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Docker Certified Associate (DCA) Certification Exam is a professional certification that validates a candidate’s knowledge and proficiency in using Docker Enterprise Edition (EE) and Docker Community Edition (CE) in a real-world environment. DCA exam is designed to test the candidate’s ability to perform tasks related to Docker, such as deploying and managing Docker containers, working with images, networking, and security.
The DCA exam is a comprehensive test that covers a wide range of topics related to Docker containers. It includes questions on Docker installation and configuration, container management, Docker networking, security, and troubleshooting. DCA exam consists of 55 multiple-choice questions, and you have 90 minutes to complete it. The passing score for the DCA exam is 65%.
NEW QUESTION # 94
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 # 95
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: Linux capabilities
- A. No
- B. Yes
Answer: B
Explanation:
Explanation
Linux capabilities are blocking this operation. Linux capabilities are a partitioning of the privileges traditionally associated with superuser into distinct units, known as capabilities, which can be independently enabled and disabled. Capabilities are used by Docker to restrict the operations that a container can perform on the host system. By default, Docker drops all capabilities except those needed for common operations, such as binding to ports below 1024 or mounting filesystems. One of the capabilities that is dropped by default is CAP_SYS_TIME, which allows setting the system clock. Therefore, a user cannot set the system time from inside a Docker container unless this capability is explicitly added. References:
https://docs.docker.com/engine/security/security/#linux-kernel-capabilities,
https://man7.org/linux/man-pages/man7/capabilities.7.html
NEW QUESTION # 96
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.environment variables
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Environment variables cannot be used to schedule containers to meet the security policy requirements. Environment variables are used to pass configuration data to the containers, not to control where they run1. To schedule containers to run on separate nodes in a Swarm cluster, you need to use node labels and service constraints23. Node labels are key-value pairs that you can assign to nodes to organize them into groups4. Service constraints are expressions that you can use to limit the nodes where a service can run based on the node labels. For example, you can label some nodes as env=dev and others as env=prod, and then use the constraint --constraint node.labels.env==dev or --constraint node.labels.env==prod when creating a service to ensure that it runs only on the nodes with the matching label. References:
* 1: Environment variables in Compose | Docker Docs
* 2: Deploy services to a swarm | Docker Docs
* 3: How to use Docker Swarm labels to deploy containers on specific nodes
* 4: Manage nodes in a swarm | Docker Docs
* [5]: Swarm mode routing mesh | Docker Docs
* [6]: Docker Swarm - How to set environment variables for tasks on various nodes
NEW QUESTION # 97
Will this command list all nodes in a swarm cluster from the command line?
Solution. 'docker inspect nodes
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
This command does not list all nodes in a swarm cluster from the command line. The docker inspect command shows low-level information about one or more objects, such as containers, images, networks, etc. It does not show information about nodes or services. To list all nodes in a swarm cluster from the command line, you need to use docker node ls command. This command shows information about all the nodes that are part of the swarm, such as their ID, hostname, status, availability, etc. References:
https://docs.docker.com/engine/reference/commandline/inspect/,
https://docs.docker.com/engine/reference/commandline/node_ls/
NEW QUESTION # 98
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Storage
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Storage is not a type of Linux kernel namespace that provides container isolation. Namespaces are a Linux kernel feature that provide isolation and virtualization of system resources for processes. They can be used to create isolated environments for containers that have their own view of system resources, such as process IDs, user IDs, network interfaces, etc. However, there is no storage namespace in Linux. The types of namespaces that exist are mount (mnt), process ID (pid), network (net), interprocess communication (ipc), user ID (user), control group (cgroup), time (time), and user namespace (uts). References:
https://docs.docker.com/engine/security/userns-remap/,
https://man7.org/linux/man-pages/man7/namespaces.7.html
NEW QUESTION # 99
Two development teams in your organization use Kubernetes and want to deploy their applications while ensuring that Kubernetes-specific resources, such as secrets, are grouped together for each application.
Is this a way to accomplish this?
Solution: Create one namespace for each application and add all the resources to it.
