Free Docker DCA Exam Actual Questions

The questions for DCA were last updated On Feb 20, 2025

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Question No. 1

Does this command display all the pods in the cluster that are labeled as env; development'?

Solution. 'kubectl gel pods --all-namespaces -I 'env in (development)''

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Correct Answer: B

The commandkubectl gel pods --all-namespaces -l 'env in (development)'does not display all the pods in the cluster that are labeled asenv: development. The command has two typos that prevent it from working correctly. First, the verb should begetinstead ofgel.Second, the label selector flag should be-linstead of-I1.The correct command should bekubectl get pods --all-namespaces -l 'env in (development)', which will list all the pods across all namespaces that have a labelenvwith a valuedevelopment2.Reference:

kubectl Cheat Sheet | Kubernetes

Labels and Selectors | Kubernetes


Question No. 2

A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.

Can this be used to schedule containers to meet the security policy requirements?

Solution: resource reservation

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Correct Answer: B

:Resource reservation is a feature that allows you to specify the amount of CPU and memory resources that a service or a container needs. This helps the scheduler to place the service or the container on a node that has enough available resources. However, resource reservation does not control which node the service or the container runs on, nor does it enforce any separation or isolation between different services or containers. Therefore, resource reservation cannot be used to schedule containers to meet the security policy requirements.


[Reserve compute resources for containers]

[Docker Certified Associate (DCA) Study Guide]

: https://docs.docker.com/config/containers/resource_constraints/

: https://success.docker.com/certification/study-guides/dca-study-guide

Question No. 3

Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?

Solution. Delete the image and delete the image repository from Docker Trusted Registry.

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Correct Answer: B

The sequence of steps willnotcompletely delete an image from disk in the Docker Trusted Registry.Deleting an image and deleting an image repository from the Docker Trusted Registry will only remove the references to the image, but not the actual image data on the disk1.To completely delete an image from disk, you need to run the garbage collection command on the registry server, which will delete any unreferenced blobs2.The garbage collection command isbin/registry garbage-collect /path/to/config.yml3.Reference: Deleting an image), Garbage collection), Running garbage collection)


Question No. 4

Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?

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

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Correct Answer: B

= This is not a way to configure the Docker engine to use a registry without a trusted TLS certificate. There is no such option as IGNORE_TLS in the daemon.json configuration file.The daemon.json file is used to configure various aspects of the Docker engine, such as logging, storage, networking, and security1.To use a registry without a trusted TLS certificate, you need to either add the certificate to the trusted root certificates of the system, or configure the Docker engine to allow insecure registries2.To add the certificate to the trusted root certificates, you need to copy the certificate file to the /etc/docker/certs.d/<registry-hostname>/ directory on every Docker host2.To configure the Docker engine to allow insecure registries, you need to add the registry hostname or IP address to the ''insecure-registries'' array in the daemon.json file3. For example:

{ ''insecure-registries'' : [''myregistry.example.com:5000''] }

Note that using insecure registries is not recommended, as it exposes you to potential man-in-the-middle attacks and data corruption3.You should always use a registry with a trusted TLS certificate, or use Docker Content Trust to sign and verify your images4.Reference:

Daemon configuration file | Docker Docs

Verify repository client with certificates | Docker Docs

Test an insecure registry | Docker Docs

Content trust in Docker | Docker Docs


Question No. 5

Is this an advantage of multi-stage builds?

Solution: better caching when building Docker images

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Correct Answer: A

Better caching when building Docker images 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 build1.This can help you improve the caching efficiency of your Docker images, as each stage can use its own cache layer2.For example, if you have a stage that installs dependencies and another stage that compiles your code, you can reuse the cached layer of the dependencies stage if they don't change, and only rebuild the code stage if it changes2. This can save you time and bandwidth when building and pushing your images.Reference:

Multi-stage builds | Docker Docs

What Are Multi-Stage Docker Builds? - How-To Geek


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