DCA TRUSTWORTHY SOURCE - DCA EXAM MATERIAL

DCA Trustworthy Source - DCA Exam Material

DCA Trustworthy Source - DCA Exam Material

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Docker Certified Associate (DCA) Exam Sample Questions (Q31-Q36):

NEW QUESTION # 31
In the context of a swarm mode cluster, does this describe a node?
Solution: an instance of the Docker engine participating in the swarm

  • A. No
  • B. Yes

Answer: B

Explanation:
Explanation
In the context of a swarm mode cluster, an instance of the Docker engine participating in the swarm is indeed a node1. A node can be either a manager or a worker, depending on the role assigned by the swarm manager2. A manager node handles the orchestration and management of the swarm, while a worker node executes the tasks assigned by the manager2. A node can join or leave a swarm at any time, and the swarm manager will reconcile the desired state of the cluster accordingly1. References:
* 1: Swarm mode overview | Docker Docs
* 2: Manage nodes in a swarm | Docker Docs


NEW QUESTION # 32
Is this statement correct?
Solution. A Dockerfile stores persistent data between deployments of a container

  • A. No
  • B. Yes

Answer: A

Explanation:
Explanation
A Dockerfile does not store persistent data between deployments of a container. A Dockerfile is a text document that contains instructions for building an image from a base image and other components. A Dockerfile does not store any data itself; it only defines how an image should be built. Persistent data between deployments of a container can be stored using volumes or bind mounts, which are ways of attaching external storage to containers. References: https://docs.docker.com/engine/reference/builder/,
https://docs.docker.com/storage/


NEW QUESTION # 33
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages

  • A. No
  • B. Yes

Answer: B

Explanation:
Explanation
Optimizing images by copying artifacts selectively from previous stages is an advantage of multi-stage builds.
Multi-stage builds allow you to use multiple FROM statements in your Dockerfile, each starting a new stage of the build. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image. This reduces the size and complexity of your images, and improves security and performance. References: https://docs.docker.com/build/building/multi-stage/,
https://docs.docker.com/engine/reference/builder/#copy


NEW QUESTION # 34
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object.
Does this command display it?
Solution: kubectl describe deployment api

  • A. No
  • B. Yes

Answer: B

Explanation:
Explanation
= The command kubectl describe deployment api displays the events table for the deployment object called api, along with other information such as labels, replicas, strategy, conditions, and pod template. The events table shows the history of actions that have affected the deployment, such as scaling, updating, or creating pods. This can help troubleshoot any issues with the deployment. To see only the events table, you can use the flag --show-events=true with the command. References:
* Deployments | Kubernetes
* kubectl - How to describe kubernetes resource - Stack Overflow
* Kubectl: Get Deployments - Kubernetes - ShellHacks
* kubernetes - Kubectl get deployment yaml file - Stack Overflow


NEW QUESTION # 35
Will this command display a list of volumes for a specific container?
Solution. 'docker container inspect nginx'

  • A. No
  • B. Yes

Answer: B

Explanation:
Explanation
Using docker container inspect nginx does display a list of volumes for a specific container. The docker container inspect command shows low-level information about one or more containers in JSON format. This information includes various details about the container's configuration, state, network settings, mounts, etc.
To display a list of volumes for a specific container, you can either look at the Mounts section in the JSON output or use --format '{{ .Mounts }}' to filter out only that section. References:
https://docs.docker.com/engine/reference/commandline/container_inspect/,
https://docs.docker.com/engine/reference/commandline/container_inspect/#format-the-output


NEW QUESTION # 36
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