- A. No
- B. Yes
Answer: A
NEW QUESTION # 100
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Network
- A. No
- B. Yes
Answer: B
Explanation:
Explanation
Network is a type of Linux kernel namespace that provides container isolation. Network namespaces isolate the system resources associated with networking, such as network interfaces, IP addresses, routing tables, firewall rules, etc. Each network namespace has its own virtual network stack, and processes in different network namespaces can communicate through virtual network devices or tunnels1. Network namespaces are used byDocker to create isolated networks for containers, and allow users to customize the network configuration and connectivity of each container2. References:
* network_namespaces(7) - Linux manual page
* Docker network overview | Docker Documentation
NEW QUESTION # 101
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: A
Explanation:
Explanation
Using 'docker service inspect http' does not enable you to view the list of historical tasks for this service. The docker service inspect command shows low-level information about one or more services, such as their configuration, replicas, networks, endpoints, etc. It does not show the history of tasks that have been run by the service. To view the list of historical tasks for this service, you need to use 'docker service ps http'.
References: https://docs.docker.com/engine/reference/commandline/service_inspect/,
https://docs.docker.com/engine/reference/commandline/service_ps/
NEW QUESTION # 102
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. No
- B. Yes
Answer: A
NEW QUESTION # 103
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution:docker network create -d overlay --secure
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= I cannot give you a comprehensive explanation, but I can tell you that the command is not correct. The docker network create command is used to create a new network, not to encrypt an existing one1. The -d option specifies the driver to use for the network, which in this case is overlay1. The overlay driver enables multi-host networking for swarm services2. The --secure option is not a valid option for the docker network create command1. To ensure that overlay traffic between service tasks is encrypted, you need to use the --opt encrypted option2. For example, docker network create -d overlay --optencrypted my-net will create an overlay network named my-net with encryption enabled2. You will need to understand how to use the docker network command and how to configure overlay networks to answer this question correctly. References:
* Docker network create command documentation: 1
* Overlay network encryption documentation: 2
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 3, 4, 5, 6, and [7]. Good luck!
NEW QUESTION # 104
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. No
- B. Yes
Answer: A
Explanation:
Explanation
Resource reservation cannot be used to schedule containers to meet the security policy requirements, because resource reservation only affects the available resources on a node and does not restrict which containers can run on which nodes. According to the official documentation, resource reservation is used to ensure that a service has enough resources to run.
References: https://docs.docker.com/engine/swarm/services/#reserve-memory-or-cpus-for-a-service
NEW QUESTION # 105
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object.
Does this command display it?
Solution: kubectl describe deployment api
- A. No
- B. Yes
Answer: B
Explanation:
Explanation
= The command kubectl describe deployment api displays the events table for the deployment object called api, along with other information such as labels, replicas, strategy, conditions, and pod template. The events table shows the history of actions that have affected the deployment, such as scaling, updating, or creating pods. This can help troubleshoot any issues with the deployment. To see only the events table, you can use the flag --show-events=true with the command. References:
* Deployments | Kubernetes
* kubectl - How to describe kubernetes resource - Stack Overflow
* Kubectl: Get Deployments - Kubernetes - ShellHacks
* kubernetes - Kubectl get deployment yaml file - Stack Overflow
NEW QUESTION # 106
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution:Use network attach to access the containers on the bridge network
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= (Please check the official Docker site for the comprehensive explanation) References: (Some possible references from the web search results are)
* 25 Free Questions on Docker Certified Associate Exam - Whizlabs
* Practice Questions for Docker Certified Associate (DCA) Exam - Medium
* Practice Exams (3 Sets) - Docker Certified Associate (DCA) - Udemy
* Docker Certified Associate Practice Exam | +600 exam quizz - Udemy
* Docker Certified Associate DCA Practice Exam | UPDATED 2023 - Udemy
I hope this helps you in your exam preparation. Good luck!
NEW QUESTION # 107
In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository?
