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New Docker DCA Dumps & Questions Updated on 2024
Docker Certified Associate (DCA) Certification Exam is a vendor-neutral certification that is recognized globally. Docker Certified Associate (DCA) Exam certification is designed to help professionals demonstrate their expertise and credibility in using Docker technologies. Docker Certified Associate (DCA) Exam certification exam is an excellent opportunity for professionals to showcase their skills and knowledge to potential employers, clients, and peers.
The DCA certification exam is a valuable credential for IT professionals looking to advance their careers in cloud computing, DevOps, and containerization. Docker Certified Associate (DCA) Exam certification is recognized by leading technology companies and organizations, including Amazon Web Services (AWS), Microsoft, and IBM. Candidates who pass the exam are eligible to join the Docker Certified Associate community, where they can connect with other certified professionals, access training and resources, and receive updates on Docker technology and best practices.
NEW QUESTION # 65
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. Yes
- B. No
Answer: B
Explanation:
Explanation
Mirroring the engineering/api repository to one of the user's own private repositories does not grant them read/write access to the engineering/api repository. Mirroring is a feature that allows you to automatically replicate images from one repository to another, either within the same DTR or across different DTRs.
Mirroring does not change the permissions or access levels of the source or destination repositories. It only copies the images and tags from one repository to another. To grant a user read/write access to the engineering/api repository, you need to add them as a collaborator with read/write role on that repository, or add them to a team that has read/write role on that repository. References:
https://docs.docker.com/ee/dtr/user/manage-images/mirror-repository-images/,
https://docs.docker.com/ee/dtr/user/manage-repositories/set-repository-permissions/
NEW QUESTION # 66
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
NEW QUESTION # 67
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. Yes
- B. No
Answer: B
Explanation:
Explanation
Environment variables cannot be used to schedule containers to meet the security policy requirements.
Environment variables are key-value pairs that can be passed to containers when they are created or run.
Environment variables can be used to configure the behavior of the containerized application or provide runtime information, such as database credentials, API keys, etc. Environment variables do not affect how containers are scheduled on nodes in a swarm mode cluster. References:
https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables-e-env-env-file,
https://docs.docker.com/engine/swarm/services/#create-a-service
NEW QUESTION # 68
Will this sequence of steps completely delete an image from disk in the Docker Trusted Registry?
Solution: Delete the image and run garbage collection on the Docker Trusted Registry.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Deleting the image and running garbage collection on the Docker Trusted Registry will completely delete the image from disk. According to the official documentation, this is the recommended way to remove images and reclaim disk space.
References: https://docs.docker.com/ee/dtr/admin/manage-images/garbage-collection/
NEW QUESTION # 69
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: namespaces
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Namespaces are a Linux kernel feature that isolate containers from each other and from the host system. They limit the access of a container to host resources, such as CPU or memory, by creating a separate namespace for each aspect of a container, such as process IDs, network interfaces, user IDs, etc. This way, a container can only see and use the resources that belong to its own namespace, and not those of other containers or the host12. References:
* Isolate containers with a user namespace | Docker Docs
* Docker overview | Docker Docs
NEW QUESTION # 70
In Docker Trusted Registry, how would a user prevent an image, for example 'nginx:latest' from being
overwritten by another user with push access to the repository?
- A. Tag the image with 'nginx:immutable'
- B. Remove push access from all other users.
- C. Use the DTR web UI to make the tag immutable.
- D. Keep a backup copy of the image on another repository.
Answer: C
NEW QUESTION # 71
You are pulling images from a Docker Trusted Registry installation configured to use self-signed certificates, and this error appears:
'x509: certificate signed by unknown authority'.
You already downloaded the Docker Trusted Registry certificate authority certificate from https://dtr.example.com/ca.
How do you trust it? (Select two.)
- A. Place the certificate in '/etc/docker/certs.d/dtr.example com/ca.crt' on all cluster nodes.
- B. Place the certificate in your OS certificate path, trust the certificate system-wide, and restart the Docker daemon across all cluster nodes.
- C. Place the certificate in '/etc/docker/dtr/dtr.example.com.crt' and restart the Docker daemon on all cluster nodes.
- D. Pass '-trust-certificate ca.crt' to the Docker client.
- E. Pass --insecure-registry to the Docker client.
Answer: A,E
NEW QUESTION # 72
What is the difference between a resource limit and a resource reservation when scheduling services?
- A. A resource limit is hard limit for your service, while a reservation is used to find a host with adequate
resources for scheduling. Correct - B. A resource limit and a resource reservation can be used interchangeably.
- C. A resource limit is a soft limit for your service, while a reservation is hard limit and the docker engine will do its best to keep your service at the limit.
- D. A resource limit is used to find a host with adequate resources for scheduling a hard limit for your service, while a reservation is hard limit for your service.
Answer: B
NEW QUESTION # 73
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages
- A. Yes
- B. No
Answer: A
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 # 74
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Storage
- A. Yes
- B. No
Answer: B
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 # 75
Following the principle of least privilege, which of the following methods can be used to securely grnt access to the specific user to communicate to a Docker engine? (Choose two.)
- A. Utilize openssl to create TLS client and server certificates, configuring the Docker engine to use with mutual TLS over TCP.
- B. Give the user root access to the server to allow them to run Docker commands as root.
- C. Add the user to the 'docker' group on the server or specify the groue with the '--group' Docker daemon option.
- D. Utilize the '--host 127.0.0.1:2375' option to the Docker daemon to listen on port 2375 over TCP on localhost
- E. Utilize the '--host 0.0.0.0:2375' option to the Docker daemon to listen on port 2375 over TCP on all interfaces
Answer: A,C
NEW QUESTION # 76
What behavior is expected when a service is created with the following command:
'docker service create --publish 8000:80 nginx'
- A. All nodes in the cluster will listen on port 80 and forward to port 8080 in the container.
