Most Recent Docker DCA Exam Dumps

Prepare for the Docker Certified Associate Exam exam with our extensive collection of questions and answers. These practice Q&A are updated according to the latest syllabus, providing you with the tools needed to review and test your knowledge.

QA4Exam focus on the latest syllabus and exam objectives, our practice Q&A are designed to help you identify key topics and solidify your understanding. By focusing on the core curriculum, These Questions & Answers helps you cover all the essential topics, ensuring you're well-prepared for every section of the exam. Each question comes with a detailed explanation, offering valuable insights and helping you to learn from your mistakes. Whether you're looking to assess your progress or dive deeper into complex topics, our updated Q&A will provide the support you need to confidently approach the Docker DCA exam and achieve success.

The questions for DCA were last updated on Mar 28, 2025.

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Question No. 1

Is this a type of Linux kernel namespace that provides container isolation?

Solution: Storage

AYes

BNo

Show Answer

Correct Answer: B

= Storage is not a type of Linux kernel namespace that provides container isolation.Linux namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources while another set of processes sees a different set of resources1. The feature works by having the same namespace for a set of resources and processes, but those namespaces refer to distinct resources.Since kernel version 5.6, there are 8 kinds of namespaces: mount, UTS, IPC, PID, network, user, cgroup, and time2.Each kind of namespace isolates a different aspect of the system, such as file system mounts, host and domain names, inter-process communication, process IDs, network interfaces, user and group IDs, cgroups, and system time2. Storage is not one of them.Reference:

1: Linux namespaces - Wikipedia

2: Namespaces --- The Linux Kernel documentation

Question No. 2

The following Docker Compose file is deployed as a stack:

Is this statement correct about this health check definition?

Solution. Health checks lest for app health ten seconds apart. Three failed health checks transition the container into "unhealthy" status.

AYes

BNo

Show Answer

Correct Answer: A

The statement is correct. In the provided Docker Compose file, a health check is defined for the service ''app''. It uses curl to perform a health check on the application every 10 seconds (as specified by the ''interval'' parameter). If it fails three times (as specified by the ''retries'' parameter), then the container is marked as unhealthy.A health check is a way of checking the health of a running container and applying actions based on the result1.It can be used to monitor the status of the service and restart the container if it becomes unhealthy2.Reference:

Compose file version 3 reference | Docker Docs

Docker Compose & Health Checks -- Gabriel's World

Question No. 3

An application image runs in multiple environments, with each environment using different certificates and ports. Is this a way to provision configuration to containers at runtime?

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

AYes

BNo

Show Answer

Correct Answer: B

Creating a Dockerfile for each environment, specifying ports and Docker secrets for certificates is not a way to provision configuration to containers at runtime.A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image1. A Dockerfile is used to build an image, not to run a container. Once an image is built, the configuration specified in the Dockerfile cannot be changed at runtime.To provision configuration to containers at runtime, you need to use a different mechanism, such as environment variables, command-line arguments, or config maps234.Reference:

Dockerfile reference | Docker Docs

Environment variables in Compose | Docker Docs

Override the default command | Docker Docs

Configuration management with Containers | Kubernetes

Question No. 4

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