DCA Exam Docker Certified Associate (DCA) Study Guide Online

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Docker Certified Associate (DCA) is designed to validate that skillset with real world questions designed by experienced Docker practitioners. Docker DCA study guide online written by the professional team of ITExamShop contain 166 practice exam questions with precise answers. Advanced DCA Docker Certified Associate exam questions with verified answers of ITExamShop containing the 100% real exam practice questions along with the Docker DCA PDF Questions provides you a fair possibility inside the Docker Certified Associate exam questions.

Docker Certified Associate (DCA) Free Questions Can Be Read For Checking Below

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1. In Docker Trusted Registry, how would a user prevent an image, for example 'nginx:latest' from being overwritten by another user with push access to the repository?

Tag the image with 'nginx:immutable'

Remove push access from all other users.

Use the DTR web UI to make the tag immutable.

Keep a backup copy of the image on another repository.

2. Which one of the following commands will show a list of volumes for a specific container?

'docker container logs nginx --volumes'

'docker container inspect nginx'

'docker volume inspect nginx'

'docker volume logs nginx --containers'

3. What is the purpose of multi-stage builds?

Better logical separation of Dockerfile instructions for better readability

Optimizing images by copying artifacts selectively from previous stages

Better caching when building Docker images

Faster image builds by allowing parallel execution of Docker builds

4. How do you configure Docker engine to use a registry that is not configured with TLS certificates from a trusted CA?

Set IGNORE_TLS in the 'daemon.json' configuration file.

Set and export the IGNORE_TLS environment variable on the command line

Set INSECURE_REGISTRY in the '/etc/docker/default' configuration file

Pass the '--insecure.-registry' flag to the daemon at run time

5. An application image runs in multiple environments, and each environment uses different certificates and ports, what is the best practice to deploy the containers?

Create a Dockerfile for each environment, specifying ports and ENV variables for certificates.

Create a Dockerfile for each environment, specifying ports and Docker secrets for certificates.

Create images that contain the specific configuration for every environment.

Create a config file for each environment.

6. Will this command ensure that overlay traffic between service tasks is encrypted?

Solution: docker network create -d overlay -o encrypted=true <network-name>

Yes

7. In the context of a swarm mode cluster, does this describe a node?

Solution: an instance of the Docker engine participating in the swarm

Yes

8. Seven managers are in a swarm cluster.

Is this how should they be distributed across three datacenters or availability zones?

Solution: 3-3-1

Yes

9. Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?

Solution: namespaces

Yes

10. Which of the following commands will create a swarm service which only listens on port 53 using the UDP protocol?

docker service create --name dns-cache -p 53:53/udp dns-cache

docker service create --name dns-cache -p 53:53 --service udp dns-cache

docker service create --name dns-cache -p 53:53 ..constraint networking.protocol.udp=true dns-cache

docker service create --name dns-cache -p 53:53 --udp dns-cache

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11. After creating a new service named 'http', you notice that the new service is not registering as healthy.

How do you view the list of historical tasks for that service by using the command line?

'docker inspect http'

'docker service inspect http'

'docker service ps http'

'docker ps http'

12. What is the difference between a resource limit and a resource reservation when scheduling services?

A resource limit and a resource reservation can be used interchangeably.

A resource limit is a soft limit for your service, while a reservation is hard limit and the docker engine will do its best to keep your service at the limit.

A resource limit is used to find a host with adequate resources for scheduling a hard limit for your service, while a reservation is hard limit for your service.

A resource limit is hard limit for your service, while a reservation is used to find a host with adequate resources for scheduling. Correct

13. Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?

Solution: user

Yes

14. Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?

Solution: net

Yes

15. Which of the following is true about using the '-P' option when creating a new container?

Docker binds each exposed container port to a random port on all the host's interface

Docker gives extended privileges to the container.

Docker binds each exposed container port to a random port on a specified host interface

Docker binds each exposed container port with the same port on the host

16. 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 events deployment api

Yes

17. A server is running low on disk space.

What command can be used to check the disk usage of images, containers, and volumes for Docker engine?

'docker system df'

'docker system prune'

'docker system free'

'docker system ps'

18. What is one way of directly transferring a Docker Image from one Docker host in another?

'docker push' the image to the IP address of the target host.

'docker commit' to save the image outside of the Docker filesystem. Then transfer the file over to the target host and 'docker start' to start the container again.

There is no way of directly transferring Docker images between hosts. A Docker Registry must be used ad an intermediary.

'docker save' the image to save it as TAR file and copy it over to the target host. Then use 'docker load' to un-TAR the image back as a Docker image.

19. You have deployed a service to swarm.

Which command uses the Docker CLI to set the number of tasks of the services to 5? (choose 2)

'docker service update --replicas=5 <service-id>'

'docker replica update <service-id>=5'

'docker update service <service-id>=5'

'docker service replicas <service-id>=5'

'docker service scale <service-id> = 5''

20. In the context of a swarm mode cluster, does this describe a node?

Solution: a virtual machine participating in the swarm

Yes

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21. Seven managers are in a swarm cluster.

Is this how should they be distributed across three datacenters or availability zones?

Solution: 3-2-2

Yes

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DCA Exam Docker Certified Associate (DCA) Study Guide Online

Docker Certified Associate (DCA) Free Questions Can Be Read For Checking Below

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