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JN0-213試験は、65問の多肢選択問題からなる90分間の試験です。試験は、英語、日本語、中国語など、いくつかの言語で受験することができます。候補者は、ピアソンVUEテストセンターで受験するか、自宅やオフィスからオンラインで受験することができます。
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
Click the Exhibit button.
Referring to the exhibit, what does port: 8080 represent?
- A. It is the port that is used by the external load balancer.
- B. It is the port that is exposed to clients that are internal to the cluster.
- C. It is the port on which the webapp pod is listening.
- 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 # 35
The openstack user list command uses which OpenStack service?
- A. Keystone
- B. Nova
- C. Neutron
- D. Cinder
正解：A
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 # 36
Which virtualization method requires less duplication of hardware resources?
- A. hardware-assisted virtualization
- B. full virtualization
- C. paravirtualization
- D. OS-level virtualization
正解：D
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 # 37
Which Docker component builds, runs, and distributes Docker containers?
- A. containerd
- B. docker registry
- C. docker cli
- D. dockerd
正解：D
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 # 38
Which two statements are correct about Network Functions Virtualization (NFV)? (Choose two.)
- A. The NFV infrastructure (NFVI) is a component of NFV.
- B. The NFV framework is defined by the W3C.
- C. The NFV infrastructure (NFVI) is not a component of NFV.
- D. The NFV framework explains how VNFs fits into the whole solution.
正解：A、D
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 # 39
What is the function that enables CN2 to manage its resources and interact with the kube-api?
- A. the configuration plane
- B. the data plane
- C. the management plane
- D. the control plane
正解：A
解説：
Explanation
The configuration plane is the function that enables CN2 to manage its resources and interact with the kube-api. The configuration plane is responsible for storing and managing all configuration data in a Contrail cluster. It provides APIs for other components to retrieve this data. This allows CN2 to manage its resources and interact with the kube-api.
質問 # 40
Which statement is correct about a vRouter?
- A. A vRouter uses virtual routing and forwarding (VRF) instances to create individual routing tables for each tenant.
- B. A vRouter uses logical systems to create individual routing tables for each tenant.
- C. A vRouter always provides a direct connection between a tenant VM and the underlay network.
- D. A vRouter can only provide connections to a single tenant's VM.
正解：A
解説：
Explanation
A vRouter uses virtual routing and forwarding (VRF) instances to create individual routing tables for each tenant. A VRF is a logical partition of a router's routing table that allows multiple instances of routing information to coexist on the same router. A vRouter can provide connections to multiple tenants' VMs by using different VRFs for each tenant
質問 # 41
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 only communicate with pods in the same namespace.
- D. Pods in isolated namespaces can communicate with pods in non-isolated namespaces.
正解：B、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 # 42
What are two Kubernetes objects? (Choose two.)
- A. service
- B. cluster
- C. pod
- D. namespace
正解：A、C
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 # 43
Juniper Cloud-Native Contrail Networking (CN2) is able to be integrated with which orchestrator?
- A. CloudStack
- B. Mesosphere
- C. Kubernetes
- D. Marathon
正解：C
解説：
Explanation
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 # 44
You must provide tunneling in the overlay that supports multipath capabilities.
Which two protocols provide this function? (Choose two.)
- A. MPLSoGRE
- B. VXLAN
- C. MPLSoUDP
- D. VPN
正解：B、C
解説：
Explanation
MPLSoUDP (Multiprotocol Label Switching over User Datagram Protocol) and VXLAN (Virtual Extensible LAN) are two protocols that provide tunneling in the overlay and support multipath capabilities45.
MPLSoUDP is an encapsulation protocol that allows MPLS packets to be encapsulated in UDP packets. VXLAN is a network virtualization technology that attempts to address the scalability problems associated with large cloud computing deployments
質問 # 45
Which virtualization method requires less duplication of hardware resources?
- A. hardware-assisted virtualization
- B. full virtualization
- C. paravirtualization
- D. OS-level virtualization
正解：D
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 # 46
Which statement is true about containers?
- A. Containers are slower to boot than virtual machines.
- B. Containers share a copy of the host's operating system binaries.
- C. Containers perform abstraction at the physical layer.
- D. Containers perform abstraction at the application layer.
正解：D
解説：
Explanation
Containers perform abstraction at the application layer12. They are executable units of software in which application code is packaged along with its libraries and dependencies, in common ways so that the code can be run anywhere-whether it be on desktop, traditional IT or the cloud12.
質問 # 47
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 # 48
Which two Linux commands would you use to show the amount of RAM in your system? (Choose two.)
- A. df -h
- B. cat /proc/meminto
- C. cat /proc/cpuinfo
- D. free -h
正解：B、D
解説：
Explanation
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 kernel89. 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 kernel1
質問 # 49
Which two statements are true about virtual networks? (Choose two.)
- A. Virtual networks are available on common Linux distributions.
- B. Virtual networks are limited to a single device.
- C. Virtual networks are able to span multiple devices.
- D. Virtual networks are available only as part of a cloud orchestration system.
正解：A、C
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 # 50
Which statement is correct about overlay or underlay networks or fabrics?
- A. Overlay networks are Layer 3 networks that must use OSPF for routing purposes.
- B. Underlay fabrics enable multitenancy through virtualization.
- C. Underlay fabrics decouple network services from the overlay infrastructure.
- D. Overlay networks are virtual networks.
正解：D
解説：
Explanation
Overlay networks are indeed virtual networks. They are logical constructs that stitch together disparate, dispersed network infrastructure, often referred to as underlay1. Underlay networks refer to the physical network infrastructure, while overlay networks implement network virtualization concepts2. References from Juniper site: Baeldung on Computer Science, PacketFabric, Cisco, HPE Aruba Networking
質問 # 51
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 # 52
Click the Exhibit button.
You apply the manifest file shown in the exhibit.
Which two statements are correct in this scenario? (Choose two.)
- A. The created pods are receiving traffic on port 80.
- B. This manifest is used to create a deployment.
- C. This manifest is used to create a
- D. Four pods are created as a result of applying this manifest.
正解：B、D
解説：
Explanation
This manifest is used to create a deployment, which is a Kubernetes resource that manages a set of pods with the same configuration. A deployment can also provide declarative updates, scaling, and rolling back for the pods. The created pods are not receiving traffic on port 80, because the manifest does not specify a service or a selector for the deployment. A service is another Kubernetes resource that defines a logical set of pods and a policy to access them. A selector is a label query that matches the pods that belong to the service. Four pods are created as a result of applying this manifest, because the manifest specifies replicas: 4 in the spec section of the deployment
質問 # 53
What are two available installation methods for an OpenShift cluster? (Choose two.)
- A. installer-provisioned infrastructure
- B. kubeadm
- C. user-provisioned infrastructure
- D. kubesprav
正解：A、C
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 # 54
Which cloud service model provides access to networking, storage, servers, and virtualization in a cloud environment?
- A. Platform as a Service (Paa)
- B. Database as a Service (Daa)
- C. Software as a Service (Saa)
- D. Infrastructure as a Service (laaS)
正解：D
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 # 55
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