Free Docker DCA Practice Exam with Questions & Answers | Set: 6

 x.500 is not a supported user authentication method for Universal Control Plane (UCP). UCP supports two types of user authentication methods: built-in and external1. Built-in authentication uses the UCP’s own database to store and verify user credentials. External authentication uses an external LDAP or Active Directory service to manage user accounts and passwords1. x.500 is a standard for directory services, which can be used by LDAP or Active Directory, but it is not a user authentication method by itself2. References:

User authentication | Docker Docs

X.500 - Wikipedia

 = The command ‘docker service ps http’ will list the tasks that are running as part of the ‘http’ service, as well as the task history1. The task history shows the previous states of the tasks, such as running, shutdown, rejected, etc. This can help you troubleshoot why the service is not registering as healthy, by looking at the current state, error, and ports of each task1. References:

docker service ps | Docker Docs

Docker Certified Associate Guide

DCA Prep Guide

The statement is incorrect because it does not mention the service name or the clusterIP address. Traffic sent to the IP of any pod with the label app: nginx on port 8080 will not be forwarded to port 80 in that pod, unless the traffic is coming from another pod within the same cluster that knows the pod IP. To access the service from outside the cluster, the traffic must be sent to the clusterIP address of the service, which is assigned by Kubernetes, and the port 8080 of the service, which is defined in the yaml file. The service will then forward the traffic to one of the selected pods on port 80.

To summarize, the correct statement should be:

Traffic sent to the clusterIP address of the service dca on port 8080 will be forwarded to port 80 in one of the pods with the label app: nginx.

= The purpose of Docker Content Trust is to sign and verify image tags using digital signatures for data sent to and received from remote Docker registries12. This allows client-side or runtime verification of the integrity and publisher of specific image tags, ensuring the provenance and security of container images34. References:

1: Content trust in Docker | Docker Docs

2: Docker Content Trust: What It Is and How It Secures Container Images

3: Docker Content Trust in Azure Pipelines - Azure Pipelines

4: 4.5 Ensure Content trust for Docker is Enabled | Tenable®

A Dockerfile is a text file that contains all the commands a user could run on the command line to create an image1. A Dockerfile is composed of instructions that specify the parent image, the packages to install, the files to copy, the ports to expose, and the commands to run2. A Dockerfile can be used to build a Docker image with the docker build command3. References:

Dockerfile reference | Docker Docs

What is a Dockerfile? A Step-by-Step Guide [2023 Updated] - Simplilearn

How to Build Docker Images with Dockerfile | Linuxize

= The command docker volume inspect nginx will not display a list of volumes for a specific container. This is because docker volume inspect expects one or more volume names as arguments, nota container name1. To display a list of volumes for a specific container, you can use the docker inspect command with the --format option and a template that extracts the volume information fromthe container JSON output2. For example, to display the source and destination of the volumes mounted by the container nginx, you can use the following command:

docker inspect --format=' { {range .Mounts}} { {.Source}}: { {.Destination}} { {end}}' nginx

docker volume inspect | Docker Docs

docker inspect | Docker Docs