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Docker Certified Associate (DCA) Certification Exam is an essential certification for IT professionals seeking to validate their skills and knowledge in Docker technologies and practices. DCA exam covers a broad range of topics related to Docker, and successful completion of the exam demonstrates an individual's proficiency in this field. If you are a Docker professional looking to validate your expertise, the DCA Certification is a must-have.

Docker Certified Associate (DCA) Exam Sample Questions (Q142-Q147):

NEW QUESTION # 142
What is the purpose of multi-stage builds?

A. Optimizing images by copying artifacts selectively from previous stages
B. Better caching when building Docker images
C. Better logical separation of Dockerfile instructions for better readability
D. Faster image builds by allowing parallel execution of Docker builds

Answer: A

NEW QUESTION # 143
Is this a type of Linux kernel namespace that provides container isolation?
Solution. Process ID

A. Yes
B. No

Answer: A

Explanation:
Process ID is a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that isolate and virtualize system resources of a collection of processes1. Process ID namespace isolates the process ID number space, meaning that processes in different PID namespaces can have the same PID2. This allows each container to have its own init process with PID 1, which is the ancestor of all other processes in the container3. Process ID namespace also affects other identifiers, such as thread IDs, parent process IDs, and session IDs4. References: Namespaces in operation), pid_namespaces), What is a PID namespace?, Linux Namespaces: PID)

NEW QUESTION # 144
What is the difference between the ADD and COPY dockerfile instructions? (choosen 2)

A. ADD supports compression format handling while COPY does not.
B. ADD supports regular expression handling while COPY does not.
C. ADD support remote URL handling while COPY does not.
D. COPY supports compression format handling while ADD does not.
E. COPY supports regular expression handling while ADD does not.

Answer: C

NEW QUESTION # 145
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay -o encrypted=true <network-name>

A. Yes
B. No

Answer: A

Explanation:
Explanation
The command docker network create -d overlay -o encrypted=true <network-name> will ensure that overlay traffic between service tasks is encrypted. This command creates an overlay network with the encryption option enabled, which means that Docker will create IPSEC tunnels between all the nodes where tasks are scheduled for services attached to the overlay network. These tunnels use the AES algorithm in GCM mode and manager nodes automatically rotate the keys every 12 hours1. This way, the data exchanged between containers on different nodes on the overlay network is secured. References:
* Overlay network driver

NEW QUESTION # 146
Will This command list all nodes in a swarm cluster from the command line?
Solution. 'docker swarm nodes'

A. No
B. Yes

Answer: A

Explanation:
Explanation
This command does not list all nodes in a swarm cluster from the command line. The docker swarm command manages swarm operations, such as initializing or joining a swarm, updating the swarm configuration, etc. It does not show information about nodes or services. To list all nodes in a swarm cluster from the command line, you need to use docker node ls command. This command shows information about all the nodes that are part of the swarm, such as their ID, hostname, status, availability, etc. References:
https://docs.docker.com/engine/reference/commandline/swarm/,
https://docs.docker.com/engine/reference/commandline/node_ls/

NEW QUESTION # 147
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