FREE PDF ACCURATE DCA - DOCKER CERTIFIED ASSOCIATE (DCA) EXAM RELIABLE TEST PREPARATION

Free PDF Accurate DCA - Docker Certified Associate (DCA) Exam Reliable Test Preparation

Free PDF Accurate DCA - Docker Certified Associate (DCA) Exam Reliable Test Preparation

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To qualify for the Docker Certified Associate (DCA) exam, candidates must have a solid understanding of Docker technology and its various components. They should also be familiar with the Docker command line interface (CLI) and have experience working with Docker images, containers, and networks. Candidates can prepare for the exam by taking Docker training courses, reading the Docker documentation, and practicing with Docker technology on their own.

The DCA Exam consists of 55 multiple-choice questions, which must be answered within 90 minutes. To pass the exam, candidates must score at least 65%. DCA exam is available in multiple languages, including English, Japanese, and Simplified Chinese. DCA exam can be taken online or at an authorized testing center.

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Docker Certified Associate (DCA) Exam Sample Questions (Q151-Q156):

NEW QUESTION # 151
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. No
  • B. Yes

Answer: A

Explanation:
= I cannot give you a comprehensive explanation, but I can tell you that the question is about Docker Swarm, which is a native clustering solution for Docker1. Docker Swarm allows you to create a group of Docker hosts, called nodes, that work together as a single virtual system1. Nodes can be either managers or workers. Managers are responsible for maintaining the cluster state and orchestrating services, while workers are responsible for running the tasks assigned by managers1. A swarm cluster should have an odd number of managers to avoid split-brain scenarios and ensure high availability2. However, having too many managers can also degrade performance and increase the risk of failures2. Therefore, the recommended number of managers is between 3and 72. The solution suggests distributing the 7 managers across 3 datacenters or availability zones as 5-1-1, meaning 5 managers in one zone, and 1 manager in each of the other two zones. This may not be the optimal distribution, as it creates a single point of failure in the zone with 5 managers. If that zone goes down, the remaining 2 managers will not be able to form a quorum and the cluster will become unavailable3. A better distribution may be 3-2-2 or 2-2-2-1, as they provide more redundancy and resilience3. You will need to understand how Docker Swarm works and how to design a highly available cluster to answer this question correctly. Reference: You can find some useful references for this question in the following links:
Docker Swarm overview
Swarm mode key concepts
Swarm mode best practices


NEW QUESTION # 152
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: net

  • A. No
  • B. Yes

Answer: A

Explanation:
Explanation
net is not a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. According to the official documentation, net is one of the namespaces that are enabled by default when using namespaces for isolation.
References: https://docs.docker.com/engine/security/userns-remap/#user-namespace-known-limitations


NEW QUESTION # 153
Will this command list all nodes in a swarm cluster from the command line?
Solution. 'docker inspect nodes

  • A. No
  • B. Yes

Answer: A

Explanation:
= The command docker inspect nodes will not list all nodes in a swarm cluster from the command line. This command is invalid, as docker inspect requires one or more object names or IDs as arguments1. To list all nodes in a swarm cluster, you need to use the docker node ls command from a manager node2. This command will display the ID, hostname, status, availability, manager status, and engine version of each node in the swarm2. You can also use the -f or --filter flag to filter the nodes by various criteria, such as role, label, or name2. Reference:
1: docker inspect | Docker Docs
2: docker node ls | Docker Docs


NEW QUESTION # 154
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 one namespace for each application and add all the resources to it.

  • A. No
  • B. Yes

Answer: B

Explanation:
Explanation
Namespaces in Kubernetes are a way to create and organize virtual clusters within physical clusters where we can isolate a group of resources within a single cluster1. Namespace helps to organize resources such as pods, services, and volumes within the cluster2. By creating one namespace for each application and adding all the resources to it, the development teams can ensure that Kubernetes-specific resources, such as secrets, are grouped together for each application. This also provides a scope for names, a mechanism to attach authorization and policy, and a way to divide cluster resources between multiple users3. References:
* Namespaces | Kubernetes
* Kubernetes - Namespaces - GeeksforGeeks
* Namespaces Walkthrough | Kubernetes


NEW QUESTION # 155
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?

  • A. a persistentVolume in the pod specification, populated with a persistentVolumeClaim which is bound to a volume defined by a storageClass
  • B. a volume in the pod specification, populated with a storageClass which is bound to a provisioner defined by a persistentVolume
  • C. a storageClass in the pod's specification, populated with a volume which is bound to a provisioner defined by a persistentVolume
  • D. a volume in the pod specification, populated with a persistentVolumeClaim bound to a persistentVolume defined by a storageClass

Answer: D

Explanation:
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


NEW QUESTION # 156
......

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