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Docker Certified Associate (DCA) certification exam is a globally recognized certification that validates the knowledge and skills of professionals in using Docker Enterprise Edition (EE) and Docker Community Edition (CE) for containerization. Docker Certified Associate (DCA) Exam certification is designed to help IT professionals and developers to showcase their proficiency in Docker technologies and to demonstrate their ability to use Docker to build, ship, and run containerized applications.
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The DCA certification exam is a valuable credential for professionals who work with Docker technologies. Docker Certified Associate (DCA) Exam certification validates an individual's knowledge and skills related to Docker and can lead to better job opportunities and higher salaries. Additionally, the DCA Certification is recognized by many organizations and can help professionals stand out in a crowded market.
Docker Certified Associate (DCA) Exam Sample Questions (Q105-Q110):
NEW QUESTION # 105
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
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 # 106
Will this command list all nodes in a swarm cluster from the command line?
Solution. 'docker inspect nodes
Answer: A
Explanation:
= The command docker inspect nodes will not list all nodes in a swarm cluster from the command line. This command is invalid, as docker inspect requires one or more object names or IDs as arguments1. To list all nodes in a swarm cluster, you need to use the docker node ls command from a manager node2. This command will display the ID, hostname, status, availability, manager status, and engine version of each node in the swarm2. You can also use the -f or --filter flag to filter the nodes by various criteria, such as role, label, or name2. Reference:
1: docker inspect | Docker Docs
2: docker node ls | Docker Docs
NEW QUESTION # 107
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run --add-volume /data /mydata -read-only ubuntu'
Answer: A
NEW QUESTION # 108
One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: The unhealthy container is restarted.
Answer: A
NEW QUESTION # 109
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Network
Answer: A
Explanation:
Network is a type of Linux kernel namespace that provides container isolation. Network namespaces isolate the system resources associated with networking, such as network interfaces, IP addresses, routing tables, firewall rules, etc. Each network namespace has its own virtual network stack, and processes in different network namespaces can communicate through virtual network devices or tunnels1. Network namespaces are used by Docker to create isolated networks for containers, and allow users to customize the network configuration and connectivity of each container2. Reference:
network_namespaces(7) - Linux manual page
Docker network overview | Docker Documentation
NEW QUESTION # 110
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