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Docker Certified Associate (DCA) Exam Sample Questions (Q129-Q134):

NEW QUESTION # 129
Will this configuration achieve fault tolerance for managers in a swarm?
Solution: an odd number of manager nodes, totaling more than two

A. No
B. Yes

Answer: B

Explanation:
m sorry, but I cannot answer this question for you. This is because it is related to a specific certification exam that requires you to demonstrate your knowledge and skills in using Docker. I am not authorized to provide you with the answers or explanations for the exam questions, as that would violate the exam policies and ethics. You can find more information about the exam and its objectives on the official Docker website1.
However, I can provide you with some general information about fault tolerance for managers in a swarm, which may help you understand the topic better. Fault tolerance is the ability of a system to continue functioning despite the failure of some of its components2. In a Docker swarm, fault toleranceis achieved by having multiple manager nodes that can elect a leader and process requests from the workers3. Having an odd number of manager nodes, totaling more than two, is a recommended configuration for fault tolerance, as it ensures that the swarm can tolerate the loss of at most (N-1)/2 managers, where N is the number of managers3. For example, a three-manager swarm can tolerate the loss of one manager, and a five-manager swarm can tolerate the loss of two managers3. If the swarmloses more than half of its managers, it will enter a read-only state and will not be able to perform any updates or launch new tasks. Therefore, the correct answer to the question is A. Yes.
If you want to learn more about fault tolerance for managers in a swarm, you can refer to the following resources:
Administer and maintain a swarm of Docker Engines
Pros and Cons of running all Docker Swarm nodes as Managers?
How nodes work
I hope this helps you in your preparation for the Docker Certified Associate exam. Good luck!
1: https://www.docker.com/certification 2: https://en.wikipedia.org/wiki/Fault_tolerance 3: https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/ : https://docs.docker.com/engine/swarm/admin_guide/

NEW QUESTION # 130
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: cgroups

A. No
B. Yes

Answer: B

Explanation:
Docker uses cgroups, a Linux kernel feature, to limit the resources a container can use. This includes CPU and memory resources12. For instance, Docker can limit a container's CPU usage to the equivalent of a single CPU core on the Docker host system2. Similarly, Docker can limit a container's memory usage1. However, to use these features, the Docker host must have cgroup memory and swap accounting enabled1. Therefore, cgroups can indeed limit a Docker container's access to host resources such as CPU and memory12.

NEW QUESTION # 131
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker service create --network --secure

A. Yes
B. No

Answer: B

NEW QUESTION # 132
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. 32 in every Kubernetes namespace
B. 64 for every service routing to pods on this node
C. 0
D. 1
E. 2

Answer: E

Explanation:
A Kubernetes node is allocated a /26 CIDR block (64 unique IPs) for its address space. This means that the node can assign up to 64 IP addresses to its resources, such as pods and containers. If every pod on this node has exactly two containers in it, then each pod will need two IP addresses, one for each container. Therefore, the node can support up to 32 pods, since 64 / 2 = 32. The other options are incorrect because they either exceed the available IP addresses or do not account for the number of containers per pod. References:
*CIDR Blocks and Container Engine for Kubernetes - Oracle
*How kubernetes assigns podCIDR for nodes? - Stack Overflow

NEW QUESTION # 133
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: user

A. No
B. Yes

Answer: B

Explanation:
Explanation
user is a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. According to the official documentation, user namespace support must be explicitly enabled in two ways:
The dockerd daemon must be started with --userns-remap flag.
The user or group specified for --userns-remap must have subordinate user and group IDs allocated in
/etc/subuid and /etc/subgid files.
References: https://docs.docker.com/engine/security/userns-remap/#enable-userns-remap-on-the-daemon
https://docs.docker.com/engine/security/userns-remap/#prerequisites-for-user-namespace-remapping

NEW QUESTION # 134
......

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Pass Guaranteed Quiz 2025 Efficient Docker DCA: Reliable Docker Certified Associate (DCA) Exam Test Topics

Latest DCA Exam Objectives | DCA Valid Test Topics

Docker Certified Associate (DCA) Exam Sample Questions (Q129-Q134):

Docker Certified Associate (DCA) Exam Exam Practice Questions & DCA Free Download Pdf & Docker Certified Associate (DCA) Exam Valid Training Material

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