DCA Exam Brain Dumps - Study Notes and Theory [Nov-2021]
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NEW QUESTION 21
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. No
- B. Yes
Answer: A
NEW QUESTION 22
Which of the following commands will create a swarm service which only listens on port 53 using the UDP protocol?
- A. docker service create --name dns-cache -p 53:53 --service udp dns-cache
- B. docker service create --name dns-cache -p 53:53/udp dns-cache
- C. docker service create --name dns-cache -p 53:53 ..constraint
networking.protocol.udp=true dns-cache - D. docker service create --name dns-cache -p 53:53 --udp dns-cache
Answer: B
NEW QUESTION 23
A docker service 'web' is running with a scale factor of 1 (replicas = 1).
Bob intends to use the command 'docker service update --replicas=3 web'.
Alice intends to use the command 'docker service scale web=3'.
How do the outcomes oft these two commands differ?
- A. Bob's command updates the number of replicas of the 'web' service to 3. Alice's command results in an error.
- B. Bob's command only updates the service definition, but no new replicas are started. Alice's command results in the actual scaling up of the 'web' service.
- C. Bob's command results in an error. Alice's command updates the number of replicas of the 'web' service to 3.
- D. Both Bob's and Alice's commands result in exactly the same outcome, which is 3 instances of the 'web' service.
Answer: D
NEW QUESTION 24
You configure a local Docker engine to enforce content trust by setting the environment variable
DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker service create myorg/myimage:1.0
- A. No
- B. Yes
Answer: A
NEW QUESTION 25
Will this command list all nodes in a swarm cluster from the command line?
Solution: 'docker Is -a'
- A. No
- B. Yes
Answer: B
NEW QUESTION 26
The Kubernetes yaml shown below describes a clusterIP service.
Is this a correct statement about how this service routes requests?
Solution: Traffic sent to the IP of any pod with the label app: nginx on port 8080 will be forwarded to port 80 in that pod.
- A. No
- B. Yes
Answer: B
NEW QUESTION 27
Following the principle of least privilege, which of the following methods can be used to securely grnt access to the specific user to communicate to a Docker engine? (Choose two.)
- A. Add the user to the 'docker' group on the server or specify the groue with the '--group' Docker daemon option.
- B. Utilize openssl to create TLS client and server certificates, configuring the Docker engine to use with mutual TLS over TCP.
- C. Utilize the '--host 0.0.0.0:2375' option to the Docker daemon to listen on port 2375 over TCP on all interfaces
- D. Give the user root access to the server to allow them to run Docker commands as root.
- E. Utilize the '--host 127.0.0.1:2375' option to the Docker daemon to listen on port 2375 over TCP on localhost
Answer: A,B
NEW QUESTION 28
Which networking drivers allow you to enable multi-host network connectivity between containers?
- A. macvlan, ipvlan, and overlay
- B. bridge, macvlan, ipvlan, overlay
- C. bridge, user-defined, host
- D. host, macvlan, overlay, user-defined
Answer: A
NEW QUESTION 29
Which statement is true?
- A. ENTRYPOINT cannot be overriden in the "docker container run" command
- B. ENTRYPOINT cannot be used in conjuction with CMD
- C. CMD is used to run the software is the image along with any arguments
- D. CMD shell format uses this form ["param", param", "param"]
Answer: D
NEW QUESTION 30
Will this command display a list of volumes for a specific container?
Solution: 'docker container inspect nginx'
- A. No
- B. Yes
Answer: B
NEW QUESTION 31
Which of the following commands will ensure that overlay traffic between service tasks is encrypted?
- A. docker service create --network <network-name> --secure <service-name>
- B. docker network create -d overlay -o encrypted=true <network-name>
- C. docker network create -d overlay --secure <network-name>
- D. docker service create --network <network-name> --encrypted <service-name>
Answer: B
NEW QUESTION 32
Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 3-3-1
- A. No
- B. Yes
Answer: A
NEW QUESTION 33
The following Docker Compose file is deployed as a stack:
Is this statement correct about this health check definition?
Solution: Health checks test for app health ten seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.
- A. No
- B. Yes
Answer: A
NEW QUESTION 34
Which of the following constitutes a production-ready devicemapper configuration for the Docker engine?
- A. Format a partition with xfs and mount it at '/var/lib/docker'
- B. Create a volume group in devicemapper and utilize the '--dm.thinpooldev' Docker daemon
option, specifying the volume group - C. Nothing, devicemapper comes ready for production usage out of the box
- D. Utilize the '--storage-opt dm.directlvm_device' Docker daemon option, specifying a block
device
Answer: D
NEW QUESTION 35
Which of the following commands starts a Redis container and configures it to always restart unless it is
explicitly stopped or Docker is restarted?
- A. 'docker run -d --restart omit-stopped redis'
- B. 'docker run -d --failure omit-stopped redis'
- C. 'docker run -d --restart unless-stopped redis'
- D. 'docker run -d --restart-policy unless-stopped redis'
Answer: C
NEW QUESTION 36
You set up an automatic pruning policy on a DTR repository to prune all images using Apache licenses. What effect does this have on images in this repository?
- A. Matching images are untagged during the next prune job, and subsequently deleted once they are older than the pruning threshold set in the repository's Settings tab.
- B. Matching images are untagged once they are older than the pruning threshold set in the repository's Settings tab.
- C. Matching images are deleted during the next prune Job.
- D. Matching Images are untagged during the next prune job.
Answer: B
NEW QUESTION 37
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. No
- B. Yes
Answer: B
NEW QUESTION 38
Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?
Solution: net
- A. No
- B. Yes
Answer: A
NEW QUESTION 39
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods --all-namespaces -I env=development'
- A. No
- B. Yes
Answer: B
NEW QUESTION 40
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution: docker service create --network --encrypted
- A. No
- B. Yes
Answer: A
NEW QUESTION 41
You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution: 'docker inspect http'
- A. No
- B. Yes
Answer: A
NEW QUESTION 42
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