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Docker Certified Associate (DCA) Exam Sample Questions (Q10-Q15):

NEW QUESTION # 10
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

A. No
B. Yes

Answer: A

Explanation:
(Please check the official Docker site for the answer) Comprehensive = (Please check the official Docker site for the comprehensive explanation) References: (Some possible references from the web search results are)
* Docker Security - Docker Documentation
* Docker Security Best Practices - Medium
* Docker Security Cheat Sheet - GitHub
* Docker Security: A Comprehensive Guide - Snyk
* Docker Security: Tips and Tricks to Secure Your Containers - DevSecOps I hope this helps you in your exam preparation. Good luck!

NEW QUESTION # 11
What is the difference between a resource limit and a resource reservation when scheduling services?

A. A resource limit and a resource reservation can be used interchangeably.
B. A resource limit is hard limit for your service, while a reservation is used to find a host with adequate resources for scheduling. Correct
C. A resource limit is a soft limit for your service, while a reservation is hard limit and the docker engine will do its best to keep your service at the limit.
D. A resource limit is used to find a host with adequate resources for scheduling a hard limit for your service, while a reservation is hard limit for your service.

Answer: A

NEW QUESTION # 12
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker container run myorg/myimage:1.0

A. Yes
B. No

Answer: A

Explanation:
Explanation
Docker will block the command docker container run myorg/myimage:1.0 if the image tag myorg/myimage:1.0 is unsigned and the environment variable DOCKER_CONTENT_TRUST=1 is set. The reason is that setting DOCKER_CONTENT_TRUST=1 enables Docker Content Trust (DCT), which is a feature that allows users to verify the integrity and publisher of Docker images using digital signatures1.
When DCT is enabled, Docker will only pull, run, or build images that have valid signatures. If an image tag is unsigned or has an invalid signature, Docker will reject the operation and display an error message2. Therefore, to run an unsigned image with DCT enabled, you need to either disable DCT by setting DOCKER_CONTENT_TRUST=0 or use the --disable-content-trust flag, or sign the image tag with a valid key3. References:
* Content trust in Docker
* Determine if Docker image is signed or unsigned
* Signing Images and Enabling Docker Content Trust

NEW QUESTION # 13
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. No
B. Yes

Answer: A

Explanation:
The solution will not work because a hostPath volume mounts a file or directory from the host node's filesystem into the pod, not from the laptop1. The host node is the VM or machine where the pod is scheduled to run, not the machine where the kubectl commands are executed. Therefore, the /data directory on the laptop will not be accessible to the pod unless it is also present on the host node. A better solution would be to use a persistent volume that can be accessed from any node in the cluster, such as NFS, AWS EBS, or Azure Disk2. Reference:
1: Volumes | Kubernetes
2: Persistent Volumes | Kubernetes

NEW QUESTION # 14
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: resource reservation

A. No
B. Yes

Answer: A

Explanation:
Explanation
Resource reservation cannot be used to schedule containers to meet the security policy requirements, because resource reservation only affects the available resources on a node and does not restrict which containers can run on which nodes. According to the official documentation, resource reservation is used to ensure that a service has enough resources to run.
References: https://docs.docker.com/engine/swarm/services/#reserve-memory-or-cpus-for-a-service

NEW QUESTION # 15
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