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Docker Certified Associate (DCA) Exam Sample Questions (Q143-Q148):

NEW QUESTION # 143
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker network create -d overlay -o encrypted=true <network-name>

A. Yes
B. No

Answer: A

Explanation:
Explanation
The command docker network create -d overlay -o encrypted=true <network-name> will ensure that overlay traffic between service tasks is encrypted. This command creates an overlay network with the encryption option enabled, which means that Docker will create IPSEC tunnels between all the nodes where tasks are scheduled for services attached to the overlay network. These tunnels use the AES algorithm in GCM mode and manager nodes automatically rotate the keys every 12 hours1. This way, the data exchanged between containers on different nodes on the overlay network is secured. References:
* Overlay network driver

NEW QUESTION # 144
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

Answer: B

Explanation:
Explanation
The statement does not describe a node in the context of a swarm mode cluster. A node is a physical or virtual machine running Docker Engine 1.12 or later in swarm mode1. An instance of the Docker CLI connected to the swarm is not a node, but a client that can interact with the swarm through the Docker API2. The Docker CLI can be used to create a swarm, join nodes to a swarm, deploy services to a swarm, and manage swarm behavior3. References: How nodes work), Docker CLI), Swarm mode overview)

NEW QUESTION # 145
During development of an application meant to be orchestrated by Kubernetes, you want to mount the /data directory on your laptop into a container.
Will this strategy successfully accomplish this?
Solution: Add a volume to the pod that sets hostPath.path: /data, and then mount this volume into the pod's containers as desired.

A. Yes
B. No

Answer: A

Explanation:
Explanation
Adding a volume to the pod that sets hostPath.path: /data, and then mounting this volume into the pod's containers as desired is a strategy that successfully accomplishes this. A hostPath volume mounts a file or directory from the host node's filesystem into a pod. It can be used to access files on the host from a container, such as configuration files, logs, binaries, etc. However, this type of volume is not portable across nodes and should be used with caution. References: https://kubernetes.io/docs/concepts/storage/volumes/#hostpath,
https://kubernetes.io/docs/tasks/configure-pod-container/configure-volume-storage/

NEW QUESTION # 146
Your organization has a centralized logging solution, such as Splunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution: Set the log-driver and log-oPt keys to values for the logging solution (Splunk) In the daemon.json file.

A. Yes
B. No

Answer: A

NEW QUESTION # 147
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-2-2

A. Yes
B. No

Answer: B

Explanation:
Explanation
= Distributing seven managers across three datacenters or availability zones as 3-2-2 is not a good way to ensure high availability and fault tolerance. This is because a swarm cluster requires a majority of managers (more than half) to be available and able to communicate with each other in order to maintain the swarm state and avoid a split-brain scenario1. If one of the datacenters or availability zones with three managers goes down, the remaining four managers will not have a quorum and the swarm will stop functioning. A better way to distribute seven managers across three datacenters oravailability zones is 3-3-1 or 3-2-1-1, which will allow the swarm to survive the loss of one or two datacenters or availability zones, respectively2. References:
* Administer and maintain a swarm of Docker Engines | Docker Docs
* How to Create a Cluster of Docker Containers with Docker Swarm and DigitalOcean on Ubuntu 16.04 | DigitalOcean

NEW QUESTION # 148
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