2023 Valid DCA Real Exam Questions, practice Docker Certified Associate
Latest Success Metrics For Actual DCA Exam (Updated 170 Questions)
Individuals who earn the DCA certification demonstrate that they possess the technical knowledge and skills required to run containerized applications using Docker. The certification exam covers a range of topics, including Docker basics, Docker image creation and management, Docker networking, Docker security, and Docker storage management. Candidates also need to possess an understanding of the Docker architecture, Docker command-line interface (CLI), Docker Compose, and Docker swarm mode.
NEW QUESTION # 28
Which command interactively monitors all container activity in the Docker engine?
- A. docker system logs
- B. docker system events
- C. docker container events
- D. docker container logs
Answer: B
NEW QUESTION # 29
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-2-2
- A. No
- B. Yes
Answer: B
NEW QUESTION # 30
Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution: Delete the image and run garbage collection on the Docker Trusted Registry.
- A. Yes
- B. No
Answer: B
NEW QUESTION # 31
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: user
- A. No
- B. Yes
Answer: B
NEW QUESTION # 32
What is the purpose of multi-stage builds?
- A. Faster image builds by allowing parallel execution of Docker builds
- B. Better logical separation of Dockerfile instructions for better readability
- C. Better caching when building Docker images
- D. Optimizing images by copying artifacts selectively from previous stages
Answer: D
NEW QUESTION # 33
A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space.
If every pod on this node has exactly two containers in it, how many pods can this address space support on this node?
- A. 64 for every service routing to pods on this node
- B. 0
- C. 32 In every Kubernetes namespace
- D. 1
Answer: A
NEW QUESTION # 34
Is this a function of UCP?
Solution: scans images to detect any security vulnerability
- A. Yes
- B. No
Answer: B
NEW QUESTION # 35
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: net
- A. Yes
- B. No
Answer: B
NEW QUESTION # 36
A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.
Can this be used to schedule containers to meet the security policy requirements?
Solution: label contraints
- A. Yes
- B. No
Answer: B
NEW QUESTION # 37
How do you configure Docker engine to use a registry that is not configured with TLS certificates from a trusted CA?
- A. Set IGNORE_TLS in the 'daemon.json' configuration file.
- B. Pass the '--insecure.-registry' flag to the daemon at run time
- C. Set INSECURE_REGISTRY in the '/etc/docker/default' configuration file
- D. Set and export the IGNORE_TLS environment variable on the command line
Answer: B
NEW QUESTION # 38
An application image runs in multiple environments, with each environment using different certificates and ports.
Is this a way to provision configuration to containers at runtime?
Solution: Provision a Docker config object for each environment.
- A. No
- B. Yes
Answer: B
NEW QUESTION # 39
An application image runs in multiple environments, and each environment uses different certificates and ports, what is the best practice to deploy the containers?
- A. Create a Dockerfile for each environment, specifying ports and Docker secrets for certificates.
- B. Create a config file for each environment.
- C. Create images that contain the specific configuration for every environment.
- D. Create a Dockerfile for each environment, specifying ports and ENV variables for certificates.
Answer: B
NEW QUESTION # 40
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: accounting and limiting of resources
- A. Yes
- B. No
Answer: B
NEW QUESTION # 41
You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution: 'docker service inspect http'
- A. No
- B. Yes
Answer: B
NEW QUESTION # 42
Which one of the following commands will result in the volume being removed automatically once the container has exited?
- A. 'docker run --read-only -v /foo busybox'
- B. 'docker run --remove -v /foo busybox'
- C. 'docker run --del -v /foo busybox'
- D. 'docker run --rm -v /foo busybox'
Answer: D
NEW QUESTION # 43
During development of an application meant to be orchestrated by Kubernetes, you want to mount the /data directory on your laptop into a container.
Will this strategy successfully accomplish this?
Solution: Create a PersistentVolume with storageciass: "" and hostPath: /data, and a persistentVolumeClaim requesting this PV. Then use that PVC to populate a volume in a pod
- A. No
- B. Yes
Answer: B
NEW QUESTION # 44
You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution: 'docker inspect http'
- A. Yes
- B. No
Answer: B
NEW QUESTION # 45
In the context of a swarm mode cluster, does this describe a node?
Solution: a physical machine participating in the swarm
- A. Yes
- B. No
Answer: B
NEW QUESTION # 46
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay --secure
- A. Yes
- B. No
Answer: B
NEW QUESTION # 47
What service mode is used to deploy a single task of a service to each node?
- A. distributed
- B. universal
- C. replicated
- D. spread
- E. global
Answer: E
NEW QUESTION # 48
A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.
Can this be used to schedule containers to meet the security policy requirements?
Solution: resource reservation
- A. Yes
- B. No
Answer: B
NEW QUESTION # 49
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. Yes
- B. No
Answer: B
NEW QUESTION # 50
What behavior is expected when a service is created with the following command:
'docker service create --publish 8000:80 nginx'
- A. Only a single node in the cluster will listen on port 8080 and forward to port 80 in the
container. - B. All nodes in the cluster will listen on port 8080 and forward to port 80 in the container.
- C. All nodes in the cluster will listen on port 80 and forward to port 8080 in the container.
- D. Only a single node in the cluster will listen on port 80 and forward to port 8080 in the container.
Answer: B
NEW QUESTION # 51
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