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Docker Certification
DCA Exam
Docker.DCA.v2023-09-25.q118 Dumps

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Question 11

In the context of a swarm mode cluster, does this describe a node?
Solution: a virtual machine participating in the swarm

A.Yes
B.No

Correct Answer: A

Explanation
A virtual machine participating in the swarm is a node in the context of a swarm mode cluster. A node is an instance of the Docker engine participating in the swarm. A node can be either a physical machine or a virtual machine. Nodes are either managers or workers. Managers maintain cluster state and manage cluster tasks.
Workers execute tasks assigned by managers. References:
https://docs.docker.com/engine/swarm/key-concepts/#nodes-and-services,
https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/

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Question 12

In the context of a swarm mode cluster, does this describe a node?
Solution. an instance of the Docker CLI connected to the swarm

A.Yes
B.No

Correct Answer: B

Explanation
An instance of the Docker CLI connected to the swarm does not describe a node in the context of a swarm mode cluster. A node is a physical or virtual machine that runs the Docker Engine and participates in the swarm. A node can have one of two roles: manager or worker. Manager nodes maintain the cluster state and orchestrate tasks. Worker nodes execute tasks assigned by manager nodes. An instance of the Docker CLI connected to the swarm is a client that can interact with the swarm using commands such as docker service, docker node, docker stack, etc. A client can connect to any manager node in the swarm using the --host or -H flag. References: https://docs.docker.com/engine/swarm/key-concepts/#nodes-and-services,
https://docs.docker.com/engine/swarm/swarm-tutorial/#use-docker-for-mac-or-docker-for-windows

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Question 13

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.Yes
B.No

Correct Answer: B

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/

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Question 14

Wha is the purpose of Docker Content Trust?

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

Correct Answer: B

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Question 15

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
C.32
D.64 for every service routing to pods on this node

Correct Answer: D

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