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NEW QUESTION # 27
In Docker Trusted Registry, how would a user prevent an image, for example 'nginx:latest' from being
overwritten by another user with push access to the repository?
Answer: A
NEW QUESTION # 28
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"
Answer: B
Explanation:
The command docker service create -name dns-cache -p 53:53 -constraint networking.protocol.udp=true dns-cache will not create a swarm service that only listens on port 53 using the UDP protocol. This command has several syntax errors and invalid options. The correct syntax for creating a swarm service is docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]1. The correct options for specifying the service name, port mapping, and network mode are --name, --publish, and --network respectively1. The option -constraint is not a valid option for the docker service create command. To create a swarm service that only listens on port
53 using the UDP protocol, you need to use the --publish option with
the protocol=udp and mode=host parameters, and the --network option with the host value23. For example, the following command creates a global service using host mode and bypassing the routing mesh2:
docker service create --name dns-cache
--publish published=53,target=53,protocol=udp,mode=host
--mode global
--network host
dns-cache
References:
* 1: docker service create | Docker Docs
* 2: Use swarm mode routing mesh | Docker Docs
* 3: Manage swarm service networks | Docker Docs
NEW QUESTION # 29
Is this the purpose of Docker Content Trust?
Solution.Indicate an image on Docker Hub is an official image.
Answer: B
Explanation:
Explanation
The purpose of Docker Content Trust is not to indicate an image on Docker Hub is an official image. Docker Content Trust is a feature that allows users to verify the integrity and publisher of container images they pull or deploy from a registry server, signed on a Notary server1. Docker Content Trust uses digital signatures to ensure that the images are authentic and have not been tampered with2. Official images are a curated set of Docker repositories that are designed to be the best starting point for most users3. They are not necessarily signed by Docker Content Trust, although some of them are. To indicate an image on Docker Hub is an official image, you can look for the blue "official image" badge on the image page. References:
* Content trust in Docker | Docker Docs
* Docker Content Trust: What It Is and How It Secures Container Images
* Official Images on Docker Hub | Docker Docs
* [Docker Hub Quickstart | Docker Docs]
NEW QUESTION # 30
A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster.
Can this be used to schedule containers to meet the security policy requirements?
Solution: resource reservation
Answer: B
NEW QUESTION # 31
You want to create a container that is reachable from its host's network.
Does this action accomplish this?
Solution. Use network connect to access the container on the bridge network.
Answer: B
Explanation:
Explanation
Using network connect to access the container on the bridge network does create a container that is reachable from its host's network. The network connect command connects a running container to another network. By default, Docker creates and connects containers to a bridge network, which is an internal network that isolates containers from each other and from the host. However, you can use network connect to connect a container to another network, such as the host network, which allows the container to share the host's network stack and be reachable from the host's network. References:
https://docs.docker.com/engine/reference/commandline/network_connect/,
https://docs.docker.com/network/bridge/, https://docs.docker.com/network/host/
NEW QUESTION # 32
......
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