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Docker DCA Exam Syllabus Topics:

Section	Objectives
Troubleshooting	- Diagnostics and debugging 1. Resource monitoring 2. Container logs and events
Security	- Docker security fundamentals 1. User namespaces and permissions 2. Image security scanning 3. Secrets management
Image Creation, Management, and Registry	- Docker images lifecycle 1. Docker Hub and private registries 2. Tagging and pushing images 3. Build images using Dockerfile
Docker Installation & Configuration	- Docker Engine setup and configuration 1. Install Docker on Linux/Windows 2. Configure Docker daemon
Networking	- Docker networking concepts 1. Bridge networks 2. Overlay networks 3. Network troubleshooting
Orchestration	- Container orchestration basics 1. Scaling containers 2. Docker Swarm architecture 3. Services and stacks
Storage and Volumes	- Data persistence in Docker 1. Volumes and bind mounts 2. Storage drivers

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Docker Certified Associate (DCA) Exam Sample Questions (Q139-Q144):

NEW QUESTION # 139
Which of the following commands will create a swarm service which only listens on port 53 using the UDP protocol?

A. docker service create --name dns-cache -p 53:53 --service udp dns-cache
B. docker service create --name dns-cache -p 53:53 --udp dns-cache
C. docker service create --name dns-cache -p 53:53/udp dns-cache
D. docker service create --name dns-cache -p 53:53 ..constraint
networking.protocol.udp=true dns-cache

Answer: C

NEW QUESTION # 140
What is used by the kernel to Isolate resources when running Docker containers?

A. Volumes
B. Overlay networks
C. Namespaces
D. Control groups (also know as cgroups)

Answer: D

NEW QUESTION # 141
What is the difference between a resource limit and a resource reservation when scheduling services?

A. A resource limit is used to find a host with adequate resources for scheduling a hard limit for your service, while a reservation is hard limit for your service.
B. A resource limit and a resource reservation can be used interchangeably.
C. A resource limit is hard limit for your service, while a reservation is used to find a host with adequate
resources for scheduling. Correct
D. A resource limit is a soft limit for your service, while a reservation is hard limit and the docker engine will do its best to keep your service at the limit.

Answer: B

NEW QUESTION # 142
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. No
B. Yes

Answer: A

Explanation:
Explanation
Resource reservation is a feature that allows you to specify the amount of CPU and memory resources that a service or a container needs. This helps the scheduler to place the service or the container on a node that has enough available resources. However, resource reservation does not control which node the service or the container runs on, nor does it enforce any separation or isolation between different services or containers.
Therefore, resource reservation cannot be used to schedule containers to meet the security policy requirements.
References:
* [Reserve compute resources for containers]
* [Docker Certified Associate (DCA) Study Guide]
https://docs.docker.com/config/containers/resource_constraints/
https://success.docker.com/certification/study-guides/dca-study-guide

NEW QUESTION # 143
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution.docker network create -d overlay --secure <network-name>

A. No
B. Yes

Answer: A

Explanation:
Explanation
= The command docker network create -d overlay --secure <network-name> will not ensure that overlay traffic between service tasks is encrypted. The --secure option is not a valid flag for the docker network create command1. To enable encryption for an overlay network, you need to use the --opt encrypted flag instead23. This will create IPSEC tunnels between the nodes where the service tasks are scheduled, using the AES algorithm in GCM mode2. You can verify if an overlay network is encrypted by checking if the IPSEC tunnels were created using tools like netstat4. References:
* 1: docker network create | Docker Docs
* 2: Encrypt traffic on an overlay network | Docker Docs
* 3: Overlay network driver | Docker Docs
* 4: Docker: How to verify if an overlay network is encrypted - Stack Overflow

NEW QUESTION # 144
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