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Juniper Cloud, Associate (JNCIA-Cloud) Sample Questions (Q49-Q54):

NEW QUESTION # 49
Which Kubernetes component guarantees the availability of ReplicaSet pods on one or more nodes?

A. kube controller
B. kubelet
C. kube-scheduler
D. kube-proxy

Answer: A

Explanation:
Kubernetes components work together to ensure the availability and proper functioning of resources like ReplicaSets. Let's analyze each option:
A . kube-proxy
Incorrect: The kube-proxy manages network communication for services and pods by implementing load balancing and routing rules. It does not guarantee the availability of ReplicaSet pods.
B . kube-scheduler
Incorrect: The kube-scheduler is responsible for assigning pods to nodes based on resource availability and other constraints. While it plays a role in pod placement, it does not ensure the availability of ReplicaSet pods.
C . kube controller
Correct: The kube controller (specifically the ReplicaSet controller) ensures that the desired number of pods specified in a ReplicaSet are running at all times. If a pod crashes or is deleted, the controller creates a new one to maintain the desired state.
D . kubelet
Incorrect: The kubelet ensures that containers are running as expected on a node but does not manage the overall availability of ReplicaSet pods across the cluster.
Why Kube Controller?
ReplicaSet Management: The ReplicaSet controller within the kube controller manager ensures that the specified number of pod replicas are always available.
Self-Healing: If a pod fails or is deleted, the controller automatically creates a new pod to maintain the desired state.
JNCIA Cloud Reference:
The JNCIA-Cloud certification covers Kubernetes control plane components, including the kube controller. Understanding the role of the kube controller is essential for managing the availability and scalability of Kubernetes resources.
For example, Juniper Contrail integrates with Kubernetes to provide advanced networking and security features, relying on the kube controller to maintain the desired state of ReplicaSets.
Reference:
Kubernetes Documentation: ReplicaSet Controller
Juniper JNCIA-Cloud Study Guide: Kubernetes Control Plane

NEW QUESTION # 50
Which OpenStack service provides API client authentication?

A. Neutron
B. Keystone
C. Nova
D. Heal

Answer: B

Explanation:
OpenStack is an open-source cloud computing platform that provides various services for managing infrastructure resources. Let's analyze each option:
A . Keystone
Correct: Keystone is the OpenStack service responsible for identity management and API client authentication . It provides authentication, authorization, and service discovery for other OpenStack services.
B . Nova
Incorrect: Nova is the OpenStack compute service that manages virtual machines and bare-metal servers. It does not handle authentication or API client validation.
C . Heat
Incorrect: Heat is the OpenStack orchestration service that automates the deployment and management of infrastructure resources using templates. It does not provide authentication services.
D . Neutron
Incorrect: Neutron is the OpenStack networking service that manages virtual networks, routers, and IP addresses. It is unrelated to API client authentication.
Why Keystone?
Authentication and Authorization: Keystone ensures that only authorized users and services can access OpenStack resources by validating credentials and issuing tokens.
Service Discovery: Keystone also provides a catalog of available OpenStack services and their endpoints, enabling seamless integration between components.
JNCIA Cloud Reference:
The JNCIA-Cloud certification covers OpenStack services, including Keystone, as part of its cloud infrastructure curriculum. Understanding Keystone's role in authentication is essential for managing secure OpenStack deployments.
For example, Juniper Contrail integrates with OpenStack Keystone to authenticate and authorize network resources, ensuring secure and efficient operation.
Reference:
OpenStack Keystone Documentation
Juniper JNCIA-Cloud Study Guide: OpenStack Services

NEW QUESTION # 51
Which cloud service model provides access to networking, storage, servers, and virtualization in a cloud environment?

A. Software as a Service (SaaS)
B. Platform as a Service (PaaS)
C. Infrastructure as a Service (IaaS)
D. Database as a Service (DaaS)

Answer: C

Explanation:
Cloud service models define how services are delivered and managed in a cloud environment. The three primary models are:
Infrastructure as a Service (IaaS): Provides virtualized computing resources such as servers, storage, networking, and virtualization over the internet. Customers manage their own operating systems, applications, and data, while the cloud provider manages the underlying infrastructure.
Platform as a Service (PaaS): Provides a platform for developers to build, deploy, and manage applications without worrying about the underlying infrastructure. Examples include Google App Engine and Microsoft Azure App Services.
Software as a Service (SaaS): Delivers fully functional applications over the internet, eliminating the need for users to install or maintain software locally. Examples include Salesforce CRM, Google Workspace, and Microsoft Office 365.
Database as a Service (DaaS): A specialized subset of PaaS that provides managed database services.
In this question, the focus is on access to networking, storage, servers, and virtualization , which are the core components of IaaS . IaaS allows customers to rent infrastructure on-demand and build their own environments without investing in physical hardware.
Why IaaS?
Flexibility: Customers have full control over the operating systems, applications, and configurations.
Scalability: Resources can be scaled up or down based on demand.
Cost Efficiency: Pay-as-you-go pricing eliminates upfront hardware costs.
JNCIA Cloud Reference:
The JNCIA-Cloud certification emphasizes understanding the different cloud service models and their use cases. IaaS is particularly relevant for organizations that want to leverage cloud infrastructure while maintaining control over their applications and data.
For example, Juniper Contrail integrates with IaaS platforms like OpenStack to provide advanced networking and security features for virtualized environments.
Reference:
NIST Cloud Computing Reference Architecture
Juniper JNCIA-Cloud Study Guide: Cloud Service Models

NEW QUESTION # 52
Juniper Cloud-Native Contrail Networking (CN2) is able to be integrated with which orchestrator?

A. CloudStack
B. Marathon
C. Kubernetes
D. Mesosphere

Answer: C

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.

NEW QUESTION # 53
Which two statements are correct about an overlay network? (Choose two.)

A. The overlay network is the virtual network used to connect multiple virtual machines (VMs).
B. The overlay network can only be built using a Layer 3 underlay network.
C. The overlay network is built using encapsulation tunnels.
D. The overlay network provides physical connectivity between devices.

Answer: A,C

Explanation:
An overlay network is a virtual network that is built on top of another network. Nodes in the overlay network are connected by virtual or logical links, each of which corresponds to a path, perhaps through many physical links, in the underlying network. For example, distributed systems such as peer-to-peer networks and client-server applications often overlay their own network connections over the physical network connections provided by the Internet.

NEW QUESTION # 54
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