- B. Only a single node in the cluster will listen on port 80 and forward to port 8080 in the container.
- C. All nodes in the cluster will listen on port 8080 and forward to port 80 in the container.
- D. Only a single node in the cluster will listen on port 8080 and forward to port 80 in the container.
Answer: C
NEW QUESTION # 77
Is this an advantage of multi-stage builds?
Solution. better logical separation of Dockerfile instructions for increased readability
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
Better logical separation of Dockerfile instructions for increased readability is not an advantage of multi-stage builds. Multi-stage builds are a feature that allows you to use multiple FROM statements in your Dockerfile.
Each FROM statement begins a new stage of the build. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image. The main advantage of multi-stage builds is that they allow you to reduce the size of your final image by only including the essential components and dependencies. Another advantage of multi-stage builds is that they allow you to optimize the build cache by grouping similar instructions in each stage. Better logical separation of Dockerfile instructions for increased readability is not an inherent advantage of multi-stage builds, as it depends on how you write and organize your Dockerfile. References: https://docs.docker.com/develop/develop-images/multistage-build/,
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#use-multi-stage-builds
NEW QUESTION # 78
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution.capabilities
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Capabilities are a Linux kernel feature that allows processes to perform some privileged operations without having the full power of the root user1. Docker uses capabilities to limit the access of containers to host resources, such as CPU or memory2. By default, Docker drops all capabilities except those needed for the container to function properly, using a whitelist approach3. This reduces the risk of a container compromising the host system or other containers. You can also add or remove capabilities to or from a container at runtime, using the --cap-add or --cap-drop options of the docker run command4. This gives you more control over the security and functionality of your containers. References:
* Capabilities | dockerlabs
* Docker run reference | Docker Docs
* Docker Capabilities and no-new-privileges
* Runtime privilege and Linux capabilities | Docker Docs
NEW QUESTION # 79
Will this command display a list of volumes for a specific container?
Solution: docker volume logs nginx --containers'
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
This command will not display a list of volumes for a specific container, because it has several syntax errors and invalid options. According to the official documentation, there is no such command as docker volume logs or such option as --containers.
References: https://docs.docker.com/engine/reference/commandline/volume/
NEW QUESTION # 80
Which of the following commands will ensure that overlay traffic between service tasks is encrypted?
- A. docker network create -d overlay --secure <network-name>
- B. docker service create --network <network-name> --encrypted <service-name>
- C. docker service create --network <network-name> --secure <service-name>
- D. docker network create -d overlay -o encrypted=true <network-name>
Answer: D
NEW QUESTION # 81
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
= The strategy of creating a PersistentVolume with hostPath and a PersistentVolumeClaim to mount the /data directory on your laptop into a container will not work, because hostPath volumes are only suitable for single node testing or development. They are not portable across nodes and do not support dynamic provisioning. If you want to mount a local directory from your laptop into a Kubernetes pod, you need to use a different type of volume, such as NFS, hostPath CSI, or minikube. Alternatively, you can copy the files from your laptop to the container using kubectl cp command. References:
* Volumes | Kubernetes
* Configure a Pod to Use a PersistentVolume for Storage | Kubernetes
* Mount a local directory to kubernetes pod - Stack Overflow
* Kubernetes share a directory from your local system to kubernetes container - Stack Overflow
* How to Mount a Host Directory Into a Docker Container
NEW QUESTION # 82
You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Mount the configuration file directly into the appropriate pod and container using the
.spec.containers.configMounts key.
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
The solution given is not a valid way to provide a configuration file to a container at runtime using Kubernetes tools and steps. The reason is that there is no such key as .spec.containers.configMounts in the PodSpec. The correct key to use is .spec.containers.volumeMounts, which specifies the volumes to mount into the container's filesystem1. To use a ConfigMap as a volume source, one needs to create a ConfigMap object that contains the configuration file as a key-value pair, and then reference it in the .spec.volumes section of the PodSpec2. A ConfigMap is a Kubernetes API object that lets you store configuration data for other objects to use3. For example, to provide a nginx.conf file to a nginx container, one can do the following steps:
* Create a ConfigMap from the nginx.conf file:
kubectl create configmap nginx-config --from-file=nginx.conf
* Create a Pod that mounts the ConfigMap as a volume and uses it as the configuration file for the nginx container:
apiVersion: v1
kind: Pod
metadata:
name: nginx-pod
spec:
containers:
- name: nginx
image: nginx
volumeMounts:
- name: config-volume
mountPath: /etc/nginx/nginx.conf
subPath: nginx.conf
volumes:
- name: config-volume
configMap:
name: nginx-config
References:
* Configure a Pod to Use a Volume for Storage | Kubernetes
* Configure a Pod to Use a ConfigMap | Kubernetes
* ConfigMaps | Kubernetes
NEW QUESTION # 83
The Kubernetes yaml shown below describes a networkPolicy.
Will the networkPolicy BLOCK this traffic?
Solution: a request issued from a pod lacking the tier: api label, to a pod bearing the tier: backend label
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
The networkPolicy will not block this traffic because it does not apply to pods that have the tier: backend label. The networkPolicy only applies to pods that have the tier: frontend label, as specified by the podSelector field. Pods that have the tier: backend label are not affected by this networkPolicy and can receive traffic from any source.
References:
https://kubernetes.io/docs/concepts/services-networking/network-policies/#the-networkpolicy-resource
NEW QUESTION # 84
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