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Docker Certified Associate (DCA) Exam Sample Questions (Q143-Q148):

NEW QUESTION # 143
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay -o encrypted=true <network-name>

A. No
B. Yes

Answer: B

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 # 144
In the context of a swarm mode cluster, does this describe a node?
Solution.an instance of the Docker CLI connected to the swarm

A. Yes
B. No

Answer: B

Explanation:
Explanation
The statement does not describe a node in the context of a swarm mode cluster. A node is a physical or virtual machine running Docker Engine 1.12 or later in swarm mode1. An instance of the Docker CLI connected to the swarm is not a node, but a client that can interact with the swarm through the Docker API2. The Docker CLI can be used to create a swarm, join nodes to a swarm, deploy services to a swarm, and manage swarm behavior3. References: How nodes work), Docker CLI), Swarm mode overview)

NEW QUESTION # 145
Which of the following is true about using the '-P' option when creating a new container?

A. Docker binds each exposed container port with the same port on the host
B. Docker gives extended privileges to the container.
C. Docker binds each exposed container port to a random port on a specified host interface
D. Docker binds each exposed container port to a random port on all the host's interface

Answer: D

NEW QUESTION # 146
Is this statement correct?
Solution: A Dockerfile provides instructions for building a Docker image

A. No
B. Yes

Answer: B

Explanation:
A Dockerfile is a text file that contains all the commands a user could run on the command line to create an image1. A Dockerfile is composed of instructions that specify the parent image, the packages to install, the files to copy, the ports to expose, and the commands to run2. A Dockerfile can be used to build a Docker image with the docker build command3. Reference:
Dockerfile reference | Docker Docs
What is a Dockerfile? A Step-by-Step Guide [2023 Updated] - Simplilearn How to Build Docker Images with Dockerfile | Linuxize

NEW QUESTION # 147
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Uninstall 'docker-ce' package before installing 'docker-ee' package.

A. No
B. Yes

Answer: B

Explanation:
Explanation
Uninstalling 'docker-ce' package before installing 'docker-ee' package does upgrade Docker Engine CE to Docker Engine EE. Docker Engine CE is the free and open source edition of Docker Engine, while Docker Engine EE is the enterprise-ready edition that includes additional features and support. To upgrade from CE to EE, you need to uninstall the 'docker-ce' package and its dependencies, and then install the 'docker-ee' package from the Docker repository. References:
https://docs.docker.com/engine/install/centos/#upgrade-docker-after-using-the-convenience-script,
https://docs.docker.com/engine/install/centos/#install-using-the-repository

NEW QUESTION # 148
......

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