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Docker Certified Associate (DCA) exam is a valuable certification for IT professionals who want to demonstrate their skills and knowledge in Docker technology. Docker Certified Associate (DCA) Exam certification program is recognized by industry leaders and can help individuals advance their careers and increase their earning potential. By passing the DCA exam, IT professionals can show that they are proficient in Docker technology and are capable of working with Docker technology in real-world scenarios.
The DCA certification is a valuable asset for IT professionals who want to demonstrate their proficiency in Docker. It provides an objective measure of their skills and knowledge, which can be used to enhance their professional credibility and advance their careers. Docker Certified Associate (DCA) Exam certification also provides access to a global community of Docker experts and resources, which can be leveraged to stay up-to-date with the latest trends and best practices in the field. Overall, the DCA Certification is an excellent way for IT professionals to validate their expertise in Docker and differentiate themselves in a competitive job market.
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Docker Certified Associate (DCA) Exam Sample Questions (Q10-Q15):
NEW QUESTION # 10
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. No
- B. Yes
Answer: A
Explanation:
Explanation
This is not how they should be distributed across three datacenters or availability zones, because having one manager in one datacenter or availability zone creates a single point of failure and reduces the fault tolerance of the swarm. According to the official documentation, managers should be distributed evenly across datacenters or availability zones to ensure that the swarm can survive the loss of any one datacenter or availability zone.
References: https://docs.docker.com/engine/swarm/admin_guide/#add-manager-nodes-for-fault-tolerance
NEW QUESTION # 11
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: inter-process communication
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
(Please check the official Docker site for the verified answer) Comprehensive Explanation: = (Please check the official Docker site for the comprehensive explanation) References: (Some possible references from the web search results are)
* Docker Security - Docker Documentation
* Docker Security Best Practices - Medium
* Docker Security Cheat Sheet - GitHub
* Docker Security: A Comprehensive Guide - Snyk
* Docker Security: Tips and Tricks to Secure Your Containers - DevSecOps I hope this helps you in your exam preparation. Good luck!
NEW QUESTION # 12
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution:docker service create --network --encrypted
- A. No
- B. Yes
Answer: A
Explanation:
= The command docker service create --network --encrypted will not ensure that overlay traffic between service tasks is encrypted. This is because the --network flag requires an argument that specifies the name or ID of the network to connect the service to1. The--encrypted flag is not a valid option for docker service create2. To encrypt overlay traffic between service tasks, you need to use the --opt encrypted flag on docker network create when you create the overlay network3. For example:
docker network create --opt encrypted --driver overlay my-encrypted-network Then, you can use the --network flag on docker service create to connect the service to the encrypted network. For example:
docker service create --network my-encrypted-network my-service
:
docker service create | Docker Documentation
docker service create | Docker Documentation
Manage swarm service networks | Docker Docs
I hope this helps you understand the command and the encryption, and how they work with Docker and swarm. If you have any other questions related to Docker, please feel free to ask me.
NEW QUESTION # 13
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. No
- B. Yes
Answer: A
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 # 14
Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution. Delete the image and remove permissions to the repository in the Docker Trusted Registry.
- A. No
- B. Yes
Answer: A
Explanation:
= The sequence of steps will not completely delete an image from disk in the Docker Trusted Registry.
Deleting the image and removing permissions to the repository will only remove the image from the registry's user interface and prevent unauthorized access to it. However, the image data will still remain on the registry's storage backend until garbage collection is performed1. Garbage collection is a process that removes unused blobs (layers) from the registry's storage2. To run garbage collection, the registry must be stopped and the command bin/registry garbage-collect /etc/docker/registry/config.yml must be executed3. Alternatively, the registry can be configured to run garbage collection automatically at regular intervals4. References:
* Deleting images | Docker Documentation
* Garbage collection | Docker Documentation
* How to delete images from a private docker registry? | Stack Overflow
* Automating garbage collection | Docker Documentation
NEW QUESTION # 15
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