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  2. Docker Certification
  3. DCA Exam
  4. Docker.DCA.v2024-05-09.q158 Dumps
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Question 71

The Kubernetes yaml shown below describes a networkPolicy.

Will the networkPolicy BLOCK this traffic?
Solution: a request issued from a pod lacking the tier: api label, to a pod bearing the tier: backend label

Correct Answer: B
Explanation
The networkPolicy will not block this traffic because it does not apply to pods that have the tier: backend label. The networkPolicy only applies to pods that have the tier: frontend label, as specified by the podSelector field. Pods that have the tier: backend label are not affected by this networkPolicy and can receive traffic from any source.
References:
https://kubernetes.io/docs/concepts/services-networking/network-policies/#the-networkpolicy-resource
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Question 72

You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution:'docker inspect http'

Correct Answer: B
Explanation
= The 'docker inspect' command returns low-level information on Docker objects, such as containers, images, networks, etc1 It does not show the list of historical tasks for a service. To view the list of tasks for a service, you need to use the 'docker service ps' command 2. For example, to see the tasks for the 'http' service, you would run 'docker service ps http'. This would show the ID, name, image, node, desired state, current state, and error of each task 2. References: Docker inspect | Docker Docs, Docker service ps | Docker Docs
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Question 73

You want to mount external storage to a particular filesystem path in a container in a Kubernetes pod.
What is the correct set of objects to use for this?

Correct Answer: D
Explanation
In Kubernetes, to mount external storage to a filesystem path in a container within a pod, you would use a volume in the pod specification. This volume is populated with a persistentVolumeClaim that is bound to an existing persistentVolume. The persistentVolume is defined and managed by the storageClass which provides dynamic or static provisioning of the volume and determines what type of storage will be provided1.
References:
*Dynamic Volume Provisioning | Kubernetes
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Question 74

In the context of a swarm mode cluster, does this describe a node?
Solution: a physical machine participating in the swarm

Correct Answer: A
Explanation
A node is a physical or virtual machine running Docker Engine in swarm mode1. A node can be either a manager or a worker, depending on its role in the cluster1. A physical machine participating in the swarm is a node, regardless of its role or availability2. References:
* How nodes work | Docker Docs
* Manage nodes in a swarm | Docker Docs
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Question 75

Two development teams in your organization use Kubernetes and want to deploy their applications while ensuring that Kubernetes-specific resources, such as secrets, are grouped together for each application.
Is this a way to accomplish this?
Solution. Create a collection for for each application.

Correct Answer: B
Explanation
= Creating a collection for each application is not a way to accomplish this. A collection is a term used by Ansible to describe a package of related content that can be used to automate the management of Kubernetes resources1. A collection is not a native Kubernetes concept and does not group resources together within the cluster. To group Kubernetes-specific resources, such as secrets, for each application, you need to use namespaces. A namespace is a logical partition of the cluster that allows you to isolate resources and apply policies to them2. You can create a namespace for each application and store the secrets and other resources in that namespace. This way, you can prevent conflicts and limit access to the resources of each application. To create a namespace, you can use the kubectl create namespace command or a yaml file2. To create a secret within a namespace, you can use the kubectl create secret command with the --namespace option or a yaml file with the metadata.namespace field3. References:
* Kubernetes Collection for Ansible - GitHub
* Namespaces | Kubernetes
* Secrets | Kubernetes
* Managing Secrets using kubectl | Kubernetes
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