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Docker DCA study guide

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Docker DCA, also known as Docker Certified Associate, is a certification program offered by Docker that validates a professional's knowledge and skills in containerization using Docker. Docker Certified Associate (DCA) Exam certification exam is designed to test the candidate's understanding of Docker's core concepts, architecture, and its tools and technologies.

Docker Certified Associate (DCA) Exam Sample Questions (Q116-Q121):

NEW QUESTION # 116
You want to create a container that is reachable from its host's network.
Does this action accomplish this?
Solution. Use either EXPOSE or -publish to access the container on the bridge network.

A. No
B. Yes

Answer: A

Explanation:
Explanation
Using either EXPOSE or --publish to access the container on the bridge network does not create a container that is reachable from its host's network. EXPOSE and --publish are options that specify which ports on the container should be exposed or published to the outside world. They do not affect which network the container is connected to. By default, Docker creates and connects containers to a bridge network, which is an internal network that isolates containers from each other and from the host. To create a container that is reachable from its host's network, you need to use --network host option, which connects the container to the host's network stack. References: https://docs.docker.com/engine/reference/builder/#expose,
https://docs.docker.com/engine/reference/run/#expose-incoming-ports,
https://docs.docker.com/network/bridge/, https://docs.docker.com/network/host/

NEW QUESTION # 117
Is this a function of UCP?
Solution: image role-based access control

A. No
B. Yes

Answer: A

Explanation:
Image role-based access control is not a function of UCP. UCP has its own built-in authentication mechanism and integrates with LDAP services. It also has role-based access control (RBAC), so that you can control who can access and make changes to your cluster and applications1. However, image role-based access control is a feature of Docker Trusted Registry (DTR), which integrates with UCP and allows you to manage the images you use for your applications2. DTR lets you define granular permissions for images, such as who can push, pull, delete, or scan them3. Reference: Universal Control Plane overview), Docker Trusted Registry overview), Docker Access Control)

NEW QUESTION # 118
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. No
B. Yes

Answer: A

Explanation:
Explanation
The networkPolicy will not block this traffic because it does not apply to pods that have the tier: backend label. The networkPolicy only applies to pods that have the tier: frontend label, as specified by the podSelector field. Pods that have the tier: backend label are not affected by this networkPolicy and can receive traffic from any source.
References:
https://kubernetes.io/docs/concepts/services-networking/network-policies/#the-networkpolicy-resource

NEW QUESTION # 119
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 80 will be routed to port 8080 in a random pod with the label app:
nginx.

A. No
B. Yes

Answer: A

Explanation:
The statement is not entirely correct. In Kubernetes, a service of type ClusterIP routes traffic sent to its IP address to the pods selected by its label selector1. However, the port to which the traffic is routed in the pod is determined by the targetPort specified in the service definition1. If targetPort is not specified, it defaults to being the same as the port field1. In the provided YAML snippet, there is no targetPort specified for port 80, so we cannot confirm that the traffic will be routed to port 8080 in the pod. Therefore, without additional information about the pod configuration, we cannot verify the provided solution statement1.

NEW QUESTION # 120
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: accounting and limiting of resources

A. No
B. Yes

Answer: B

Explanation:
Explanation
= Control Groups (cgroups) are a feature of the Linux kernel that allow you to limit the access processes and containers have to system resources such as CPU, memory, disk I/O, network, and so on1. Control groups allow Docker Engine to share available hardware resources to containers and optionally enforce limits and constraints2. For example, you can use the docker run command to specify the CPU shares, memory limit, or network bandwidth for a container3. By using cgroups, you can ensure that each container gets the resources it needs and prevent resource starvation or overcommitment4. References:
* Lab: Control Groups (cgroups) | dockerlabs
* Runtime metrics | Docker Docs
* Docker run reference | Docker Docs
* Docker resource management via Cgroups and systemd

NEW QUESTION # 121
......

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