Docker DCA Online Practice Questions and Exam Preparation

Docker DCA Online Questions & Answers

• Question 51:

  Will this command mount the host's '/data' directory to the ubuntu container in read-only mode? Solution: 'docker run --volume /data:/mydata:ro ubuntu'

  A. Yes
  B. No
  A. Yes

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  Explanation/Reference:

  This command will mount the host's `/data' directory to the ubuntu container in read-only mode, because it uses the correct syntax and options for mounting a host directory as a data volume and making it read-only. According to the official documentation, this is an example of using a read-only volume.

• Question 52:

  What is the docker command to setup a swarm?

  A. docker swarm init
  B. docker swarm create
  C. docker init swarm
  D. docker create swarm
  A. docker swarm init

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  Explanation/Reference:

  https://docs.docker.com/engine/reference/commandline/swarm/

• Question 53:

  Is this a supported user authentication method for Universal Control Plane? Solution: PAM

  A. Yes
  B. No
  B. No

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  Explanation/Reference:

  PAM is not a supported user authentication method for Universal Control Plane. According to the official documentation, the supported methods are LDAP, Active Directory, SAML 2.0, and local users.

• Question 54:

  How do you change the default logging driver for the docker daemon in Linux?

  A. Set the value of log-driver to the name of the logging driver In the daemon.json In /etc/doc
  B. Use the -log-driver' flag when you run a container.
  C. At the command line, type: docker log driver set
  D. Install a logging agent on the Linux host.
  D. Install a logging agent on the Linux host.

• Question 55:

  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 8080 and forward to port 80 in the container.
  B. Only a single node in the cluster will listen on port 8080 and forward to port 80 in the container.
  C. All nodes in the cluster will listen on port 80 and forward to port 8080 in the container.
  D. Only a single node in the cluster will listen on port 80 and forward to port 8080 in the container.
  A. All nodes in the cluster will listen on port 8080 and forward to port 80 in the container.

• Question 56:

  Which set of commands can identify the publishd port(s) for a container? (Choose 1.)

  A. 'docker port inspect', 'docker container inspect'
  B. 'docker container inspect', docker port'
  C. 'docker info','docker network inspect'
  D. 'docker network inspect','docker port'
  B. 'docker container inspect', docker port'

• Question 57:

  Seven managers are in a swarm cluster.

  Is this how should they be distributed across three datacenters or availability zones?

  Solution: 3-3-1 A. Yes

  B. No
  B. No

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  Explanation/Reference:

  This is not how they should be distributed across three datacenters or availability zones, because having one manager in one datacenter or availability zone creates a single point of failure and reduces the fault tolerance of the swarm. 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.

• Question 58:

  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 a collection for for each application.

  A. Yes
  B. No
  A. Yes
  B. No

• Question 59:

  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
  B. No

• Question 60:

  If installing Docker using devicemapper for storage with the Intent to run production workloads, how should devicemapper be configured

  A. direct-lvm
  B. loop-lvm
  C. overlay-lvm
  D. aufs-lvm
  A. direct-lvm