TEST DCA QUESTION - DCA VALID BRAINDUMPS PPT

Test DCA Question - DCA Valid Braindumps Ppt

Test DCA Question - DCA Valid Braindumps Ppt

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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) certification exam is an important certification for IT professionals who work with Docker container technology. Docker Certified Associate (DCA) Exam certification validates the knowledge and skills of the candidates in various areas such as Docker architecture, installation and configuration, Docker networking, security, and troubleshooting. Docker Certified Associate (DCA) Exam certification is globally recognized and helps the individuals to advance their career in the field of Docker container technology.

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Docker Certified Associate (DCA) Exam Sample Questions (Q172-Q177):

NEW QUESTION # 172
Is this a function of UCP?
Solution: scans images to detect any security vulnerability

  • A. No
  • B. Yes

Answer: A


NEW QUESTION # 173
Which networking drivers allow you to enable multi-host network connectivity between containers?

  • A. bridge, user-defined, host
  • B. host, macvlan, overlay, user-defined
  • C. bridge, macvlan, ipvlan, overlay
  • D. macvlan, ipvlan, and overlay

Answer: C

Explanation:
The networking drivers that allow you to enable multi-host network connectivity between containers are bridge, macvlan, ipvlan, and overlay. These drivers create networks that can span multiple Docker hosts, and therefore enable containers on different hosts to communicate with each other. The other drivers, such as host, user-defined, and none, create networks that are either isolated or limited to a single host. Here is a brief overview of each driver and how it supports multi-host networking:
* bridge: The bridge driver creates a network that connects containers on the same host using a Linux bridge. However, it can also be used to create a network that connects containers across multiple hosts using an external key-value store, such as Consul, Etcd, or ZooKeeper. This feature is deprecated and not recommended, as it requires manual configuration and has some limitations. The preferred driver for multi-host networking is overlay1.
* macvlan: The macvlan driver creates a network that assigns a MAC address to each container, making it appear as a physical device on the network. This allows the containers to communicate with other devices on the same network, regardless of the host they are running on. The macvlan driver can also use 802.1q trunking to create sub-interfaces and isolate traffic between different networks2.
* ipvlan: The ipvlan driver creates a network that assigns an IP address to each container, making it appear as a logical device on the network. This allows the containers to communicate with other devices on the same network, regardless of the host they are running on. The ipvlan driver can also use different modes, such as l2, l3, or l3s, to control the routing and isolation of traffic between different networks3.
* overlay: The overlay driver creates a network that connects multiple Docker daemons together using VXLAN tunnels. This allows the containers to communicate across different hosts, even if they are on different networks. The overlay driver also supports encryption, load balancing, and servicediscovery. The overlay driver is the default and recommended driver for multi-host networking, especially for Swarm services4.
Reference:
* Use bridge networks
* Use macvlan networks
* Use ipvlan networks
* Use overlay networks


NEW QUESTION # 174
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages

  • A. No
  • B. Yes

Answer: B

Explanation:
Explanation
Multi-stage builds are a feature of Docker that allows you to use multiple FROM statements in your Dockerfile. Each FROM statement creates a new stage of the build, which can use a different base image and run different commands. You can then copy artifacts from one stage to another, leaving behind everything you don't want in the final image. This optimizes the image size and reduces the attack surface by removing unnecessary dependencies and tools. For example, you can use a stage to compile your code, and then copy only the executable file to the final stage, which can use a minimal base image like scratch. This way, you don't need to include the compiler or the source code in the final image. References:
* Multi-stage builds | Docker Docs
* What Are Multi-Stage Docker Builds? - How-To Geek
* Multi-stage | Docker Docs


NEW QUESTION # 175
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate?
Solution. Set and export the IGNORE_TLS environment variable on the command line.

  • A. No
  • B. Yes

Answer: A

Explanation:
= Setting and exporting the IGNORE_TLS environment variable on the command line is not a way to configure the Docker engine to use a registry without a trusted TLS certificate. This environment variable is not recognized by Docker and has no effect on the TLS verification process1. To use a registry without a trusted TLS certificate, you need to either add the certificate to the system or Docker-specific trust store, or configure the Docker daemon to allow insecure registries23. References:
* Environment variables | Docker Docs
* Verify repository client with certificates | Docker Docs
* Test an insecure registry | Docker Docs


NEW QUESTION # 176
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker service create myorg/myimage:1.0

  • A. No
  • B. Yes

Answer: B

Explanation:
When content trust is enabled, Docker blocks any command that operates on unsigned images, such as docker service create. This is because Docker Content Trust (DCT) allows users to verify the integrity and publisher of specific image tags, using digital signatures stored on a Notary server. If an image tag is not signed, or the signature cannot be verified, Docker will refuse to pull, run, or build with that image. Therefore, if myorg/myimage:1.0 is unsigned, Docker will block the command docker service create myorg/myimage:1.0 and display an error message. Reference:
Content trust in Docker
Docker Content Trust: What It Is and How It Secures Container Images
Automation with content trust


NEW QUESTION # 177
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