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To prepare for the Docker DCA exam, it is essential to have hands-on experience working with Docker. Docker provides a wealth of resources, including official documentation, training courses, and practice exams, to help individuals prepare for the exam. The official Docker documentation covers all the topics tested in the exam, and the training courses provide in-depth knowledge and practical experience in working with Docker. Practice exams are also available to help individuals familiarize themselves with the exam format and content.

The DCA Certification Exam was created by Docker, Inc., the company behind the Docker platform, and is administered by Pearson VUE, a leading provider of computer-based testing. Docker Certified Associate (DCA) Exam certification is valid for two years from the date of issue, after which candidates must recertify to maintain their certification status.

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Docker Certified Associate (DCA) Exam Sample Questions (Q132-Q137):

NEW QUESTION # 132
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution. pid

A. Yes
B. No

Answer: B

Explanation:
= The pid namespace is not a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. The pid namespace is one of the six namespaces that are enabled by default when you run a container with Docker1. The pid namespace isolates the process ID number space, meaning that processes in different pid namespaces can have the same PID2. This allows containers to have their own init process with PID 1 and to limit the visibility and interaction of processes between containers and the host3. To disable the pid namespace, you need to use the --pid option with the docker run command and specify the host or another container as the pid mode. References:
* Docker run reference | Docker Docs
* pid_namespaces(7) - Linux manual page - man7.org
* Building containers by hand: The PID namespace - Enable Sysadmin
* [Share host and container processes with --pid | Docker Docs]

NEW QUESTION # 133
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods --all-namespaces -I env=development'

A. Yes
B. No

Answer: B

Explanation:
Explanation
The command 'kubectl get pods --all-namespaces -I env=development' does not display all the pods in the cluster that are labeled as 'env: development'. The reason is that the flag -I is not a valid option for kubectl get pods. The correct flag to use is --selector or -l, which allows you to filter pods by labels1. Labels are key-value pairs that can be attached to Kubernetes objects to identify, group, or select them2. For example, to label a pod with env=development, one can run:
kubectl label pods my-pod env=development
To display all the pods that have the label env=development, one can run:
kubectl get pods --selector env=development
or
kubectl get pods -l env=development
The --all-namespaces flag can be used to list pods across all namespaces3. Therefore, the correct command to display all the pods in the cluster that are labeled as 'env: development' is:
kubectl get pods --all-namespaces --selector env=development
or
kubectl get pods --all-namespaces -l env=development References:
* kubectl Cheat Sheet | Kubernetes
* Labels and Selectors | Kubernetes
* kubectl get | Kubernetes

NEW QUESTION # 134
Is this an advantage of multi-stage builds?
Solution: better caching when building Docker images

A. Yes
B. No

Answer: B

Explanation:
Explanation
Better caching when building Docker images is not an advantage of multi-stage builds. Multi-stage builds are a feature that allows you to use multiple FROM statements in a single Dockerfile. Each FROM statement begins a new stage of the build, with its own base image and instructions. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image. The advantages of multi-stage builds are:
Reducing the size of the final image by removing unnecessary dependencies or intermediate files.
Improving the security of the final image by minimizing the attack surface and avoiding leaking secrets.
Simplifying the development workflow by using different tools or environments in different stages.
Better caching when building Docker images is not an advantage of multi-stage builds, as it depends on other factors, such as the order and content of the instructions in each stage, the availability and freshness of the base images and intermediate layers, and the use of build arguments or environment variables that may invalidate the cache. References:
https://docs.docker.com/develop/develop-images/multistage-build/,
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#leverage-build-cache

NEW QUESTION # 135
Will this command mount the host's '/data1 directory to the ubuntu container in read-only mode?
Solution. 'docker run -v /data:/mydata -mode readonly ubuntu'

A. Yes
B. No

Answer: B

Explanation:
The command docker run -v /data:/mydata -mode readonly ubuntu will not mount the host's /data1 directory to the ubuntu container in read-only mode. The command has several errors that prevent it from working correctly. First, the host directory should be /data1 instead of /data, as specified in the question. Second, the option flag should be --mode instead of -mode, and it should be placed before the image name. Third, the mode value should be ro instead of readonly, as per the Docker documentation1. The correct command should be docker run -v /data1:/mydata --mode ro ubuntu, which will mount the host's /data1 directory as a read-only volume at /mydata inside the container1. References:
* docker run | Docker Docs

NEW QUESTION # 136
The following Docker Compose file is deployed as a stack:

Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.

A. Yes
B. No

Answer: B

NEW QUESTION # 137
......

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