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Docker Certified Associate (DCA) Exam Sample Questions (Q130-Q135):

NEW QUESTION # 130
A persistentVolumeClaim (PVC) is created with the specification storageClass: "", and size requirements that cannot be satisfied by any existing persistentVolume.
Is this an action Kubernetes takes in this situation?
Solution: The PVC remains unbound until a persistentVolume that matches all requirements of the PVC becomes available.

A. Yes
B. No

Answer: A

Explanation:
= A persistentVolumeClaim (PVC) is a request for storage by a user. It is similar to a Pod. Pods consume node resources and PVCs consume PV resources1. A PVC can specify a storage class, which is a way of requesting a certain quality of service for the volume2. If the storage class is empty, it means the PVC does not have any specific storage class requirements and can be bound to any PV that satisfies its size and access mode3. However, if there is no existing PV that matches the PVC's requirements, the PVC remains unbound until a suitable PV becomes available. This can happen either by manual provisioning by an administrator or by dynamic provisioning using StorageClasses1. Reference:
Persistent Volumes | Kubernetes
Storage Classes | Kubernetes
Configure a Pod to Use a PersistentVolume for Storage | Kubernetes

NEW QUESTION # 131
Which statement is correct about cluster management in Docker Enterprise Edition 3.x?

A. Clusters can contain Linux, Windows Server 2016 and 2019, and Linux on IBM z Systems.
B. Clusters can contain Linux only.
C. Clusters can contain Linux and Windows Server 2008 R2 only.
D. Clusters can contain Windows 10 and Windows Server 2016 only.

Answer: D

NEW QUESTION # 132
What is used by the kernel to Isolate resources when running Docker containers?

A. Volumes
B. Overlay networks
C. Namespaces
D. Control groups (also know as cgroups)

Answer: D

NEW QUESTION # 133
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 5-1-1

A. Yes
B. No

Answer: B

Explanation:
Explanation
This is not how they should be distributed across three datacenters or availability zones, because having one manager in two datacenters or availability zones creates a risk of losing quorum if those datacenters or availability zones become unavailable. According to the official documentation, managers should be distributed evenly across datacenters or availability zones to ensure that the swarm can survive the loss of any one datacenter or availability zone.
References: https://docs.docker.com/engine/swarm/admin_guide/#add-manager-nodes-for-fault-tolerance

NEW QUESTION # 134
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods -I env=development'

A. Yes
B. No

Answer: B

Explanation:
The command 'kubectl get pods -I env=development' will not display all the pods in the cluster that are labeled as 'env: development'. This is because the -I flag is not a valid option for kubectl get pods1. The correct flag to use is --selector or -l, which allows you to filter pods by labels2. Therefore, the correct command to display all the pods in the cluster that are labeled as 'env: development' is:
kubectl get pods --selector env=development
or
kubectl get pods -l env=development
References:
* kubectl Cheat Sheet | Kubernetes
* Labels | Kube by Example
I hope this helps you understand the command and the label, and how they work with Kubernetes and pods. If you have any other questions related to Docker, please feel free to ask me.

NEW QUESTION # 135
......

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