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Juniper Cloud, Associate (JNCIA-Cloud) Sample Questions (Q35-Q40):

NEW QUESTION # 35
You must install a basic Kubernetes cluster.
Which tool would you use in this situation?

A. dashboard
B. kubectl apply
C. kubectl create
D. kubeadm

Answer: D

Explanation:
To install a basic Kubernetes cluster, you need a tool that simplifies the process of bootstrapping and configuring the cluster. Let's analyze each option:
A . kubeadm
Correct:
kubeadm is a command-line tool specifically designed to bootstrap a Kubernetes cluster. It automates the process of setting up the control plane and worker nodes, making it the most suitable choice for installing a basic Kubernetes cluster.
B . kubectl apply
Incorrect:
kubectl apply is used to deploy resources (e.g., pods, services) into an existing Kubernetes cluster by applying YAML or JSON manifests. It does not bootstrap or install a new cluster.
C . kubectl create
Incorrect:
kubectl create is another Kubernetes CLI command used to create resources in an existing cluster. Like kubectl apply, it does not handle cluster installation.
D . dashboard
Incorrect:
The Kubernetes dashboard is a web-based UI for managing and monitoring a Kubernetes cluster. It requires an already-installed cluster and cannot be used to install one.
Why kubeadm?
Cluster Bootstrapping: kubeadm provides a simple and standardized way to initialize a Kubernetes cluster, including setting up the control plane and joining worker nodes.
Flexibility: While it creates a basic cluster, it allows for customization and integration with additional tools like CNI plugins.
JNCIA Cloud Reference:
The JNCIA-Cloud certification covers Kubernetes installation methods, including kubeadm. Understanding how to use kubeadm is essential for deploying and managing Kubernetes clusters effectively.
For example, Juniper Contrail integrates with Kubernetes clusters created using kubeadm to provide advanced networking and security features.
Reference:
Kubernetes Documentation: kubeadm
Juniper JNCIA-Cloud Study Guide: Kubernetes Installation

NEW QUESTION # 36
Which two statements are true about the CN2 controller? (Choose two.)

A. A CN2 controller communicates with other CN2 controllers using XMPP.
B. A CN2 controller communicates with CN2 vRouters using BGP.
C. A CN2 controller communicates with other CN2 controllers using BGP.
D. A CN2 controller communicates with CN2 vRouters using XMPP.

Answer: C,D

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.

NEW QUESTION # 37
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 communicate with pods in the same namespace.
C. Pods in isolated namespaces can only reach services in the same namespace.
D. Pods in isolated namespaces can communicate with pods in non-isolated namespaces.

Answer: B,C

Explanation:
In Juniper Cloud-Native Contrail Networking (CN2), isolated namespaces are used to isolate a pod from other pods without explicitly configuring a network policy. Pods in an isolated namespace can only communicate with pods in the same namespace. They cannot reach pods or services in other isolated or non-isolated namespaces.

NEW QUESTION # 38
Which Docker component builds, runs, and distributes Docker containers?

A. docker registry
B. docker cli
C. dockerd
D. containerd

Answer: C

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.

NEW QUESTION # 39
Click the Exhibit button.

Referring to the exhibit, which port number would external users use to access the WEB application?

A. 0
B. 1
C. 2
D. 3

Answer: D

Explanation:
The YAML file provided in the exhibit defines a Kubernetes Service object of type NodePort. Let's break down the key components of the configuration and analyze how external users access the WEB application:
Key Fields in the YAML File:
type: NodePort:
This specifies that the service is exposed on a static port on each node in the cluster. External users can access the service using the node's IP address and the assigned nodePort.
port: 8080:
This is the port on which the service is exposed internally within the Kubernetes cluster. Other services or pods within the cluster can communicate with this service using port 8080.
targetPort: 5000:
This is the port on which the actual application (WEB application) is running inside the pod. The service forwards traffic from port: 8080 to targetPort: 5000.
nodePort: 31000:
This is the port on the node (host machine) where the service is exposed externally. External users will use this port to access the WEB application.
How External Users Access the WEB Application:
External users access the WEB application using the node's IP address and the nodePort value (31000).
The Kubernetes service listens on this port and forwards incoming traffic to the appropriate pods running the WEB application.
Why Not Other Options?
A . 80: Port 80 is commonly used for HTTP traffic, but it is not specified in the YAML file. The service does not expose port 80 externally.
B . 8080: Port 8080 is the internal port used within the Kubernetes cluster. It is not the port exposed to external users.
D . 5000: Port 5000 is the target port where the application runs inside the pod. It is not directly accessible to external users.
Why 31000?
NodePort Service Type: The NodePort service type exposes the application on a high-numbered port (default range: 30000-32767) on each node in the cluster.
External Accessibility: External users must use the nodePort value (31000) along with the node's IP address to access the WEB application.
JNCIA Cloud Reference:
The JNCIA-Cloud certification covers Kubernetes networking concepts, including service types like ClusterIP, NodePort, and LoadBalancer. Understanding how NodePort services work is essential for exposing applications to external users in Kubernetes environments.
For example, Juniper Contrail integrates with Kubernetes to provide advanced networking features, such as load balancing and network segmentation, for services like the one described in the exhibit.
Reference:
Kubernetes Documentation: Service Types
Juniper JNCIA-Cloud Study Guide: Kubernetes Networking

NEW QUESTION # 40
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