Docker - DCA - Docker Certified Associate (DCA) Exam–Updated Exam Engine

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To prepare for the DCA exam, you need to have a good understanding of Docker technology and its components. You should be familiar with Docker CLI commands, Dockerfile syntax, Docker networking concepts, and container orchestration tools like Docker Compose and Kubernetes. Docker offers a variety of resources to help you prepare for the DCA Exam, including training courses, practice exams, and study guides.

Docker Certified Associate (DCA) Exam Sample Questions (Q166-Q171):

NEW QUESTION # 166
Will this command mount the host's '/data1directory to the ubuntu container in read-only mode?
Solution. 'docker run -v /data:/mydata -mode readonly ubuntu'

A. Yes
B. No

Answer: B

Explanation:
The command docker run -v /data:/mydata -mode readonly ubuntu will not mount the host's /data1 directory to the ubuntu container in read-only mode. The commandhas several errors that prevent it from working correctly. First, the host directory should be /data1 instead of /data, as specified in the question. Second, the option flag should be --mode instead of -mode, and it should be placed before the image name. Third, the mode value should be ro instead of readonly, as per the Docker documentation1. The correct command should be docker run -v /data1:/mydata --mode ro ubuntu, which will mount the host's /data1 directory as a read-only volume at /mydata inside the container1. Reference:
docker run | Docker Docs

NEW QUESTION # 167
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Delete '/var/lib/docker' directory.

A. Yes
B. No

Answer: B

Explanation:
Explanation
Deleting '/var/lib/docker' directory does not upgrade Docker Engine CE to Docker Engine EE. The
'/var/lib/docker' directory is where Docker stores all its data and metadata related to containers, images, volumes, networks, etc. Deleting this directory will remove all your Docker data and configurations from your system, but it will not change your Docker version or edition. To upgrade Docker Engine CE to Docker Engine EE, you need to uninstall 'docker-ce' package before installing 'docker-ee' package. References:
https://docs.docker.com/engine/install/linux-postinstall/#where-are-images-and-containers-stored-on-the-filesyst
https://docs.docker.com/engine/install/centos/#upgrade-docker-after-using-the-convenience-script

NEW QUESTION # 168
A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space.
If every pod on this node has exactly two containers in it, how many pods can this address space support on this node?

A. 64 for every service routing to pods on this node
B. 32 In every Kubernetes namespace
C. 0
D. 1

Answer: A

NEW QUESTION # 169
The Kubernetes yaml shown below describes a clusterIP service.

Is this a correct statement about how this service routes requests?
Solution: Traffic sent to the IP of this service on port 8080 will be routed to port 80 in a random pod with the label aPP: nginx.

A. No
B. Yes

Answer: B

Explanation:
Explanation
The statement is correct. In the provided Kubernetes YAML, it's defined that traffic sent to the IP of this service on port 8080 will be routed to port 80 in a random pod with the label app: nginx. This is because it's a ClusterIP service type which is meant for internal communication within the cluster, and it uses selectors to route traffic to the correct pods. References: Docker Certified Associate Guide, DCA Prep Guide

NEW QUESTION # 170
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: resource reservation

A. Yes
B. No

Answer: B

NEW QUESTION # 171
......

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