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Latest DCA Exam Duration | Reliable DCA Exam Bootcamp

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Docker Certified Associate (DCA) Exam Sample Questions (Q188-Q193):

NEW QUESTION # 188
Will a DTR security scan detect this?
Solution.private keys copied to the image

A. Yes
B. No

Answer: A

Explanation:
= A DTR security scan will detect private keys copied to the image. DTR security scan is a feature of Docker Trusted Registry (DTR) that scans images to detect any security vulnerability1. DTR security scan uses the open source tool SecretScanner2 to find unprotected secrets in container images or file systems. SecretScanner can match the contents of images against a database of approximately 140 secret types, including private keys3. Therefore, if an image contains private keys, DTR security scan will report them as potential secrets and alert the user to remove them from the image. Reference:
Scan images for vulnerabilities | Docker Docs
GitHub - deepfence/SecretScanner: :unlock: Find secrets and passwords ...
SecretScanner/deepfence_secret_scanner.py at main * deepfence/SecretScanner

NEW QUESTION # 189
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 4-2-1

A. Yes
B. No

Answer: B

Explanation:
= This is not how the seven managers should be distributed across three datacenters or availability zones. A swarm cluster is a group of Docker hosts that are running in swarm mode and act as managers or workers1. A manager node is responsible for maintainingthe swarm state and orchestrating the services2. A swarm cluster needs a quorum of managers to operate, which means a majority of managers must be available and able to communicate with each other3.
The problem with distributing the seven managers as 4-2-1 is that it creates a split-brain scenario, where the cluster can lose the quorum if one datacenter or availability zone fails. For example, if the datacenter with four managers goes down, the remaining three managers will not have enough votes to form a quorum, and the cluster will stop functioning. Similarly, if the datacenter with one manager goes down, the cluster will lose the tie-breaking vote and will not be able to elect a leader4.
A better way to distribute the seven managers across three datacenters or availability zones is to use 3-2-2, which ensures that the cluster can tolerate the failure of any one datacenter or availability zone and still maintain the quorum. For example, if the datacenter with three managers goes down, the remaining four managers will have enough votes to form a quorum and elect a leader. Similarly, if the datacenter with two managers goes down, the remaining five managers will have enough votes to form a quorum and elect a leader4. Reference:
Swarm mode overview | Docker Docs
Administer and maintain a swarm of Docker Engines | Docker Docs
Raft consensus in swarm mode | Docker Docs
Docker Swarm: How to distribute managers across availability zones? - Stack Overflow

NEW QUESTION # 190
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. Yes
B. No

Answer: A

Explanation:
Explanation
The networkPolicy shown in the image is designed to block traffic from pods lacking the tier: api label, to pods bearing the tier: backend label. This is because the policy is set to matchLabels: tier: backend, and the ingress is set to - from: podSelector: matchLabels: tier: api. Therefore, any traffic that does not match these labels will be blocked.
References:
* Isolate containers with a user namespace | Docker Docs
* The mnt namespace - Docker Cookbook - Second Edition
* Container security fundamentals part 2: Isolation & namespaces
I hope this helps you understand the concept of networkPolicy and how it works with Kubernetes. If you have any other questions related to Docker, please feel free to ask me.

NEW QUESTION # 191
Wha is the purpose of Docker Content Trust?

A. Docker registry TLS verification and encryption
B. Signing and verification of image tags
C. Enabling mutual TLS between the Docker client and server
D. Indicating an image on Docker Hub is an official image

Answer: B

NEW QUESTION # 192
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: role-based access control to clustered resources

A. Yes
B. No

Answer: B

NEW QUESTION # 193
......

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