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  2. Docker Certification
  3. DCA Exam
  4. Docker.DCA.v2024-05-09.q158 Dumps
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Question 101

A service 'wordpress' is running using a password string to connect to a non-Dockerized database service. The password string is passed into the 'wordpress' service as a Docker secret. Per security policy, the password on the database was changed. Identity the correct sequence of steps to rotate the secret from the old password to the new password.

Correct Answer: C
insert code

Question 102

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

Correct Answer: A
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
insert code

Question 103

How do you change the default logging driver for the docker daemon in Linux?

Correct Answer: D
insert code

Question 104

Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: user authorization to the Docker API

Correct Answer: B
Explanation
= The role of Control Groups (cgroups) when used with a Docker container is not user authorization to the Docker API. Cgroups are a feature of the Linux kernel that allow you to limit the access processes and containers have to system resources such as CPU, RAM, IOPS and network1. Cgroups enable Docker to share available hardware resources to containers and optionally enforce limits and constraints2. User authorization to the Docker API is a different concept that involves granting permissions to users or groups to perform certain actions on the Docker daemon, such as creating, running, or stopping containers3.
References:
* Lab: Control Groups (cgroups) | dockerlabs
* Runtime metrics | Docker Docs
* Authorize users to access the Docker API | Docker Docs
I hope this helps you understand the role of cgroups and how they work with Docker containers. If you have any other questions related to Docker, please feel free to ask me.
insert code

Question 105

You have created a Docker bridge network on a host with three containers attached, how do you make this containers accessible outside of the host?

Correct Answer: D
insert code
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