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The DCA Certification program is open to anyone who is interested in becoming a certified Docker professional. The program is ideal for IT professionals, developers, and system administrators who want to enhance their Docker knowledge and skills. Docker Certified Associate (DCA) Exam certification exam measures a candidate's ability to perform tasks related to Docker installation, configuration, and management.

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Docker Certified Associate (DCA) Exam Sample Questions (Q35-Q40):

NEW QUESTION # 35
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. No
B. Yes

Answer: A

Explanation:
The command docker service create -name dns-cache -p 53:53 -service udp dns-cache is not valid because it has some syntax errors. The correct syntax for creating a swarm service is docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]. The errors in the command are:
There should be a space between the option flag and the option value. For example, -name dns-cache should be -name dns-cache.
The option flag for specifying the service mode is -mode, not -service. For example, -service udp should be -mode udp.
The option flag for specifying the port mapping is --publish or -p, not -p. For example, -p 53:53 should 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 called dns-cache that uses the dns-cache image and exposes port 53 on both the host and the container using the UDP protocol.
[docker service create | Docker Documentation] : [Publish ports for services | Docker Documentation]

NEW QUESTION # 36
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:
The user namespace is a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used. The user namespace allows the host system to map its own uid and gid to some different uid and gid for containers' processes. This improves the security of Docker by isolating the user and group ID number spaces, so that a process's user and group ID can be different inside and outside of a user namespace1. To enable the user namespace, the daemon must start with --userns-remap flag with a parameter that specifies base uid/gid2. All containers are run with the same mapping range according to /etc/subuid and /etc/subgid3. References:
* Isolate containers with a user namespace
* Using User Namespaces on Docker
* Docker 1.10 Security Features, Part 3: User Namespace

NEW QUESTION # 37
Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?
Solution: A default provisioner is specified, and subsequently a persistentVolumeClaim is created.

A. No
B. Yes

Answer: A

Explanation:
= The conditions are not sufficient for Kubernetes to dynamically provision a persistentVolume, because they are missing a StorageClass object. A StorageClass object defines which provisioner should be used and what parameters should be passed to that provisioner when dynamic provisioning is invoked. A persistentVolumeClaim must specify the name of a StorageClass in its storageClassName field to request a dynamically provisioned persistentVolume. Without a StorageClass, Kubernetes cannot determine how to provision the storage for the claim. References:
* Dynamic Volume Provisioning | Kubernetes
* Persistent volumes and dynamic provisioning | Google Kubernetes Engine ...
* Dynamic Provisioning and Storage Classes in Kubernetes or Dynamic Provisioning and Storage Classes in Kubernetes

NEW QUESTION # 38
Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?
Solution: A default storageClass is specified, and subsequently a persistentVolumeClaim is created.

A. No
B. Yes

Answer: B

Explanation:
= The conditions are sufficient for Kubernetes to dynamically provision a persistentVolume, because they include a default storageClass and a persistentVolumeClaim. A storageClass defines which provisioner should be used and what parameters should be passed to that provisioner when dynamic provisioning is invoked. A persistentVolumeClaim requests a specific size, access mode, and storageClass for the persistentVolume. If a persistentVolume that satisfies the claim exists or can be provisioned, the persistentVolumeClaim is bound to that persistentVolume. A default storageClass means that any persistentVolumeClaim that does not specify a storageClass will use the default one. Therefore, the conditions in the question are enough to enable dynamic provisioning of storage volumes on-demand. Reference:
Dynamic Volume Provisioning | Kubernetes
Persistent volumes and dynamic provisioning | Google Kubernetes Engine ...

NEW QUESTION # 39
Is this a supported user authentication method for Universal Control Plane?
Solution.LDAP

A. No
B. Yes

Answer: B

Explanation:
Explanation
= LDAP is a supported user authentication method for Universal Control Plane (UCP). UCP has its own built-in authentication mechanism and integrates with LDAP and Active Directory. It also supports Role Based Access Control (RBAC) and Docker ContentTrust. UCP allows you to configure LDAP as an authentication method and connect it to your LDAP server. You need to provide the LDAP URL, the base DN, the bind DN and password, and the user and group search settings12. References:
* SAML | Docker Docs
* Universal Control Plane overview | dockerlabs

NEW QUESTION # 40
......

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