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  1. Home
  2. Docker Certification
  3. DCA Exam
  4. Docker.DCA.v2025-07-01.q110 Dumps
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Question 16

Which one of the following commands will result in the volume being removed automatically once the container
has exited?

Correct Answer: A
insert code

Question 17

One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: The controller managing the pod is autoscaled back to delete the unhealthy pod and alleviate load.

Correct Answer: B
Explanation
= The livenessProbe is a mechanism that checks if the container is alive and healthy, and restarts it if it fails1. The orchestrator is the component that manages the deployment and scaling of containers across a cluster of nodes2. The action taken by the orchestrator to fix the unhealthy container is not to autoscale back and delete the pod, but to recreate the pod on the same or a different node3. This ensures that the desired number of replicas for the pod is maintained, and that the pod can resume its normal operation. Autoscaling back and deleting the pod would reduce the availability and performance of the service, and would not necessarily alleviate the load.
References:
* Configure Liveness, Readiness and Startup Probes | Kubernetes
* What is a Container Orchestrator? | Docker
* Pod Lifecycle | Kubernetes
I hope this helps you understand the concept of livenessProbe and orchestrator, and how they work with Docker and Kubernetes. If you have any other questions related to Docker, please feel free to ask me.
insert code

Question 18

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

Correct Answer: B
insert code

Question 19

You are pulling images from a Docker Trusted Registry installation
configured to use self-signed certificates, and this error appears:
`x509: certificate signed by unknown authority.
You already downloaded the Docker Trusted Registry certificate authority certificate from https://dtr.example.com/ca.
How do you trust it? (Select two.)

Correct Answer: C,E
Explanation
To trust a self-signed certificate from a Docker Trusted Registry (DTR), you need to place the certificate in the appropriate location on all cluster nodes and restart the Docker daemon. There are two possible locations for the certificate, depending on your OS and Docker version1:
*/etc/docker/certs.d/dtr.example.com/ca.crt: This is the preferred location for Linux systems and Docker versions 1.13 and higher. This directory is scanned by Docker for certificates and keys for each registry domain2.
*Your OS certificate path: This is the fallback location for other OSes and Docker versions. You need to find the certificate store for your OS and copy the certificate there. You also need to trust the certificate system-wide, which may require additional steps depending on your OS3.
The other options are not correct because:
*Passing '-trust-certificate ca.crt to the Docker client is not a valid option. There is no such flag for the Docker client4.
*Placing the certificate in '/etc/docker/dtr/dtr.example.com.crt' is not a valid location. The certificate should be in the /etc/docker/certs.d directory, not the /etc/docker/dtr directory1.
*Passing - insecure-registry to the Docker client is not a recommended option. This flag disables the TLS verification for the registry, which makes the communication insecure and vulnerable to attacks.
References:
*Use self-signed certificates | Docker Docs
*Test an insecure registry | Docker Docs
*Add TLS certificates as a trusted root authority to the host OS | Docker Docs
*docker | Docker Docs
*[Deploy a registry server | Docker Docs]
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Question 20

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 constraints

Correct Answer: A
Explanation
Label constraints can be used to schedule containers to meet the security policy requirements. Label constraints are expressions that match node labels to service labels. Node labels are key-value pairs that can be attached to nodes to identify them by certain characteristics, such as role, environment, region, etc. Service labels are key-value pairs that can be attached to services to specify scheduling preferences or requirements, such as node.role == manager or environment != production. Label constraints can be used with the
--constraint flag when creating or updating a service to ensure that the service's containers are scheduled on nodes that match the specified criteria. References:
https://docs.docker.com/engine/swarm/services/#specify-service-constraints,
https://docs.docker.com/engine/swarm/manage-nodes/#add-or-remove-label-metadata
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