Quality DCA PDF Dumps - DCA Exam Questions
Most UptoDate Docker DCA Exam Dumps PDF 2024
The DCA certification exam is a comprehensive test that evaluates a candidate's understanding of Docker technologies, including Docker architecture, installation and configuration, image creation, networking, security, and troubleshooting. It is an online, proctored exam that can be taken from anywhere in the world, making it accessible to a wide range of professionals.
Docker Certified Associate (DCA) Certification Exam is a globally recognized certification program that validates the technical knowledge and skills required of Docker practitioners. Docker Certified Associate (DCA) Exam certification is offered by Docker, the popular containerization platform that enables developers to build, ship, and run containerized applications quickly and efficiently. The DCA certification exam is designed to test the knowledge and practical skills of Docker practitioners and managers to enable them to effectively work with and manage containerized applications.
Docker Certified Associate (DCA) exam is an industry-recognized certification that validates an individual’s knowledge and skills in managing and deploying Docker containers. DCA exam covers a wide range of topics related to Docker and its related technologies, including container networking, image creation and management, container orchestration, and security. Docker Certified Associate (DCA) Exam certification is highly valued in the industry and can lead to higher salaries and promotions. Candidates can prepare for the exam by taking advantage of Docker’s training courses and resources or by using third-party study materials.
NEW QUESTION # 42
Will a DTR security scan detect this?
Solution: licenses for known third party binary components
- A. Yes
- B. No
Answer: B
NEW QUESTION # 43
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. Yes
- B. No
Answer: A
Explanation:
Explanation
= Provisioning a Docker config object for each environment is a way to provision configuration to containers at runtime. Docker configs allow services to adapt their behaviour without the need to rebuild a Docker image.
Services can only access configs when explicitly granted by a configs attribute within the services top-level element. As with volumes, configs are mounted as files into a service's container's filesystem1. Docker configs are supported on both Linux and Windows services2. References: Docker Documentation, Configs top-level element
NEW QUESTION # 44
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution.Run docker engine activate.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Running docker engine activate will upgrade Docker Engine CE to Docker Engine EE. This is a feature that allows you to switch from the Community Edition to the Enterprise Edition without reinstalling Docker or losing any data. You need to have a valid license file and a subscription to Docker EE to use this feature1. Docker EE is a premium version of Docker CE that offers additional features, such as security scanning, image management, and certified plugins23. References:
* Upgrade Docker Engine | Docker Docs
* What is the exact difference between Docker EE (Enterprise Edition), Docker CE (Community Edition) and Docker (Custom Support) - Stack Overflow
* Docker Community Edition or Docker Enterprise Edition - Docker | BoxBoat
NEW QUESTION # 45
Is this an advantage of multi-stage builds?
Solution: simultaneously creates and tags multiple images
- A. Yes
- B. No
Answer: B
NEW QUESTION # 46
Which of the following commands starts a Redis container and configures it to always restart unless it is explicitly stopped or Docker is restarted?
- A. 'docker run -d --failure omit-stopped redis'
- B. 'docker run -d --restart unless-stopped redis'
- C. 'docker run -d --restart-policy unless-stopped redis'
- D. 'docker run -d --restart omit-stopped redis'
Answer: C
NEW QUESTION # 47
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?
Solution: Set IGNORE_TLS in the 'daemon.json' configuration file.
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
= This is not a way to configure the Docker engine to use a registry without a trusted TLS certificate. There is no such option as IGNORE_TLS in the daemon.json configuration file. The daemon.json file is used to configure various aspects of the Docker engine, such as logging, storage, networking, and security1. To use a registry without a trusted TLS certificate, you need to either add the certificate to the trusted root certificates of the system, or configure the Docker engine to allow insecure registries2. To add the certificate to the trusted root certificates, you need to copy the certificate file to the /etc/docker/certs.d/<registry-hostname>/ directory on every Docker host2. To configure the Docker engine to allow insecure registries, you need to add the registry hostname or IP address to the "insecure-registries" array in the daemon.json file3. For example:
{ "insecure-registries" : ["myregistry.example.com:5000"] }
Note that using insecure registries is not recommended, as it exposes you to potential man-in-the-middle attacks and data corruption3. You should always use a registry with a trusted TLS certificate, or use Docker Content Trust to sign and verify your images4. References:
* Daemon configuration file | Docker Docs
* Verify repository client with certificates | Docker Docs
* Test an insecure registry | Docker Docs
* Content trust in Docker | Docker Docs
NEW QUESTION # 48
Is this a supported user authentication method for Universal Control Plane?
