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The DCA certification exam is designed for IT professionals, developers, and system administrators who work with Docker. Candidates who pass the exam demonstrate their ability to use Docker to build, ship, and run applications in containers. DCA exam covers a range of topics, including Docker basics, Dockerfile and image creation, container orchestration with Docker Swarm, and Docker networking and security.

The DCA Exam is recognized by the industry as a valuable certification for IT professionals who work with Docker. Employers look for candidates who hold the DCA credential as it demonstrates their knowledge and skills in Docker. Docker Certified Associate (DCA) Exam certification is also beneficial for IT professionals who want to advance their careers in DevOps, cloud computing, and containerization. The DCA Exam is a valuable investment for IT professionals who want to enhance their skills and demonstrate their expertise in Docker.

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Docker Certified Associate (DCA) Exam Sample Questions (Q126-Q131):

NEW QUESTION # 126
A user's attempts to set the system time from inside a Docker container are unsuccessful.
Could this be blocking this operation?
Solution.SELinux

• A. No
• B. Yes

Answer: B

Explanation:
SELinux could be blocking the operation of setting the system time from inside a Docker container. SELinux is a security mechanism that enforces mandatory accesscontrol (MAC) policies on Linux systems. It restricts the actions that processes can perform based on their security contexts, such as user, role, type, and level. By default, SELinux prevents Docker containers from accessing or modifying the host's system time, as this could pose a security risk or cause inconsistency. To allow Docker containers to set the system time, SELinux needs to be configured with the appropriate permissions or labels, or disabled altogether. However, this is not recommended, as it could compromise the security and stability of the system. Reference:
Change system date time in Docker containers without impacting host
Change Date Inside a Docker Container
How to Handle Timezones in Docker Containers
5 ways to change time in Docker container
How to set system time dynamically in a Docker container

 

NEW QUESTION # 127
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'

• A. No
• B. Yes

Answer: A

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 # 128
Is this a type of Linux kernel namespace that provides container isolation?
Solution.Process ID

• A. No
• B. Yes

Answer: B

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. Reference: Namespaces in operation), pid_namespaces), What is a PID namespace?, Linux Namespaces: PID)

 

NEW QUESTION # 129
Two development teams in your organization use Kubernetes and want to deploy their applications while ensuring that Kubernetes-specific resources, such as secrets, are grouped together for each application.
Is this a way to accomplish this?
Solution: Create one pod and add all the resources needed for each application

• A. No
• B. Yes

Answer: A

Explanation:
Explanation
Creating one pod and adding all the resources needed for each application is not a good way to accomplish the goal of grouping Kubernetes-specific resources for each application. This is because pods are the smallest unit of a Kubernetes application, and they are designed to run a single container or a set of tightly coupled containers that share the same network and storage resources1. Pods are ephemeral and can be created and destroyed by the Kubernetes system at any time. Therefore, putting multiple applications in one pod would make them harder to manage, scale, and update independently. A better way to accomplish the goal is to use namespaces, which are logicalclusters within a physical cluster that can isolate resources, policies, and configurations for different applications2. Namespaces can also help organize secrets, which are Kubernetes objects that store sensitive information such as passwords, tokens, and keys3. References:
* Pods | Kubernetes
* Namespaces | Kubernetes
* Secrets | Kubernetes

 

NEW QUESTION # 130
Your organization has a centralized logging solution, such as Splunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution: docker logs <container-id>

• A. No
• B. Yes

Answer: A

Explanation:
= The command docker logs <container-id> will not configure a Docker container to export container logs to the logging solution, such as Splunk. This command only displays the logs of a specific container in the standard output or a file, but does not send them to any external system1. To export container logs to Splunk, you need to use the Docker Logger Drivers, which are plugins that provide logging capabilities for Docker containers2. The Splunk logging driver sends container logs to HTTP Event Collector in Splunk Enterprise and Splunk Cloud3. To use the Splunk logging driver for a specific container, you need to use the command-line flags --log-driver and --log-opt with docker run, and provide the Splunk token and URL as options3. For example:
$ docker run --log-driver=splunk --log-opt splunk-token=VALUE --log-opt splunk-url=VALUE ...
:
docker logs | Docker Documentation
Logging drivers | Docker Documentation
Splunk logging driver | Docker Documentation

 

NEW QUESTION # 131
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