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  1. Home
  2. Docker Certification
  3. DCA Exam
  4. Docker.DCA.v2023-09-25.q118 Dumps
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Question 36

Can this set of commands identify the published port(s) for a container?
Solution: docker container inspect', 'docker port'

Correct Answer: B
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Question 37

Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution. capabilities

Correct Answer: B
Explanation
Capabilities are not a Linux kernel facility that limit a Docker container's access to host resources, such as CPU or memory. Capabilities are a Linux kernel feature that divide the privileges of the root user into distinct units, called capabilities, which can be independently enabled or disabled for each process. Capabilities allow fine-grained control over the operations that a process can perform on the system, such as binding to a privileged port, changing the system time, loading kernel modules, etc. Docker uses capabilities to restrict the default set of capabilities available to the root user inside a container, following the principle of least privilege.
However, capabilities do not affect how much CPU or memory a container can use on the host system.
References: https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities,
https://man7.org/linux/man-pages/man7/capabilities.7.html
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Question 38

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.

Correct Answer: B
Explanation
Deleting the image and deleting the image repository from Docker Trusted Registry (DTR) does not completely delete an image from disk in DTR. Deleting an image only removes its tag and association with a repository, but does not delete its underlying layers from disk. Deleting a repository only removes its metadata and tags, but does not delete its underlying layers from disk either. To completely delete an image from disk in DTR, you need to run a garbage collection job after deleting the image or the repository. A garbage collection job scans the DTR storage and removes any unused layers that are not referenced by any images or repositories. References: https://docs.docker.com/ee/dtr/user/manage-images/delete-images/,
https://docs.docker.com/ee/dtr/admin/configure/garbage-collection/
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Question 39

A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: inter-process communication

Correct Answer: B
Explanation
Inter-process communication is not blocking this operation. Inter-process communication (IPC) is a mechanism that allows processes to communicate and synchronize their actions. IPC creates a set of interfaces for exchanging various types of data. Docker supports IPC namespaces to isolate IPC resources between processes in different containers. However, IPC does not affect the ability to set the system time from inside a Docker container. References: https://docs.docker.com/engine/reference/run/#ipc-settings-ipc,
https://man7.org/linux/man-pages/man7/ipc.7.html
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Question 40

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 storageClass is specified, and subsequently a persistentVolumeClaim is created.

Correct Answer: B
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