。
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