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NEW QUESTION # 73
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Network
- A. Yes
- B. No
Answer: A
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 # 74
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: Add them to a team in the engineering organization that has read/write access to the engineering/api repository.
- A. Yes
- B. No
Answer: B
NEW QUESTION # 75
Is this a function of UCP?
Solution: scans images to detect any security vulnerability
- A. Yes
- B. No
Answer: B
NEW QUESTION # 76
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 5-1-1
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
This is not how they should be distributed across three datacenters or availability zones, because having one manager in two datacenters or availability zones creates a risk of losing quorum if those datacenters or availability zones become unavailable. According to the official documentation, managers should be distributed evenly across datacenters or availability zones to ensure that the swarm can survive the loss of any one datacenter or availability zone.
References: https://docs.docker.com/engine/swarm/admin_guide/#add-manager-nodes-for-fault-tolerance
NEW QUESTION # 77
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. Yes
- B. No
Answer: A
Explanation:
Explanation
= Provisioning a Docker config object for each environment is a way to provision configuration to containers at runtime. Docker configs allow services to adapt their behaviour without the need to rebuild a Docker image.
Services can only access configs when explicitly granted by a configs attribute within the services top-level element. As with volumes, configs are mounted as files into a service's container's filesystem1. Docker configs are supported on both Linux and Windows services2. References: Docker Documentation, Configs top-level element
NEW QUESTION # 78
Will this command display a list of volumes for a specific container?
Solution: 'docker container inspect nginx'
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
This command will display a list of volumes for a specific container, because it uses docker container inspect to show detailed information about a container, including its volumes. According to the official documentation, docker container inspect will show the Mounts section that contains information about all volumes mounted by the container.
References: https://docs.docker.com/engine/reference/commandline/container_inspect/
https://docs.docker.com/storage/volumes/#start-a-container-with-a-volume
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: Add all the resources to the default namespace.
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
Adding all the resources to the default namespace is not a way to accomplish this, because it would not isolate the resources for each application. Instead, the teams should use namespaces, which are a mechanism to organize resources in a Kubernetes cluster. Namespaces provide a scope for names of resources and a way to attach authorization and policy to a subset of the cluster. By creating a separate namespace for each application, the teams can ensure that their resources are grouped together and not accessible by other teams or applications.
References:
* What is a Container? | Docker
* Docker Certified Associate Guide | KodeKloud
* DCA Prep Guide | GitHub
* Namespaces | Kubernetes
NEW QUESTION # 80
Will a DTR security scan detect this?
Solution.private keys copied to the image
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
= A DTR security scan will detect private keys copied to the image. DTR security scan is a feature of Docker Trusted Registry (DTR) that scans images to detect any security vulnerability1. DTR security scan uses the open source tool SecretScanner2 to find unprotected secrets in container images or file systems. SecretScanner can match the contents of images against a database of approximately 140 secret types, including private keys3. Therefore, if an image contains private keys, DTR security scan will report them as potential secrets and alert the user to remove them from the image. References:
* Scan images for vulnerabilities | Docker Docs
* GitHub - deepfence/SecretScanner: :unlock: Find secrets and passwords ...
* SecretScanner/deepfence_secret_scanner.py at main deepfence/SecretScanner
NEW QUESTION # 81
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker service create --network --secure
- A. Yes
- B. No
Answer: B
NEW QUESTION # 82
Is this an advantage of multi-stage builds?
Solution: simultaneously creates and tags multiple images
- A. Yes
- B. No
Answer: B
NEW QUESTION # 83
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 inspect http'
- A. Yes
- B. No
Answer: B
NEW QUESTION # 84
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: inter-process communication
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
(Please check the official Docker site for the verified answer) Comprehensive Explanation: = (Please check the official Docker site for the comprehensive explanation) References: (Some possible references from the web search results are)
* Docker Security - Docker Documentation
* Docker Security Best Practices - Medium
* Docker Security Cheat Sheet - GitHub
* Docker Security: A Comprehensive Guide - Snyk
* Docker Security: Tips and Tricks to Secure Your Containers - DevSecOps I hope this helps you in your exam preparation. Good luck!
NEW QUESTION # 85
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use either EXPOSE or --publish to access the containers on the bridge network
- A. Yes
- B. No
Answer: A
NEW QUESTION # 86
Will this command display a list of volumes for a specific container?
Solution: 'docker container inspect nginx'
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
= The command docker container inspect nginx will display a list of volumes for the specific container named nginx. The output of the command will include a section called "Mounts" that shows the source, destination, mode, type, and propagation of each volume mounted in the container1. For example, the following output shows that the container nginx has two volumes: one is a bind mount from the host's /var/log/nginx directory to the container's /var/log/nginx directory, and the other is an anonymous volume created by Docker at
/var/lib/docker/volumes/... and mounted to the container's /etc/nginx/conf.d directory2.
"Mounts": [
{
"Type": "bind",
"Source": "/var/log/nginx",
"Destination": "/var/log/nginx",
"Mode": "rw",
"RW": true,
"Propagation": "rprivate"
},
{
"Type": "volume",
"Name": "f6eb3dfdd57b7e632f6329a6d9bce75a1e8ffdf94498e5309c6c81a87832c28d",
"Source":
"/var/lib/docker/volumes/f6eb3dfdd57b7e632f6329a6d9bce75a1e8ffdf94498e5309c6c81a87832c28d/_data",
"Destination": "/etc/nginx/conf.d",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
]
References:
* docker container inspect
* List volumes of Docker container
NEW QUESTION # 87
Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?
Solution: A default provisioner is specified, and subsequently a persistentVolumeClaim is created.
- A. Yes
- B. No
Answer: B
Explanation:
Explanation
= The conditions are not sufficient for Kubernetes to dynamically provision a persistentVolume, because they are missing a StorageClass object. A StorageClass object defines which provisioner should be used and what parameters should be passed to that provisioner when dynamic provisioning is invoked. A persistentVolumeClaim must specify the name of a StorageClass in its storageClassName field to request a dynamically provisioned persistentVolume. Without a StorageClass, Kubernetes cannot determine how to provision the storage for the claim. References:
* Dynamic Volume Provisioning | Kubernetes
* Persistent volumes and dynamic provisioning | Google Kubernetes Engine ...
* Dynamic Provisioning and Storage Classes in Kubernetes or Dynamic Provisioning and Storage Classes in Kubernetes
NEW QUESTION # 88
Which networking drivers allow you to enable multi-host network connectivity between containers?
- A. macvlan, ipvlan, and overlay
- B. host, macvlan, overlay, user-defined
- C. bridge, user-defined, host
- D. bridge, macvlan, ipvlan, overlay
Answer: A
NEW QUESTION # 89
What is one way of directly transferring a Docker Image from one Docker host in another?
- A. There is no way of directly transferring Docker images between hosts. A Docker Registry must be used ad an intermediary.
- B. 'docker push' the image to the IP address of the target host.
- C. 'docker commit' to save the image outside of the Docker filesystem. Then transfer the file over to the target host and 'docker start' to start the container again.
- D. 'docker save' the image to save it as TAR file and copy it over to the target host. Then use 'docker load' to un-TAR the image back as a Docker image.
Answer: D
NEW QUESTION # 90
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The DCA certification exam is ideal for IT professionals, system administrators, DevOps engineers, and developers who want to demonstrate their proficiency in Docker technologies. Docker Certified Associate (DCA) Exam certification is recognized globally and is an essential requirement for many job roles that involve Docker technologies. Docker Certified Associate (DCA) Exam certification is a valuable asset for anyone looking to advance their career in the field of containerization.
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