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Docker has become a popular platform for containerization and is widely used by developers and organizations alike. As the use of Docker continues to grow, the need for certified professionals who are well-versed in Docker technologies has increased. The Docker Certified Associate (DCA) certification exam is designed to test the skills and knowledge of individuals who work with Docker technologies.

The DCA exam is designed for professionals who are involved in software development, IT operations, and DevOps. DCA Exam covers a wide range of topics, including Docker architecture, Docker installation and configuration, Docker networking, Docker security, Docker images and containers, Docker orchestration, and Docker storage. Candidates who pass the DCA exam are able to demonstrate their proficiency in all these areas.

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Docker Certified Associate (DCA) exam is designed for IT professionals who want to demonstrate their expertise in working with Docker container technology. Docker is an open-source platform for developing, deploying, and running applications in containers. The DCA Exam is a certification program that validates an individual's knowledge and skills in using Docker technology. It is an industry-recognized credential that demonstrates your proficiency in managing and deploying Docker containers.

Docker Certified Associate (DCA) Exam Sample Questions (Q183-Q188):

NEW QUESTION # 183
You want to create a container that is reachable from its host's network.
Does this action accomplish this?
Solution.Use either EXPOSE or -publish to access the container on the bridge network.

A. Yes
B. No

Answer: B

Explanation:
Explanation
Using either EXPOSE or -publish to access the container on the bridge network will not accomplish the goal of creating a container that is reachable from its host's network. EXPOSE is a way of documenting which ports a container listens on, but it does not open any ports to the host1. -publish (or -p) is a way of mapping a host port to a container port, but it does not change the network mode of the container2. By default, Docker containers use the bridge network, which isolates them from the host network3. To create a container that is reachable from its host's network, you need to use the --network host option when running the container4. This will make the container share the host's network stack and have the same IP address as the host4. References:
* 1: Difference Between "expose" and "publish" in Docker | Baeldung on Ops
* 2: Deploy services to a swarm | Docker Docs
* 3: Bridge network | Docker Docs
* 4: Host network | Docker Docs

NEW QUESTION # 184
Which docker run` flag lifts cgroup limitations?

A. `docker run -cap-drop
B. `docker run -cpu-period
C. `docker run -privileged
D. `docker run -isolation

Answer: C

Explanation:
The --privileged flag lifts all the cgroup limitations for a container, as well as other security restrictions imposed by the Docker daemon1. This gives the container full access to the host's devices, resources, and capabilities, as if it was running directly on the host2. This can be useful for certain use cases that require elevated privileges, such as running Docker-in-Docker or debugging system issues3. However, using the
--privileged flag also poses a security risk, as it exposes the host to potential attacks or damages from the container4. Therefore, it is not recommended to use the --privileged flag unless absolutely necessary, and only with trusted images and containers.
The other options are not correct because they do not lift all the cgroup limitations for a container, but only affect specific aspects of the container's resource allocation or isolation:
*The --cpu-period flag sets the CPU CFS (Completely Fair Scheduler) period for a container, which is the length of a CPU cycle in microseconds. This flag can be used in conjunction with the --cpu-quota flag to limit the CPU time allocated to a container. However, this flag does not affect other cgroup limitations, such as memory, disk, or network.
*The --isolation flag sets the isolation technology for a container, which is the mechanism that separates the container from the host or other containers. This flag is only available on Windows containers, and can be used to choose between process, hyperv, or process-isolated modes. However, this flag does not affect the cgroup limitations for a container, but only the level of isolation from the host or other containers.
*The --cap-drop flag drops one or more Linux capabilities for a container, which are the privileges that a process can use to perform certain actions on the system. This flag can be used to reduce the attack surface of a container by removing unnecessary or dangerous capabilities. However, this flag does not affect the cgroup limitations for a container, but only the capabilities granted to the container by the Docker daemon.
References:
*Runtime privilege and Linux capabilities
*Docker Security: Using Containers Safely in Production
*Docker run reference
*Docker Security: Are Your Containers Tightly Secured to the Ship? SlideShare
*[Secure Engine]
*[Configure a Pod to Use a Limited Amount of CPU]
*[Limit a container's resources]
*[Managing Container Resources]
*[Isolation modes]
*[Windows Container Isolation Modes]
*[Windows Container Version Compatibility]
*[Docker and Linux Containers]
*[Docker Security Cheat Sheet]
*[Docker Security: Using Containers Safely in Production]

NEW QUESTION # 185
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:
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 # 186
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object.
Does this command display it?
Solution: kubectl describe deployment api

A. No
B. Yes

Answer: B

Explanation:
Explanation
= The command kubectl describe deployment api displays the events table for the deployment object called api, along with other information such as labels, replicas, strategy, conditions, and pod template. The events table shows the history of actions that have affected the deployment, such as scaling, updating, or creating pods. This can help troubleshoot any issues with the deployment. To see only the events table, you can use the flag --show-events=true with the command. References:
* Deployments | Kubernetes
* kubectl - How to describe kubernetes resource - Stack Overflow
* Kubectl: Get Deployments - Kubernetes - ShellHacks
* kubernetes - Kubectl get deployment yaml file - Stack Overflow

NEW QUESTION # 187
What is the difference between the ADD and COPY dockerfile instructions? (choosen 2)

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

Answer: D

NEW QUESTION # 188
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