Solution: Use the DTR web Ul to make all tags in the repository immutable.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
n: = Using the DTR web UI to make all tags in the repository immutable is not a good way to prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository. This is because making all tags immutable would prevent any updates to the images in the repository, which may not be desirable for some use cases. For example, if a user wants to push a new version of 'nginx:latest' with a security patch, they would not be able to do so if the tag is immutable. A better way to prevent an image from being overwritten by another user is to use the DTR webUI to create a promotion policy that restricts who can push to a specific tag or repository1. Alternatively, the user can also use the DTR API to create a webhook that triggers a custom action when an image is pushed to a repository2. References:
* Prevent tags from being overwritten | Docker Docs
* Create webhooks | Docker Docs
NEW QUESTION # 108
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 # 109
You add a new user to the engineering organization in DTR.
Will this action grant them read/write access to the engineering/api repository?
Solution. Mirror the engineering/api repository to one of the user's own private repositories.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= Mirroring the engineering/api repository to one of the user's own private repositories will not grant them read/write access to the original repository. Mirroring is a feature that allows users to automatically sync images from one repository to another, either within the same DTR or across different DTRs. Mirroring does not affect the permissions or roles of the users or teams associated with the source or destination repositories.
To grant a user read/write access to the engineering/api repository, the user needs to be added to a team that has the appropriate role for that repository, or the repository needs to be configured with the appropriate visibility and access settings. References:
* Mirror repositories
* Manage access to repositories
* Manage teams
NEW QUESTION # 110
When using the Docker client to push an image to a registry, what environment variable is used to instruct the client to perform signing of the image?
- A. DOCKER_PUSH_SIGN=1
- B. DOCKER_CONTENT_TRUST=1
- C. DOCKER_IMAGE_SIGN=1
- D. NOTARY_ENABLE=1
Correct
Answer: B
NEW QUESTION # 111
Will this command mount the host's '/data1directory to the ubuntu container in read-only mode?
Solution. 'docker run -v /data:/mydata -mode readonly ubuntu'
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
The command docker run -v /data:/mydata -mode readonly ubuntu will not mount the host's /data1 directory to the ubuntu container in read-only mode. The command has several errors that prevent it from working correctly. First, the host directory should be /data1 instead of /data, as specified in the question. Second, the option flag should be --mode instead of -mode, and it should be placed before the image name. Third, the mode value should be ro instead of readonly, as per the Docker documentation1. The correct command should be docker run -v /data1:/mydata --mode ro ubuntu, which will mount the host's /data1 directory as a read-only volume at /mydata inside the container1. References:
* docker run | Docker Docs
NEW QUESTION # 112
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use --link to access the container on the bridge network.
- A. No
- B. Yes
Answer: A
NEW QUESTION # 113
In the context of a swarm mode cluster, does this describe a node?
Solution.an instance of the Docker CLI connected to the swarm
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
The statement does not describe a node in the context of a swarm mode cluster. A node is a physical or virtual machine running Docker Engine 1.12 or later in swarm mode1. An instance of the Docker CLI connected to the swarm is not a node, but a client that can interact with the swarm through the Docker API2. The Docker CLI can be used to create a swarm, join nodes to a swarm, deploy services to a swarm, and manage swarm behavior3. References: How nodes work), Docker CLI), Swarm mode overview)
NEW QUESTION # 114
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use --link to access the container on the bridge network.
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
= The action of using --link to access the container on the bridge network does not accomplish the goal of creating a container that is reachable from its host's network. The --link option allows you to connect containers that are running on the same network, but it does not expose the container's ports to the host1. To create a container that is reachable from its host's network, you need to use the --network host option, which attaches the container to the host's network stack and makes it share the host's IP address2. Alternatively, you can use the --publish or -p option to map the container's ports to the host's ports3.
References: : Legacy container links | Docker Documentation : Networking using the host network | Docker Documentation : docker run reference | Docker Documentation
NEW QUESTION # 115
Is this the purpose of Docker Content Trust?
Solution: Verify and encrypt Docker registry TLS.
- A. No
- B. Yes
Answer: B
NEW QUESTION # 116
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