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Docker DCA Exam Questions
- Topic 1: Orchestration: This section of the exam measures the skills of DevOps engineers and covers the configuration and management of Docker Swarm clusters. It includes tasks such as setting up manager and worker nodes, converting containers into services, and manipulating stacks. Candidates must understand the role of templates, inspect and troubleshoot running services, and adjust service scaling and placement using node labels. The section also requires interpreting docker inspect outputs and handling communication between Dockerized applications and legacy systems, emphasizing the importance of quorum in cluster resilience.
- Topic 2: Image Creation, Management, and Registry: This domain assesses cloud infrastructure administrators and focuses on building, managing, and optimizing Docker images. It involves working with Dockerfiles, tagging, and pruning images, as well as understanding image layering and registry usage. Candidates must demonstrate image creation from files, modifications to reduce layers, and the ability to push, pull, and sign images. Registry configuration and management are also included, with tasks involving authentication, search, deletion, and secure access to stored images.
- Topic 3: Installation and Configuration (15%): This section of the exam evaluates the capabilities of cloud infrastructure administrators and addresses Docker engine installation, setup, and configuration across multiple platforms. It includes tasks such as logging driver selection, swarm initialization, error resolution, and user access management. Candidates must demonstrate knowledge of system prerequisites, namespaces, cgroups, and the implementation of secure client-server certificate authentication. It also requires consistent deployment practices for Docker UCP and DTR environments, including backup scheduling and HA configurations.
- Topic 4: Networking: This domain targets DevOps engineers and covers Docker networking fundamentals. It includes creating bridge and overlay networks, publishing ports, diagnosing connectivity issues, and understanding network driver types. Candidates are expected to comprehend the Container Network Model, configure external DNS, and apply HTTP/HTTPS load balancing techniques using Docker EE. Additional topics include evaluating traffic flow between Docker components and distinguishing between different port publishing modes like host and ingress.
- Topic 5: Domain 5: Security: This part of the exam focuses on the knowledge of cloud infrastructure administrators and addresses Docker security configurations and practices. It covers image signing, security scans, Docker Content Trust, and default engine protections. Candidates must configure RBAC settings within UCP, integrate identity systems such as LDAP or Active Directory, and manage UCP client bundles. Understanding MTLS, swarm security defaults, and UCP/DTR certificate usage is essential to meet the requirements of this domain.
- Topic 6: Domain 6: Storage and Volumes: This domain measures the practical storage configuration knowledge of DevOps engineers. It includes selecting appropriate storage drivers based on the OS, configuring devicemapper, and comparing object and block storage. Candidates must understand image layering and its implications on the file system, handle volume configuration for persistent storage, and perform system cleanup of unused images. Cross-node storage usage and differentiating roles between UCP workers and managers are also addressed, along with managing external certificates within UCP and DTR environments.
Free Docker DCA Exam Actual Questions
Note: Premium Questions for DCA were last updated On Jul. 05, 2025 (see below)
Which statement is correct about cluster management in Docker Enterprise Edition 3.x?
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use --link to access the container on the bridge network.
= The action of using--linkto access the container on the bridge network doesnotaccomplish the goal of creating a container that is reachable from its host's network.The--linkoption allows you to connect containers that are running on the same network, but it doesnotexpose the container's ports to the host1.To create a container that is reachable from its host's network, you need to use the--network hostoption, which attaches the container to the host's network stack and makes it share the host's IP address2.Alternatively, you can use the--publishor-poption to map the container's ports to the host's ports3.
: :Legacy container links | Docker Documentation:Networking using the host network | Docker Documentation:docker run reference | Docker Documentation
Is this a type of Linux kernel namespace that provides container isolation?
Solution.Process ID
Process ID is a type of Linux kernel namespace that provides container isolation.Linux namespaces are a feature of the Linux kernel that isolate and virtualize system resources of a collection of processes1.Process ID namespace isolates the process ID number space, meaning that processes in different PID namespaces can have the same PID2.This allows each container to have its own init process with PID 1, which is the ancestor of all other processes in the container3.Process ID namespace also affects other identifiers, such as thread IDs, parent process IDs, and session IDs4.Reference: Namespaces in operation), pid_namespaces),What is a PID namespace?, Linux Namespaces: PID)
Is this an advantage of multi-stage builds?
Solution: simultaneously creates and tags multiple images
Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker swarm nodes'
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