Free DCA: Docker Certified Associate (DCA) Exam Questions and Answers

Last updated: September 19, 2026

Exam code

DCA

Provider

Docker

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1000+

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First 10, with answers

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130 mins · 70%

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1. Question #1

   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
   Reveal Answer

2. Question #2

   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
   Reveal Answer

3. Question #3

   What is used by the kernel to Isolate resources when running Docker containers?

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

4. Question #4

   Which of the following statements is true about secrets?

   • A. Secrets can be created from any node in the cluster.
   • B. Secrets can be modified after they are created.
   • C. Secret are stored unencrypted on manager nodes.
   • D. Secrets can be created using standard input (STDIN) and a file.
   Reveal Answer

5. Question #5

   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
   Reveal Answer

6. Question #6

   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.
   Reveal Answer

7. Question #7

   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
   Reveal Answer

8. Question #8

   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'
   Reveal Answer

9. Question #9

   Following the principle of least privilege, which of the following methods can be used to securely grnt access to the specific user to communicate to a Docker engine? (Choose two.)

   Select 2 answers.

   • A. Utilize the '--host 0.0.0.0:2375' option to the Docker daemon to listen on port 2375 over TCP on all interfaces
   • B. Utilize openssl to create TLS client and server certificates, configuring the Docker engine to use with mutual TLS over TCP.
   • C. Utilize the '--host 127.0.0.1:2375' option to the Docker daemon to listen on port 2375 over TCP on localhost
   • D. Give the user root access to the server to allow them to run Docker commands as root.
   • E. Add the user to the 'docker' group on the server or specify the groupè with the '--group' Docker daemon option.
   Reveal Answer

10. Question #10

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

    Type your answer, then reveal.

    Reveal Answer