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Docker DCA Exam Syllabus Topics:

SectionObjectives
Topic 1: Docker Installation & Configuration- Docker Engine setup and configuration
  • 1. Install Docker on Linux/Windows
    • 2. Configure Docker daemon
      Topic 2: Troubleshooting- Diagnostics and debugging
      • 1. Resource monitoring
        • 2. Container logs and events
          Topic 3: Image Creation, Management, and Registry- Docker images lifecycle
          • 1. Docker Hub and private registries
            • 2. Build images using Dockerfile
              • 3. Tagging and pushing images
                Topic 4: Orchestration- Container orchestration basics
                • 1. Scaling containers
                  • 2. Services and stacks
                    • 3. Docker Swarm architecture
                      Topic 5: Storage and Volumes- Data persistence in Docker
                      • 1. Volumes and bind mounts
                        • 2. Storage drivers
                          Topic 6: Security- Docker security fundamentals
                          • 1. Secrets management
                            • 2. Image security scanning
                              • 3. User namespaces and permissions
                                Topic 7: Networking- Docker networking concepts
                                • 1. Overlay networks
                                  • 2. Network troubleshooting
                                    • 3. Bridge networks

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                                      Docker Certified Associate (DCA) Exam Sample Questions (Q168-Q173):

                                      NEW QUESTION # 168
                                      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: Provision a Docker config object for each environment.

                                      Answer: A

                                      Explanation:
                                      Explanation
                                      Provisioning a Docker config object for each environment is a way to provision configuration to containers at runtime. A Docker config object is a file that contains configuration data for an application or service. It can be created using the docker config create command and then attached to a service using the --config flag of the docker service create or update command. This allows different configurations to be applied to different environments without changing the image or the code of the application. References:
                                      https://docs.docker.com/engine/swarm/configs/,
                                      https://docs.docker.com/engine/reference/commandline/config_create/


                                      NEW QUESTION # 169
                                      Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
                                      Solution: net

                                      Answer: A

                                      Explanation:
                                      Explanation
                                      net is not a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. According to the official documentation, net is one of the namespaces that are enabled by default when using namespaces for isolation.
                                      References: https://docs.docker.com/engine/security/userns-remap/#user-namespace-known-limitations


                                      NEW QUESTION # 170
                                      Is this statement correct?
                                      Solution: A Dockerfile stores the Docker daemon's configuration options.

                                      Answer: A

                                      Explanation:
                                      The statement is not correct. A Dockerfile does not store the Docker daemon's configuration options. 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 images, not to configure the Docker daemon. The Docker daemon's configuration options are stored in a JSON file, which is usually located at /etc/docker/daemon.json on Linux systems, or C:\ProgramData\docker\config\daemon.json on Windows2. The JSON file allows you to customize the Docker daemon's behavior, such as enabling debug mode, setting TLS certificates, or changing the data directory2. References: Dockerfile reference), Docker daemon configuration overview)


                                      NEW QUESTION # 171
                                      Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?
                                      Solution: A default provisioner is specified, and subsequently a persistentVolumeClaim is created.

                                      Answer: A

                                      Explanation:
                                      Explanation
                                      = The conditions are not sufficient for Kubernetes to dynamically provision a persistentVolume, because they are missing a StorageClass object. A StorageClass object defines which provisioner should be used and what parameters should be passed to that provisioner when dynamic provisioning is invoked. A persistentVolumeClaim must specify the name of a StorageClass in its storageClassName field to request a dynamically provisioned persistentVolume. Without a StorageClass, Kubernetes cannot determine how to provision the storage for the claim. References:
                                      * Dynamic Volume Provisioning | Kubernetes
                                      * Persistent volumes and dynamic provisioning | Google Kubernetes Engine ...
                                      * Dynamic Provisioning and Storage Classes in Kubernetes or Dynamic Provisioning and Storage Classes in Kubernetes


                                      NEW QUESTION # 172
                                      Your organization has a centralized logging solution, such as Splunk.
                                      Will this configure a Docker container to export container logs to the logging solution?
                                      Solution: Set the log-driver and log-oPt keys to values for the logging solution (Splunk) In the daemon.json file.

                                      Answer: A

                                      Explanation:
                                      Explanation
                                      Setting the log-driver and log-opt keys to values for the logging solution (Splunk) in the daemon.json file will configure a Docker container to export container logs to the logging solution. This is because the Splunk logging driver sends container logs to the HTTP Event Collector in Splunk Enterprise and Splunk Cloud1. To use the Splunk driver as the default logging driver, set the keys log-driver and log-opts to appropriate values in the daemon.json configuration file and restart Docker1. To use the Splunk driver for a specific container, use the commandline flags --log-driver and log-opt with docker run1. The Splunk logging driver supports various options, such as splunk-token, splunk-url, splunk-source, splunk-sourcetype, splunk-index, etc1. References:
                                      Splunk logging driver | Docker Docs1


                                      NEW QUESTION # 173
                                      ......

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