DCA TEST ANSWERS | NEW DCA TEST LABS

DCA Test Answers | New DCA Test Labs

DCA Test Answers | New DCA Test Labs

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The DCA exam is designed for professionals who are involved in software development, IT operations, and DevOps. DCA exam covers a wide range of topics, including Docker architecture, Docker installation and configuration, Docker networking, Docker security, Docker images and containers, Docker orchestration, and Docker storage. Candidates who pass the DCA Exam are able to demonstrate their proficiency in all these areas.

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We have authoritative production team made up by thousands of experts helping you get hang of our Docker Certified Associate (DCA) Exam study question and enjoy the high quality study experience. We will update the content of DCA test guide from time to time according to recent changes of examination outline and current policies, so that every examiner can be well-focused and complete the exam focus in the shortest time. Besides, our DCA Exam Questions can help you optimize your learning method by simplifying obscure concepts so that you can master better. One more to mention, with our DCA test guide, there is no doubt that you can cut down your preparing time in 20-30 hours of practice before you take the exam.

Docker Certified Associate (DCA) Exam Sample Questions (Q151-Q156):

NEW QUESTION # 151
The following health check exists in a Dockerfile:
'HEALTCHECK CMD curl --fail http://localhost/health || exit 1'
Which of the following describes its purpose?

  • A. Defines the action taken when container health fails, which in this case will kill the container with exit status 1
  • B. Defines the health check endpoint on the localhost interface for external monitoring tools to monitor the health of the docker engine.
  • C. Defines the health check for the containerized application so that the application health can be monitored by the Docker engine
  • D. Defines the health check endpoint on the local host interface for containers to monitor the health of the docker engine.

Answer: A


NEW QUESTION # 152
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: node taints

  • A. Yes
  • B. No

Answer: A

Explanation:
Node taints are a way to mark nodes in a Swarm cluster so that they can repel or attract certain containers based on their tolerations. By applying node taints to the nodes that are designated for development or production, the company can ensure that only the containers that have the matching tolerations can be scheduled on those nodes. This way, the security policy requirements can be met. Node taints are expressed as key=value:effect, where the effect can be NoSchedule, PreferNoSchedule, or NoExecute. For example, to taint a node for development only, one can run:
kubectl taint nodes node1 env=dev:NoSchedule
This means that no container will be able to schedule onto node1 unless it has a toleration for the taint env=dev:NoSchedule. To add a toleration to a container, one can specify it in the PodSpec. For example:
tolerations:
- key: "env"
operator: "Equal"
value: "dev"
effect: "NoSchedule"
This toleration matches the taint on node1 and allows the container to be scheduled on it. References:
* Taints and Tolerations | Kubernetes
* Update the taints on one or more nodes in Kubernetes
* A Complete Guide to Kubernetes Taints & Tolerations


NEW QUESTION # 153
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use network attach to access the containers on the bridge network

  • A. No
  • B. Yes

Answer: A


NEW QUESTION # 154
The Kubernetes yaml shown below describes a networkPolicy.

Will the networkPolicy BLOCK this trafftc?
Solution. a request issued from a pod bearing the tier: backend label, to a podbearing the tier: frontend label

  • A. Yes
  • B. No

Answer: A

Explanation:
The networkPolicy will block the traffic from a pod bearing the tier: backend label, to a pod bearing the tier: frontend label. The networkPolicy specifies that only pods with the tier: frontend label can access the pods with the app: guestbook-api and tier: backend labels on port 801. Any other traffic to the backend pods will be denied by default2. Therefore, a request issued from a pod bearing the tier: backend label, to a pod bearing the tier: frontend label will be blocked by the networkPolicy. Reference: Connect a Frontend to a Backend Using Services), Network Policies)


NEW QUESTION # 155
Will a DTR security scan detect this?
Solution.image configuration poor practices, such as exposed ports or inclusion of compilers in production images

  • A. No
  • B. Yes

Answer: A

Explanation:
Explanation
A DTR security scan will not detect image configuration poor practices, such as exposed ports or inclusion of compilers in production images. A DTR security scan is designed to discover vulnerabilities in the images based on the MITRE CVE or NIST NVD databases1. It does not check the image configuration or best practices. To check the image configuration and best practices, you can use other tools, such as Dockerfile Linter) or Docker Bench for Security). References: Vulnerability scanning must be enabled for all repositories in the Docker Trusted Registry (DTR) component of Docker Enterprise), Dockerfile Linter), Docker Bench for Security)


NEW QUESTION # 156
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