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Docker Certification
DCA Exam
Docker.DCA.v2025-07-01.q110 Dumps

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Question 46

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

A.Yes
B.No

Correct Answer: B

= Host 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. There are eight kinds of namespaces available: Mount, Process, User, Network, UTS, IPC, Cgroup, and Time1. Host is a parameter that can be used to run a container in the host's network namespace, which means the container shares the same network interfaces and configuration as the host2. References:
* Linux namespaces - Wikipedia
* Network settings | Docker Documentation

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Question 47

During development of an application meant to be orchestrated by Kubernetes, you want to mount the /data directory on your laptop into a container.
Will this strategy successfully accomplish this?
Solution: Add a volume to the pod that sets hostPath.path: /data, and then mount this volume into the pod's containers as desired.

A.Yes
B.No

Correct Answer: A

Explanation
Adding a volume to the pod that sets hostPath.path: /data, and then mounting this volume into the pod's containers as desired is a strategy that successfully accomplishes this. A hostPath volume mounts a file or directory from the host node's filesystem into a pod. It can be used to access files on the host from a container, such as configuration files, logs, binaries, etc. However, this type of volume is not portable across nodes and should be used with caution. References: https://kubernetes.io/docs/concepts/storage/volumes/#hostpath,
https://kubernetes.io/docs/tasks/configure-pod-container/configure-volume-storage/

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Question 48

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: docker logs <container-id>

A.Yes
B.No

Correct Answer: B

= The command docker logs <container-id> will not configure a Docker container to export container logs to the logging solution, such as Splunk. This command only displays the logs of a specific container in the standard output or a file, but does not send them to any external system1. To export container logs to Splunk, you need to use the Docker Logger Drivers, which are plugins that provide logging capabilities for Docker containers2. The Splunk logging driver sends container logs to HTTP Event Collector in Splunk Enterprise and Splunk Cloud3. To use the Splunk logging driver for a specific container, you need to use the command-line flags --log-driver and --log-opt with docker run, and provide the Splunk token and URL as options3. For example:
$ docker run --log-driver=splunk --log-opt splunk-token=VALUE --log-opt splunk-url=VALUE ...
:
docker logs | Docker Documentation
Logging drivers | Docker Documentation
Splunk logging driver | Docker Documentation

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Question 49

Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker Is -a'

A.Yes
B.No

Correct Answer: B

The command docker Is -a does not list all nodes in a swarm cluster from the command line, but rather lists all containers, both running and stopped, on the current node1. To list all nodes in a swarm cluster, you need to use the command docker node ls from a manager node2. This command shows the node ID, hostname, status, availability, and manager status for each node in the swarm2. You can also use the --filter option to filter the output based on various criteria2. References: Docker Documentation, docker node ls

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Question 50

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.Yes
B.No

Correct Answer: B

= 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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