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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
Does this command create a swarm service that only listens on port 53 using the UDP protocol? Solution. 'docker service create -name dns-cache -p 53:53 -constraint networking.protocol.udp=true dns-cache'
Is this a supported user authentication method for Universal Control Plane? Solution. x.500
Will this command display a list of volumes for a specific container? Solution. 'docker container logs nginx --volumes'
Is this a way to configure the Docker engine to use a registry without a trusted TLS certificate? Solution. Set INSECURE_REGISTRY in the' /etc/docker/default' configuration file.
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 this service on port 8080 will be routed to port 80 in a random pod with the label aPP: nginx.
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?
Will this command list all nodes in a swarm cluster from the command line? Solution. 'docker inspect nodes
A user's attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation? Solution. SELinux
Will this command display a list of volumes for a specific container? Solution: docker volume inspect nginx'

Question 46 - DCA discussion

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Does this command create a swarm service that only listens on port 53 using the UDP protocol?

Solution: 'docker service create -name dns-cache -p 53:53 -service udp dns-cache'

A.

Yes

Answers
A.

Yes

B.

No

Answers
B.

No

Suggested answer: B

Explanation:

The commanddocker service create -name dns-cache -p 53:53 -service udp dns-cacheisnot validbecause it has somesyntax errors. The correct syntax for creating a swarm service isdocker service create [OPTIONS] IMAGE [COMMAND] [ARG...]. The errors in the command are:

There should be a space between theoption flagand theoption value. For example,-name dns-cacheshould be-name dns-cache.

The option flag for specifying theservice modeis-mode, not-service. For example,-service udpshould be-mode udp.

The option flag for specifying theport mappingis--publishor-p, not-p. For example,-p 53:53should be--publish 53:53.

The correct command for creating a swarm service that only listens on port 53 using the UDP protocol is:

docker service create --name dns-cache --publish 53:53/udp dns-cache

This command will create a service calleddns-cachethat uses thedns-cacheimage and exposes port 53 on both the host and the container using the UDP protocol.

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asked 08/11/2024
Maher Khamessi
30 questions
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