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| Certification Vendor: | Docker / Mirantis |
|---|---|
| Exam Name: | Docker Certified Associate Exam |
| Exam Number: | DCA |
| Passing Score: | 65% |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 2 years |
| Exam Price: | $199 USD |
| Real Exam Qty: | 55 |
| Available Languages: | English, Japanese |
| Exam Format: | Multiple Choice (MCQ), Discrete Option Multiple Choice (DOMC) |
| Recommended Training: | Mirantis Official Training |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Docker DCA Sample Questions |
| Exam Way: | Online proctored or onsite testing via Pearson VUE |
| Pre Condition: | No mandatory prerequisites; recommended 6โ12 months hands-on experience with Docker |
| Official Syllabus URL: | https://www.mirantis.com/training-and-certification/docker-certified-associate/ |
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To qualify for the Docker Certified Associate (DCA) exam, candidates must have a solid understanding of Docker technology and its various components. They should also be familiar with the Docker command line interface (CLI) and have experience working with Docker images, containers, and networks. Candidates can prepare for the exam by taking Docker training courses, reading the Docker documentation, and practicing with Docker technology on their own.
NEW QUESTION # 187
Which networking drivers allow you to enable multi-host network connectivity between containers?
Answer: A
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 # 188
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run -v /data:/mydata --mode readonly ubuntu'
Answer: B
Explanation:
= The command docker run -v /data:/mydata --mode readonly ubuntu is not valid because it has some syntax errors. The correct syntax for running a container with a bind mount is docker run [OPTIONS] IMAGE
[COMMAND] [ARG...]. The errors in the command are:
* The option flag for specifying the volume is --volume or -v, not -v. For example, -v
/data:/mydata should be --volume /data:/mydata.
* The option flag for specifying the mode of the volume is --mount, not --mode. For example, --mode readonly should be --mount type=bind,source=/data,target=/mydata,readonly.
* The option flag for specifying the mode of the container is --detach or -d, not --mode. For example, --mode readonly should be --detach.
The correct command for running a container with a bind mount in read-only mode is:
docker run --volume /data:/mydata --mount type=bind,source=/data,target=/mydata,readonly --detach ubuntu This command will run a container using the ubuntu image and mount the host's /data directory to the container's /mydata directory in read-only mode. The container will run in the background (--detach).
References: : docker run reference | Docker Documentation : [Use bind mounts | Docker Documentation]
NEW QUESTION # 189
Is this an advantage of multi-stage builds?
Solution.better logical separation of Dockerfile instructions for increased readability
Answer: A
Explanation:
= Multi-stage builds allow you to use multiple FROM statements in your Dockerfile, each starting a new stage of the build1. This can help you achieve better logical separation of Dockerfile instructions for increased readability, as well as other benefits such as smaller image size, faster build time, and reduced security risks23. By separating your Dockerfile into different stages, you can organize your instructions by their purpose, such as building, testing, or deploying your application. You can also copy only the artifacts you need from one stage to another, leaving behind the unnecessary dependencies or tools1. This can make your Dockerfile easier to read and maintain, as well as improve the performance and security of your final image. Reference:
Multi-stage builds | Docker Docs
What Are Multi-Stage Docker Builds? - How-To Geek
Multi-stage | Docker Docs
NEW QUESTION # 190
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay -o encrypted=true <network-name>
Answer: A
Explanation:
Explanation
This command will ensure that overlay traffic between service tasks is encrypted, because it uses the -o encrypted=true option to enable encryption for the overlay network. According to the official documentation, when you enable overlay encryption, Docker creates IPSEC tunnels between all the nodes where tasks are scheduled for services attached to the overlay network. These tunnels also use the AES algorithm in GCM mode and manager nodes automatically rotate the keys every 12 hours.
References: https://docs.docker.com/network/drivers/overlay/#encryption
https://docs.docker.com/network/network-tutorial-overlay/#use-an-overlay-network-for-standalone-containers
NEW QUESTION # 191
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Manually download the 'docker-ee' package
Answer: B
Explanation:
= Manually downloading the 'docker-ee' package will not upgrade Docker Engine CE to Docker Engine EE. Docker Engine CE and Docker Engine EE are two different products with different installation methods and features. Docker Engine CE is a free and open source containerization platform, while Docker Engine EE is a subscription-based enterprise-grade platform that offers additional features such as security scanning, certified plugins, and support12. To upgrade from Docker Engine CE to Docker Engine EE, you need to uninstall Docker Engine CE and install Docker Engine EE following the official documentation3. Reference:
What is the exact difference between Docker EE (Enterprise Edition), Docker CE (Community Edition) and Docker (Custom Support) - Stack Overflow Difference between Docker Community Edition (CE) vs Docker Enterprise Edition (EE) in 2020 Install Docker Engine | Docker Docs
NEW QUESTION # 192
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