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Docker Certified Associate (DCA) Exam Sample Questions (Q164-Q169):

NEW QUESTION # 164
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution.Run docker engine activate.

A. No
B. Yes

Answer: B

Explanation:
Running docker engine activate will upgrade Docker Engine CE to Docker Engine EE. This is a feature that allows you to switch from the Community Edition to the Enterprise Edition without reinstalling Docker or losing any data. You need to have a valid license file and a subscription to Docker EE to use this feature1. Docker EE is a premium version of Docker CE that offers additional features, such as security scanning, image management, and certified plugins23. Reference:
Upgrade Docker Engine | Docker Docs
What is the exact difference between Docker EE (Enterprise Edition), Docker CE (Community Edition) and Docker (Custom Support) - Stack Overflow Docker Community Edition or Docker Enterprise Edition - Docker | BoxBoat

NEW QUESTION # 165
In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository?
Solution: Tag the image with 'nginx:immutable'.

A. Yes
B. No

Answer: B

Explanation:
Explanation
Tagging the image with 'nginx:immutable' is not how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository. Tagging the image with
'nginx:immutable' will only create a new tag for the image, but it will not prevent the original tag from being overwritten. To prevent an image tag from being overwritten in Docker Trusted Registry, the user can use the DTR web UI to make the tag immutable1. This will prevent anyone from pushing a new image with the same tag, even if they have push access to the repository1. Alternatively, the user can also use the DTR API to make the tag immutable2. References: Prevent tags from being overwritten), DTR API reference)

NEW QUESTION # 166
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use --link to access the container on the bridge network.

A. Yes
B. No

Answer: B

Explanation:
= The action of using --link to access the container on the bridge network does not accomplish the goal of creating a container that is reachable from its host's network. The --link option allows you to connect containers that are running on the same network, but it does not expose the container's ports to the host1. To create a container that is reachable from its host's network, you need to use the --network host option, which attaches the container to the host's network stack and makes it share the host's IP address2. Alternatively, you can use the --publish or -p option to map the container's ports to the host's ports3.
Legacy container links | Docker Documentation : Networking using the host network | Docker Documentation : docker run reference | Docker Documentation

NEW QUESTION # 167
You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Turn the configuration file into a configMap object, use it to populate a volume associated with the pod, and mount that file from the volume to the appropriate container and path.

A. No
B. Yes

Answer: B

NEW QUESTION # 168
Is this a type of Linux kernel namespace that provides container isolation?
Solution: Storage

A. Yes
B. No

Answer: B

Explanation:
= Storage is not a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources while another set of processes sees a different set of resources1. The feature works by having the same namespace for a set of resources and processes, but those namespaces refer to distinct resources. Since kernel version 5.6, there are 8 kinds of namespaces: mount, UTS, IPC, PID, network, user, cgroup, and time2. Each kind of namespace isolates a different aspect of the system, such as file system mounts, host and domain names, inter-process communication, process IDs, network interfaces, user and group IDs, cgroups, and system time2. Storage is not one of them. References:
* 1: Linux namespaces - Wikipedia
* 2: Namespaces - The Linux Kernel documentation

NEW QUESTION # 169
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