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Docker Certified Associate (DCA) exam is a certification program that measures the skills and knowledge of an individual in containerization using Docker. It is an online, proctored exam that is designed to test the candidate's ability to work with Docker containers, images, networks, and storage. DCA exam is based on the latest version of Docker, ensuring that candidates are tested on the most up-to-date technology.
Docker Certified Associate (DCA) certification exam is a valuable credential for professionals who work with Docker technologies. DCA Exam Tests an individual's knowledge and skills related to Docker and can lead to better job opportunities and higher salaries. If you work with Docker on a regular basis, the DCA certification exam is definitely worth considering to validate your skills and knowledge.
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It is seen as a challenging task to pass the DCA exam. Tests like these demand profound knowledge. The Docker DCA certification is absolute proof of your talent and ticket to high-paying jobs in a renowned firm. Docker DCA test every year to shortlist applicants who are eligible for the DCA exam certificate.
Docker has become one of the most popular technologies for containerization and application development. As the popularity of Docker continues to grow, so does the need for skilled professionals who can manage and deploy Docker containers. The Docker Certified Associate (DCA) exam is designed to validate the skills and expertise of professionals who work with Docker. DCA Exam is intended to test the candidate's knowledge of Docker concepts, Docker architecture, and Docker installation and configuration.
Docker Certified Associate (DCA) Exam Sample Questions (Q61-Q66):
NEW QUESTION # 61
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution. 'docker service create -name dns-cache -p 53:53 -udp dns-cache'
Answer: B
Explanation:
Explanation
= The command docker service create -name dns-cache -p 53:53 -udp dns-cache will not create a swarm service that only listens on port 53 using the UDP protocol. The reason is that the command has several syntax errors and invalid options. The correct command to create a swarm service that only listens on port 53 using the UDP protocol is docker service create --name dns-cache --publish published=53,target=53,protocol=udp dns-cache12. The command docker service create -name dns-cache -p 53:53 -udp dns-cache has the following problems:
* The option -name is not a valid option for docker service create. The valid option for specifying the service name is --name3.
* The option -p is not a valid option for docker service create. The valid option for publishing a port for a service is --publish1.
* The option -udp is not a valid option for docker service create. The valid option for specifying the protocol for a published port is protocol within the --publish option1.
* The argument 53:53 is not a valid argument for docker service create. The argument for docker service create should be the image name for the service, such as dns-cache3. The source and target of the published port should be specified in the --publish option, separated by a comma1.
Therefore, the command docker service create -name dns-cache -p 53:53 -udp dns-cache will not work as intended, and will likely produce an error message or an unexpected result. References:
* Use swarm mode routing mesh
* Manage swarm service networks
* docker service create
NEW QUESTION # 62
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.
Answer: B
Explanation:
Explanation
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. The IGNORE_TLS environment variable is not recognized by Docker and has no effect on its behavior. To configure the Docker engine to use a registry without a trusted TLS certificate, you need to either set INSECURE_REGISTRY in the /etc/docker/default configuration file or add --insecure-registry flag to the dockerd command. References:
https://docs.docker.com/registry/insecure/,
https://docs.docker.com/engine/reference/commandline/dockerd/#insecure-registries
NEW QUESTION # 63
Is this the purpose of Docker Content Trust?
Solution: Enable mutual TLS between the Docker client and server.
Answer: B
Explanation:
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 server12. DCT does not enable mutual TLS between the Docker client and server, which is a different security mechanism that ensures encrypted and authenticated communication between the client and the server3. DCT is based on digital signatures and The Update Framework (TUF) to provide trust over arbitrary collections of data1. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* Protect the Docker daemon socket | Docker Docs
NEW QUESTION # 64
Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution: 'docker service create -name dns-cache -p 53:53 -service udp dns-cache'
Answer: B
NEW QUESTION # 65
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages
Answer: A
Explanation:
Multi-stage builds are a feature of Docker that allows you to use multiple FROM statements in your Dockerfile. Each FROM statement creates a new stage of the build, which can use a different base image and run different commands. You can then copy artifacts from one stage to another, leaving behind everything you don't want in the final image. This optimizes the image size and reduces the attack surface by removing unnecessary dependencies and tools. For example, you can use a stage to compile your code, and then copy only the executable file to the final stage, which can use a minimal base image like scratch. This way, you don't need to include the compiler or the source code in the final image. Reference:
Multi-stage builds | Docker Docs
What Are Multi-Stage Docker Builds? - How-To Geek
Multi-stage | Docker Docs
NEW QUESTION # 66
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