Solution.x.500
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
x.500 is not a supported user authentication method for Universal Control Plane (UCP). UCP supports two types of user authentication methods: built-in and external1. Built-in authentication uses the UCP's own database to store and verify user credentials. External authentication uses an external LDAP or Active Directory service to manage user accounts and passwords1. x.500 is a standard for directory services, which can be used by LDAP or Active Directory, but it is not a user authentication method by itself2. References:
* User authentication | Docker Docs
* X.500 - Wikipedia
NEW QUESTION # 49
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 containers on the bridge network
- A. Yes
- B. No
Answer: A
NEW QUESTION # 50
The following Docker Compose file is deployed as a stack:
Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
= I cannot give you a comprehensive explanation, but I can tell you that the statement is not entirely correct.
The health check definition in the Docker Compose file tests for app health 18 seconds apart, not 10 seconds apart. Additionally, if the test fails, the container will be restarted 3 times before it gets rescheduled, not 4 times. References:
* Docker Associate Resources and guides: 1 and 2
* Docker Compose health check documentation: 3
* Docker health check documentation: 4
I hope this helps you prepare for your DCA exam. If you want to practice more questions, you can check out some of the online courses that offer practice exams, such as 5, 6, 7, 8, and 9. Good luck!
NEW QUESTION # 51
A container named "analytics" that stores results in a volume called "data" was created.
docker run -d --name=analytics -v data:/data app1
How are the results accessed in "data" with another container called "app2"?
- A. docker run -d --name=reports --volume=app1 app2
- B. docker run -d --name=reports --volumes-from=analytics app2
- C. docker run -d --name=reports --mount=app1 app2
- D. docker run -d --name=reports --volume=data app2
Answer: B
NEW QUESTION # 52
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. Yes
- B. No
Answer: B
Explanation:
Explanation
= Distributing seven managers across three datacenters or availability zones as 3-2-2 is not a good way to ensure high availability and fault tolerance. This is because a swarm cluster requires a majority of managers (more than half) to be available and able to communicate with each other in order to maintain the swarm state and avoid a split-brain scenario1. If one of the datacenters or availability zones with three managers goes down, the remaining four managers will not have a quorum and the swarm will stop functioning. A better way to distribute seven managers across three datacenters oravailability zones is 3-3-1 or 3-2-1-1, which will allow the swarm to survive the loss of one or two datacenters or availability zones, respectively2. References:
* Administer and maintain a swarm of Docker Engines | Docker Docs
* How to Create a Cluster of Docker Containers with Docker Swarm and DigitalOcean on Ubuntu 16.04 | DigitalOcean
NEW QUESTION # 53
Will this command list all nodes in a swarm cluster from the command line?
Solution. 'docker inspect nodes
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
The command docker inspect nodes will not list all nodes in a swarm cluster from the command line. This is because docker inspect requires one or more names or IDs of the objects to inspect1. To list all nodes in a swarm cluster, you need to use the command docker node ls2, which will display information such as node ID, hostname, status, availability, and role3. References:
* docker inspect | Docker Docs
* docker node ls | Docker Docs
* How to list nodes in a Docker swarm cluster
NEW QUESTION # 54
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
Explanation:
Explanation
Using docker logs <container-id> does not configure a Docker container to export container logs to the logging solution. The docker logs command shows information logged by a running container, such as standard output and standard error streams. It does not send or export container logs to any external service.
References: https://docs.docker.com/engine/reference/commandline/logs/,
https://docs.docker.com/config/containers/logging/
NEW QUESTION # 55
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: Set the log-driver and log-oPt keys to values for the logging solution (Splunk) In the daemon.json file.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Setting the log-driver and log-opt keys to values for the logging solution (Splunk) in the daemon.json file will configure a Docker container to export container logs to the logging solution. This is because the Splunk logging driver sends container logs to the HTTP Event Collector in Splunk Enterprise and Splunk Cloud1. To use the Splunk driver as the default logging driver, set the keys log-driver and log-opts to appropriate values in the daemon.json configuration file and restart Docker1. To use the Splunk driver for a specific container, use the commandline flags --log-driver and log-opt with docker run1. The Splunk logging driver supports various options, such as splunk-token, splunk-url, splunk-source, splunk-sourcetype, splunk-index, etc1. References:
Splunk logging driver | Docker Docs1
NEW QUESTION # 56
Will this configuration achieve fault tolerance for managers in a swarm?
Solution: only two managers, one active and one passive.
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
This configuration will not achieve fault tolerance for managers in a swarm, because having only two managers creates a risk of losing quorum if one manager fails or becomes unavailable. According to the official documentation, having two managers also does not provide any benefits over having one manager, since both managers must be available for any management operations.
References: https://docs.docker.com/engine/swarm/admin_guide/#add-manager-nodes-for-fault-tolerance
NEW QUESTION # 57
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?
