Latest Docker DCA First Attempt, Exam real Dumps Updated [Sep-2023]
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NEW QUESTION # 77
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: A
NEW QUESTION # 78
You have created a Docker bridge network on a host with three containers attached, how do you make this containers accessible outside of the host?
- A. Use network attach to access the containers on the bridge network
- B. Use either EXPOSE or --publish to access the containers on the bridge network
- C. Use network connect to access the containers on the bridge network
- D. Use --link to access the containers on the bridge network
Correct
Answer: B
NEW QUESTION # 79
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: label contraints
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Label constraints can be used to schedule containers to meet the security policy requirements, because label constraints allow you to specify which nodes a service can run on based on node labels. According to the official documentation, label constraints are used to filter nodes based on their role, availability, or any other criteria.
References: https://docs.docker.com/engine/swarm/services/#specify-service-constraints
NEW QUESTION # 80
Is this a supported user authentication method for Universal Control Plane?
Solution. x.500
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
x.500 is not a supported user authentication method for Universal Control Plane (UCP). x.500 is a series of standards for directory services that define how distributed directory information can be accessed and managed over a network. x.500 is not an external authentication backend that UCP supports. UCP supports LDAP, Active Directory, and SAML as external authentication backends. References:
https://docs.docker.com/ee/ucp/admin/configure/external-auth/, https://en.wikipedia.org/wiki/X.500
NEW QUESTION # 81
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Manually download the 'docker-ee' package
- A. Yes
- B. No
Answer: A
NEW QUESTION # 82
In the context of a swarm mode cluster, does this describe a node?
Solution: a physical machine participating in the swarm
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
A physical machine participating in the swarm is a node in the context of a swarm mode cluster. A node is an instance of the Docker engine participating in the swarm. A node can be either a physical machine or a virtual machine. Nodes are either managers or workers. Managers maintain cluster state and manage cluster tasks.
Workers execute tasks assigned by managers. References:
https://docs.docker.com/engine/swarm/key-concepts/#nodes-and-services,
https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/
NEW QUESTION # 83
Which of these swarm manager configurations will cause the cluster to be in a lost quorum state?
- A. 5 managers of which 3 are healthy
- B. 1 manager of which 1 is healthy
- C. 4 managers of which 2 are healthy
- D. 3 managers of which 2 are healthy
Answer: C
NEW QUESTION # 84
The following Docker Compose file is deployed as a stack:
Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.
- A. No
- B. Yes
Answer: A
NEW QUESTION # 85
Which set of commands can identify the publishd port(s) for a container? (Choose 1.)
- A. 'docker container inspect', docker port'
- B. 'docker network inspect','docker port'
- C. 'docker port inspect', 'docker container inspect'
- D. 'docker info','docker network inspect'
Answer: A
NEW QUESTION # 86
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Authentication
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
Authentication 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 authentication 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 # 87
One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: The unhealthy container is restarted.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
The unhealthy container is restarted by the orchestrator to fix the unhealthy container, because this is the default behavior of Kubernetes when a container fails its livenessProbe. According to the official documentation, Kubernetes will kill and restart the container if it does not become healthy after a certain number of failures.
References:
https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-startup-probes/#define-a-li
NEW QUESTION # 88
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: Add a volume to the pod that sets hostPath.path: /data, and then mount this volume into the pod's containers as desired.
- A. Yes
- B. No
Answer: A
Explanation:
Explanation
Adding a volume to the pod that sets hostPath.path: /data, and then mounting this volume into the pod's containers as desired is a strategy that successfully accomplishes this. A hostPath volume mounts a file or directory from the host node's filesystem into a pod. It can be used to access files on the host from a container, such as configuration files, logs, binaries, etc. However, this type of volume is not portable across nodes and should be used with caution. References: https://kubernetes.io/docs/concepts/storage/volumes/#hostpath,
https://kubernetes.io/docs/tasks/configure-pod-container/configure-volume-storage/
NEW QUESTION # 89
In the context of a swarm mode cluster, does this describe a node?
Solution: an instance of the Docker engine participating in the swarm
- A. Yes
- B. No
Answer: A
NEW QUESTION # 90
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 # 91
Which of the following is required to install Docker EE from a package repository?
- A. License key obtained from Docker Store
- B. Repository URL obtained from Docker Hub
- C. License key obtained from Docker Hub
- D. Repository URL obtained from Docker Store
Answer: D
NEW QUESTION # 92
Is this the purpose of Docker Content Trust?
Solution: Enable mutual TLS between the Docker client and server.
- A. No
- B. Yes
Answer: A
NEW QUESTION # 93
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. No
- B. Yes
Answer: A
Explanation:
Explanation
This is not a way to accomplish this, because adding all the resources to the default namespace is not a good practice for isolating applications in Kubernetes. According to the official documentation, namespaces are used to group resources into logical units that correspond to different projects, teams, or environments. Using namespaces can help avoid naming collisions and enforce resource quotas and access policies.
References: https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/
NEW QUESTION # 94
Your organization has a centralized logging solution, such as Sptunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution. docker system events- -filter splunk
- A. No
- B. Yes
Answer: A
Explanation:
Explanation
This does not configure a Docker container to export container logs to the logging solution. The docker system events command shows information about real-time events in the Docker daemon. The --filter flag allows you to filter the output by various criteria, such as type, action, image, container, etc. However, splunk is not a valid filter value and will cause an error. To configure a Docker container to export container logs to the logging solution, you need to use the --log-driver and --log-opt flags when creating or running the container.
These flags allow you to specify which logging driver and options to use for the container. For example, to use Splunk as the logging driver, you can use --log-driver splunk and provide the Splunk URL, token, and other options using --log-opt. References: https://docs.docker.com/engine/reference/commandline/system_events/,
https://docs.docker.com/config/containers/logging/configure/,
https://docs.docker.com/config/containers/logging/splunk/
NEW QUESTION # 95
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Network
- A. No
- B. Yes
Answer: A
NEW QUESTION # 96
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods -I env=development'
- A. Yes
- B. No
Answer: A
NEW QUESTION # 97
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. Yes
- B. No
Answer: A
NEW QUESTION # 98
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