Regenerate Docker Certified Associate (DCA) Exam DCA Practice Question

NEW QUESTION 1
Which of the following is true about overlay networks?

• A. Overlay networks are created only on the manager node that you created the overlay networking on
• B. Overlay networks are created on all cluster nodes when you create the overlay network.
• C. Overlay networks are first created on the manager node
• D. Then they are created on the worker nodes once a task is scheduled on the specific worker node.
• E. Overlay networks are only created on the manager nodes.

Answer: B

Explanation:
Explanation

NEW QUESTION 2
Which statement is true?

• A. CMD shell format uses this form ["param", param", "param"]
• B. ENTRYPOINT cannot be used in conjuction with CMD
• C. CMD is used to run the software is the image along with any arguments
• D. ENTRYPOINT cannot be overriden in the "docker container run" command

Answer: A

NEW QUESTION 3
Which of the following is required to install Docker EE from a package repository?

• A. Repository URL obtained from Docker Store
• B. License key obtained from Docker Store
• C. Repository URL obtained from Docker Hub
• D. License key obtained from Docker Hub

Answer: A

NEW QUESTION 4
The following health check exists in a Dockerfile: 'HEALTCHECK
CMD curl --fail http://localhost/health || exit 1 '
Which of the following describes its purpose?

• A. Defines the action taken when container health fails, which in this case will kill the container with exit status 1
• B. Defines the health check endpoint on the localhost interface for external monitoring tools to monitor the health of the docker engine.
• C. Defines the health check endpoint on the local host interface for containers to monitor the health of the docker engine.
• D. Defines the health check for the containerized application so that the application health can be monitored by the Docker engine

Answer: A

NEW QUESTION 5
What is the recommended way to configure the daemon flags and environment variables for your Docker daemon in a platform independent way?

• A. Set the configuration options using the ENV variable
• B. Set the configuration options in '/etc/docker/daemon.json'
• C. Set the configuration DOCKER_OPTS in '/etc/default/docker'
• D. Using 'docker config' to set the configuration options.

Answer: B

NEW QUESTION 6
What is the docker command to setup a swarm?

• A. docker swarm init
• B. docker swarm create
• C. docker init swarm
• D. docker create swarm

Answer: A

Explanation:
Explanation https://docs.docker.com/engine/reference/commandline/swarm/

NEW QUESTION 7
Which of the following is NOT backed up when performing a Docker Trusted backup operation?

• A. Access control to repos and images
• B. Repository metadata
• C. Image blobs
• D. DTR configurations

Answer: C

NEW QUESTION 8
Which of the following commands will create a swarm service which only listens on port 53 using the UDP protocol?

• A. docker service create --name dns-cache -p 53:53/udp dns-cache
• B. docker service create --name dns-cache -p 53:53 --service udp dns-cache
• C. docker service create --name dns-cache -p 53:53 ..constraint networking.protocol.udp=true dns-cache
• D. docker service create --name dns-cache -p 53:53 --udp dns-cache

Answer: A

NEW QUESTION 9
Wha is the purpose of Docker Content Trust?

• A. Signing and verification of image tags
• B. Enabling mutual TLS between the Docker client and server
• C. Docker registry TLS verification and encryption
• D. Indicating an image on Docker Hub is an official image

Answer: A

NEW QUESTION 10
What is the docker command to find the current logging driver for a running container?

• A. docker stats
• B. docker info
• C. docker config
• D. docker inspect

Answer: D

NEW QUESTION 11
A container named "analytics" that stores results in a volume called "data" was created. docker run -d --name=analytics -v data:/data app1
How are the results accessed in "data" with another container called "app2"?

• A. docker run -d --name=reports --volume=data app2
• B. docker run -d --name=reports --volumes-from=analytics app2
• C. docker run -d --name=reports --volume=app1 app2
• D. docker run -d --name=reports --mount=app1 app2

Answer: B

NEW QUESTION 12
Which one of the following commands will result in the volume being removed automatically once the container
has exited?

• A. 'docker run --del -v /foo busybox'
• B. 'docker run --read-only -v /foo busybox'
• C. 'docker run --rm -v /foo busybox'
• D. 'docker run --remove -v /foo busybox'

Answer: C

NEW QUESTION 13
How do you configure Docker engine to use a registry that is not configured with TLS certificates from a trusted CA?

• A. Set IGNORE_TLS in the 'daemon.json' configuration file.
• B. Set and export the IGNORE_TLS environment variable on the command line
• C. Set INSECURE_REGISTRY in the '/etc/docker/default' configuration file
• D. Pass the '--insecure.-registry' flag to the daemon at run time

Answer: D

NEW QUESTION 14
What behavior is expected when a service is created with the following command: 'docker service create --publish 8000:80 nginx'

• A. All nodes in the cluster will listen on port 8080 and forward to port 80 in the container.
• B. Only a single node in the cluster will listen on port 8080 and forward to port 80 in the container.
• C. All nodes in the cluster will listen on port 80 and forward to port 8080 in the container.
• D. Only a single node in the cluster will listen on port 80 and forward to port 8080 in the container.

Answer: A

NEW QUESTION 15
Which of the following commands is used to display system-wide Docker configuration on a host?

• A. docker info
• B. docker status
• C. docker inspect
• D. docker system

Answer: A

NEW QUESTION 16
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?

• A. 'docker system df'
• B. 'docker system prune'
• C. 'docker system free'
• D. 'docker system ps'

Answer: A

NEW QUESTION 17
Which of the following constitutes a production-ready devicemapper configuration for the Docker engine?

• A. Create a volume group in devicemapper and utilize the '--dm.thinpooldev' Docker daemon option, specifying the volume group
• B. Format a partition with xfs and mount it at '/var/lib/docker'
• C. Utilize the '--storage-opt dm.directlvm_device' Docker daemon option, specifying a block device
• D. Nothing, devicemapper comes ready for production usage out of the box

Answer: C

Explanation:
Explanation

NEW QUESTION 18
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)

• A. 'docker service update --replicas=5 <service-id>'
• B. 'docker replica update <service-id>=5'
• C. 'docker update service <service-id>=5'
• D. 'docker service replicas <service-id>=5'
• E. 'docker service scale <service-id> = 5''

Answer: AE

NEW QUESTION 19
You have created a Docker bridge network on a host with three containers attached, how do you make this containers accessible outside of the host?

• A. Use network attach to access the containers on the bridge network
• B. Use either EXPOSE or --publish to access the containers on the bridge network
• C. Use network connect to access the containers on the bridge network
• D. Use --link to access the containers on the bridge network Correct

Answer: B

NEW QUESTION 20
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?

• A. Tag the image with 'nginx:immutable'
• B. Remove push access from all other users.
• C. Use the DTR web UI to make the tag immutable.
• D. Keep a backup copy of the image on another repository.

Answer: C

NEW QUESTION 21
When seven managers are in a swarm cluster how would they be distributed across three datacenters or availability zones?

• A. 5-1-1
• B. 3-2-2
• C. 3-3-1
• D. 4-2-1

Answer: B

NEW QUESTION 22
Which of these swarm manager configurations will cause the cluster to be in a lost quorum state?

• A. 4 managers of which 2 are healthy
• B. 1 manager of which 1 is healthy
• C. 3 managers of which 2 are healthy
• D. 5 managers of which 3 are healthy

Answer: A

NEW QUESTION 23
From a DevOps process standpoint, it is best practice to keep changes to an application in version control. Which of the following will allow changes to a docker Image to be stored in a version control system?

• A. docker commit
• B. docker save
• C. A docker-compose.yml file
• D. A dockerfile

Answer: A

NEW QUESTION 24
......