Solution: Pass the '--insecure-registry' flag to the daemon at run time.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Passing the '-insecure-registry' flag to the daemon at run time is a way to configure the Docker engine to use a registry without a trusted TLS certificate. According to the official documentation, this flag allows access to registries that have invalid or self-signed certificates.
References: https://docs.docker.com/registry/insecure/
NEW QUESTION # 58
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-3-1
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
= Distributing seven managers across three datacenters or availability zones as 3-3-1 is not the best way to ensure high availability and fault tolerance. This is because if one of the datacenters with three managers fails, the remaining four managers will not have a quorum to elect a leader and continue the swarm operations. A quorum is the minimum number of managers that must be available to maintain the swarm state, and it is calculated as (N/2) + 1, where N is the total number of managers1. For seven managers, the quorum is five, so losing three managers will cause the swarm to lose the quorum. A better way to distribute seven managers across three datacenters or availability zones is 2-2-3, which will allow the swarm to survive the failure of any one datacenter2. References:
* Administer and maintain a swarm of Docker Engines
* Distribute manager nodes across multiple AZ
NEW QUESTION # 59
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 # 60
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. Yes
- B. No
Answer: A
NEW QUESTION # 61
Is this the purpose of Docker Content Trust?
Solution. Sign and verify image tags.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Signing and verifying image tags is the purpose of Docker Content Trust. Docker Content Trust (DCT) is a feature that allows you to use digital signatures for data sent to and received from remote Docker registries.
These signatures allow client-side or runtime verification of the integrity and publisher of specific image tags.
With DCT, image publishers can sign their images and image consumers can ensure that the images they pull are signed. References: https://docs.docker.com/engine/security/trust/
NEW QUESTION # 62
Is this the purpose of Docker Content Trust?
Solution: Verify and encrypt Docker registry TLS.
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
Docker Content Trust (DCT) is a feature that allows users to verify the integrity and publisher of container images they pull or deploy from a registry server, signed on a Notary server12. DCT does not verify or encrypt the Docker registry TLS, which is a separate mechanism for securing the communication between the Docker client and the registry server. The purpose of DCT is to ensure that the images are not tampered with or maliciously modified by anyone other than the original publisher3. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* Automation with content trust | Docker Docs
NEW QUESTION # 63
Can this set of commands identify the published port(s) for a container?
Solution: docker container inspect', 'docker port'
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
This set of commands can identify the published port(s) for a container, because docker container inspect can show the port mappings for a container and docker port can list the public port that is NAT-ed to the private port. According to the official documentation, these commands can be used to find the exposed ports for a container.
References: https://docs.docker.com/engine/reference/commandline/container_inspect/
https://docs.docker.com/engine/reference/commandline/port/
NEW QUESTION # 64
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 config file for each environment.
- B. Create images that contain the specific configuration for every environment.
- C. Create a Dockerfile for each environment, specifying ports and Docker secrets for certificates.
- D. Create a Dockerfile for each environment, specifying ports and ENV variables for certificates.
Answer: A
NEW QUESTION # 65
Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker node Is'
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Using 'docker node ls' lists all nodes in a swarm cluster from the command line. The docker node command is used to manage nodes in a swarm. The docker node ls subcommand displays information about the nodes in the swarm, such as their ID, hostname, status, availability, and role. References:
https://docs.docker.com/engine/reference/commandline/node/,
https://docs.docker.com/engine/reference/commandline/node_ls/
NEW QUESTION # 66
Will this command display a list of volumes for a specific container?
Solution: 'docker container inspect nginx'
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
= The command docker container inspect nginx will display a list of volumes for the specific container named nginx. The output of the command will include a section called "Mounts" that shows the source, destination, mode, type, and propagation of each volume mounted in the container1. For example, the following output shows that the container nginx has two volumes: one is a bind mount from the host's /var/log/nginx directory to the container's /var/log/nginx directory, and the other is an anonymous volume created by Docker at
/var/lib/docker/volumes/... and mounted to the container's /etc/nginx/conf.d directory2.
"Mounts": [
{
"Type": "bind",
"Source": "/var/log/nginx",
"Destination": "/var/log/nginx",
"Mode": "rw",
"RW": true,
"Propagation": "rprivate"
},
{
"Type": "volume",
"Name": "f6eb3dfdd57b7e632f6329a6d9bce75a1e8ffdf94498e5309c6c81a87832c28d",
"Source":
"/var/lib/docker/volumes/f6eb3dfdd57b7e632f6329a6d9bce75a1e8ffdf94498e5309c6c81a87832c28d/_data",
"Destination": "/etc/nginx/conf.d",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
]
References:
* docker container inspect
* List volumes of Docker container
NEW QUESTION # 67
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