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[General] DCA Examinations Actual Questions - New DCA Test Bootcamp

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【General】 DCA Examinations Actual Questions - New DCA Test Bootcamp

Posted at yesterday 13:33      View：11 | Replies：0        Print      Only Author   [Copy Link] 1#
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Docker Certified Associate (DCA) certification exam is a professional certification for individuals who have experience working with Docker. Docker Certified Associate (DCA) Exam certification is designed to test the knowledge and understanding of Docker concepts and practices, as well as the ability to use Docker to solve real-world problems. Docker Certified Associate (DCA) Exam certification is offered by Docker, Inc., the company that created and maintains the Docker platform.
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Docker Certified Associate (DCA) Exam Sample Questions (Q10-Q15):NEW QUESTION # 10
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: label contraints
  • A. No
  • B. Yes
Answer: B
Explanation:
Explanation
Label constraints can be used to schedule containers to meet the security policy requirements. Label constraints allow you to specify which nodes a service can run on based on the labels assigned to the nodes1.
For example, you can label the nodes that are intended for development with env=dev and the nodes that are intended for production with env=prod. Then, you can use the --constraint flag when creating a service to restrict it to run only on nodes with a certain label value. For example, docker service create --name dev-app
--constraint 'node.labels.env == dev' ... will create a service that runs only on development nodes2. Similarly, docker service create --name prod-app --constraint 'node.labels.env == prod' ... will create a service that runs only on production nodes3. This way, you can ensure that development and production containers are running on separate nodes in a given Swarm cluster. References:
* Add labels to swarm nodes
* Using placement constraints with Docker Swarm
* Multiple label placement constraints in docker swarm

NEW QUESTION # 11
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Uninstall 'docker-ce' package before installing 'docker-ee' package.
  • A. No
  • B. Yes
Answer: B

NEW QUESTION # 12
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.
  • A. No
  • B. Yes
Answer: B
Explanation:
Explanation
This
statement is correct about this health check definition. A health check is a feature that allows Docker to monitor the health status of a container by running a command in the container periodically. A health check has three parameters: test, interval, and retries. The test parameter specifies the command to run to check the health of the container. The interval parameter specifies how often to run the health check. The retries parameter specifies how many consecutive failures of the health check are needed to mark the container as unhealthy. In this case, the health check runs curl -f http://localhost/ || exit 1 every 10 seconds to test for app health. If this command fails three times in a row, the container is marked as unhealthy. References:
https://docs.docker.com/engine/reference/builder/#healthcheck,
https://docs.docker.com/engine/reference/run/#healthcheck

NEW QUESTION # 13
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: namespaces
  • A. No
  • B. Yes
Answer: B
Explanation:
Namespaces are a Linux kernel feature that isolate containers from each other and from the host system. They limit the access of a container to host resources, such as CPU or memory, by creating a separate namespace for each aspect of a container, such as process IDs, network interfaces, user IDs, etc. This way, a container can only see and use the resources that belong to its own namespace, and not those of other containers or the host12. References:
* Isolate containers with a user namespace | Docker Docs
* Docker overview | Docker Docs

NEW QUESTION # 14
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?
Solution. Set and export the IGNORE_TLS environment variable on the command line.
  • A. No
  • B. Yes
Answer: A
Explanation:
= Setting and exporting the IGNORE_TLS environment variable on the command line is not a way to configure the Docker engine to use a registry without a trusted TLS certificate. This environment variable is not recognized by Docker and has no effect on the TLS verification process1. To use a registry without a trusted TLS certificate, you need to either add the certificate to the system or Docker-specific trust store, or configure the Docker daemon to allow insecure registries23. Reference:
Environment variables | Docker Docs
Verify repository client with certificates | Docker Docs
Test an insecure registry | Docker Docs

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