DCA LATEST TEST SAMPLE, EXAM QUESTIONS DCA VCE

DCA Latest Test Sample, Exam Questions DCA Vce

DCA Latest Test Sample, Exam Questions DCA Vce

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Docker Certified Associate (DCA) Exam Sample Questions (Q91-Q96):

NEW QUESTION # 91
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run -v /data:/mydata --mode readonly ubuntu'

  • A. No
  • B. Yes

Answer: A

Explanation:
Explanation
= The command docker run -v /data:/mydata --mode readonly ubuntu is not valid because it has some syntax errors. The correct syntax for running a container with a bind mount is docker run [OPTIONS] IMAGE
[COMMAND] [ARG...]. The errors in the command are:
* The option flag for specifying the volume is --volume or -v, not -v. For example, -v
/data:/mydata should be --volume /data:/mydata.
* The option flag for specifying the mode of the volume is --mount, not --mode. For example, --mode readonly should be --mount type=bind,source=/data,target=/mydata,readonly.
* The option flag for specifying the mode of the container is --detach or -d, not --mode. For example, --mode readonly should be --detach.
The correct command for running a container with a bind mount in read-only mode is:
docker run --volume /data:/mydata --mount type=bind,source=/data,target=/mydata,readonly --detach ubuntu This command will run a container using the ubuntu image and mount the host's /data directory to the container's /mydata directory in read-only mode. The container will run in the background (--detach).
References: : docker run reference | Docker Documentation : [Use bind mounts | Docker Documentation]


NEW QUESTION # 92
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: Kubernetes automatically triggers a user-defined script to attempt to fix the unhealthy container.

  • A. No
  • B. Yes

Answer: A

Explanation:
Explanation
= I cannot give you a comprehensive explanation, but I can tell you that the question is about Kubernetes, not Docker. Kubernetes is an orchestrator that can manage multiple containers in a pod, which is a group of containers that share a network and storage. A livenessProbe is a way to check if a container is alive and ready to serve requests. If a container fails its livenessProbe, Kubernetes will try to restart it by default. However, you can also specify a custom action to take when a container fails its livenessProbe, such as running a script to fix the problem. This is what the solution is referring to. You will need to understand the difference between Kubernetes and Docker, and how they work together, to answer this question correctly. References: You can find some useful references for this question in the following links:
* Kubernetes Pods
* Configure Liveness, Readiness and Startup Probes
* Docker and Kubernetes


NEW QUESTION # 93
Will a DTR security scan detect this?
Solution: licenses for known third party binary components

  • A. No
  • B. Yes

Answer: B

Explanation:
A DTR security scan will detect licenses for known third party binary components. This is because DTR security scan uses a database of vulnerabilities and licenses that is updated regularly from Docker Server1. DTR security scan can identify the components and versions of the software packages that are present in the image layers, and report any known vulnerabilities or licenses associated with them2. This can help users to comply with the licensing requirements and avoid potential legal issues3. References:
* Set up vulnerability scans | Docker Docs
* Scan images for vulnerabilities | Docker Docs
* Container Security 101 - Scanning images for Vulnerabilities


NEW QUESTION # 94
Will this command list all nodes in a swarm cluster from the command line?
Solution. 'docker inspect nodes

  • A. No
  • B. Yes

Answer: A

Explanation:
The command docker inspect nodes will not list all nodes in a swarm cluster from the command line. This is because docker inspect requires one or more names or IDs of the objects to inspect1. To list all nodes in a swarm cluster, you need to use the command docker node ls2, which will display information such as node ID, hostname, status, availability, and role3. References:
* docker inspect | Docker Docs
* docker node ls | Docker Docs
* How to list nodes in a Docker swarm cluster


NEW QUESTION # 95
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 image import <tarball> myorg/myimage:1.0

  • A. No
  • B. Yes

Answer: B

Explanation:
Docker Content Trust (DCT) is a feature that allows users to verify the integrity and publisher of container images they pull or deploy from a registry server, signed on a Notary server1. DCT is enabled by setting the environment variable DOCKER_CONTENT_TRUST=1 on the Docker client. When DCT is enabled, the Docker client will only pull, run, or build images that have valid signatures for a specific tag2. However, DCT does not apply to the docker image import command, which allows users to import an image or a tarball with a repository and tag from a file or STDIN3. Therefore, if myorg/myimage:1.0 is unsigned, Docker will not block the docker image import <tarball> myorg/myimage:1.0 command, even if DCT is enabled. This is because the docker image import command does not interact with a registry or a Notary server, and thus does not perform any signature verification. However, this also means that the imported image will not have any trust data associated with it, and it will not be possible to push it to a registry with DCT enabled, unless it is signed with a valid key. References:
* Content trust in Docker
* Automation with content trust
* [docker image import]
* [Content trust and image tags]


NEW QUESTION # 96
......

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