Docker DCA Reliable Exam Pdf - DCA Exam Format

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The DCA exam is a computer-based exam that consists of 55 multiple-choice questions. Candidates have 90 minutes to complete the exam and must score at least 65% to pass. DCA Exam is available in English, Japanese, and Simplified Chinese. Candidates can take the exam at any Pearson VUE testing center around the world.

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Docker DCA certification exam consists of 55 multiple-choice questions, and the candidate has 90 minutes to complete the exam. DCA exam covers various topics, including Docker architecture, image creation, networking, security, and troubleshooting. DCA Exam is conducted online, and the candidate needs to have a stable internet connection and a webcam.

Docker Certified Associate (DCA) Exam Sample Questions (Q77-Q82):

NEW QUESTION # 77
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. Yes
B. No

Answer: B

NEW QUESTION # 78
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: B

Explanation:
Explanation
Creating a PersistentVolume with storageClass: "" and hostPath: /data, and a persistentVolumeClaim requesting this PV, and then using that PVC to populate a volume in a pod is not a strategy that successfully accomplishes this. A PersistentVolume is an API object that represents a piece of storage in the cluster that has been provisioned by an administrator. A PersistentVolumeClaim is a request for storage by a user. A hostPath PersistentVolume uses a file or directory on the node to emulate network-attached storage. However, this type of volume only works on a single node cluster, and it does not work on Windows nodes. Therefore, it cannot be used to mount the /data directory on your laptop into a container. References:
https://kubernetes.io/docs/concepts/storage/persistent-volumes/,
https://kubernetes.io/docs/concepts/storage/volumes/#hostpath

NEW QUESTION # 79
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 pod and add all the resources needed for each application

A. Yes
B. No

Answer: B

Explanation:
Explanation
Creating one pod and adding all the resources needed for each application is not a good way to accomplish the goal of grouping Kubernetes-specific resources for each application. This is because pods are the smallest unit of a Kubernetes application, and they are designed to run a single container or a set of tightly coupled containers that share the same network and storage resources1. Pods are ephemeral and can be created and destroyed by the Kubernetes system at any time. Therefore, putting multiple applications in one pod would make them harder to manage, scale, and update independently. A better way to accomplish the goal is to use namespaces, which are logicalclusters within a physical cluster that can isolate resources, policies, and configurations for different applications2. Namespaces can also help organize secrets, which are Kubernetes objects that store sensitive information such as passwords, tokens, and keys3. References:
* Pods | Kubernetes
* Namespaces | Kubernetes
* Secrets | Kubernetes

NEW QUESTION # 80
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
The set of commands docker container inspect and docker port can identify the published port(s) for a container. The docker container inspect command returns low-level information about a container, including its network settings and port bindings1. The docker port command lists port mappings or a specific mapping for the container2. Both commands can show which host port is mapped to which container port, and the protocol used. For example, docker container inspect -f '{{.NetworkSettings.Ports}}' container_name will show the port bindings for the container_name3. Similarly, docker port container_name will show the port mappings for the container_name. References:
* docker container inspect
* docker port
* How to Expose and Publish Ports in Docker
* [How to obtain the published ports from within a docker container?]

NEW QUESTION # 81
Which docker run` flag lifts cgroup limitations?

A. `docker run -privileged
B. `docker run -cap-drop
C. `docker run -isolation
D. `docker run -cpu-period

Answer: A

Explanation:
Explanation
The --privileged flag lifts all the cgroup limitations for a container, as well as other security restrictions imposed by the Docker daemon1. This gives the container full access to the host's devices, resources, and capabilities, as if it was running directly on the host2. This can be useful for certain use cases that require elevated privileges, such as running Docker-in-Docker or debugging system issues3. However, using the
--privileged flag also poses a security risk, as it exposes the host to potential attacks or damages from the container4. Therefore, it is not recommended to use the --privileged flag unless absolutely necessary, and only with trusted images and containers.
The other options are not correct because they do not lift all the cgroup limitations for a container, but only affect specific aspects of the container's resource allocation or isolation:
*The --cpu-period flag sets the CPU CFS (Completely Fair Scheduler) period for a container, which is the length of a CPU cycle in microseconds. This flag can be used in conjunction with the --cpu-quota flag to limit the CPU time allocated to a container. However, this flag does not affect other cgroup limitations, such as memory, disk, or network.
*The --isolation flag sets the isolation technology for a container, which is the mechanism that separates the container from the host or other containers. This flag is only available on Windows containers, and can be used to choose between process, hyperv, or process-isolated modes. However, this flag does not affect the cgroup limitations for a container, but only the level of isolation from the host or other containers.
*The --cap-drop flag drops one or more Linux capabilities for a container, which are the privileges that a process can use to perform certain actions on the system. This flag can be used to reduce the attack surface of a container by removing unnecessary or dangerous capabilities. However, this flag does not affect the cgroup limitations for a container, but only the capabilities granted to the container by the Docker daemon.
References:
*Runtime privilege and Linux capabilities
*Docker Security: Using Containers Safely in Production
*Docker run reference
*Docker Security: Are Your Containers Tightly Secured to the Ship? SlideShare
*[Secure Engine]
*[Configure a Pod to Use a Limited Amount of CPU]
*[Limit a container's resources]
*[Managing Container Resources]
*[Isolation modes]
*[Windows Container Isolation Modes]
*[Windows Container Version Compatibility]
*[Docker and Linux Containers]
*[Docker Security Cheat Sheet]
*[Docker Security: Using Containers Safely in Production]

NEW QUESTION # 82
......

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Docker DCA Reliable Exam Pdf - DCA Exam Format

Authoritative DCA Reliable Exam Pdf Covers the Entire Syllabus of DCA

Docker Certified Associate (DCA) Exam Sample Questions (Q77-Q82):

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