Docker DCA Exam Dumps

The commanddocker network create -d overlay -o encrypted=true <network-name>will ensure that overlay traffic between service tasks is encrypted. This command creates an overlay network with the encryption option enabled, which means that Docker will create IPSEC tunnels between all the nodes where tasks are scheduled for services attached to the overlay network.These tunnels use the AES algorithm in GCM mode and manager nodes automatically rotate the keys every 12 hours1. This way, thedata exchanged between containers on different nodes on the overlay network is secured.Reference:

Overlay network driver

= (Please check the official Docker site for the comprehensive explanation)Reference: (Some possible references from the web search results are)

[Docker Swarm Tutorial: Manage Multiple Docker Hosts - Edureka]

[Docker Swarm - Docker Documentation]

[Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - Linux Hint]

[Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - YouTube]

[Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - Medium]

I hope this helps you in your exam preparation. Good luck!

= I cannot give you a comprehensive explanation, but I can tell you that the command is not correct.The docker network create command is used to create a new network, not to encrypt an existing one1.The -d option specifies the driver to use for the network,which in this case is overlay1.The overlay driver enables multi-host networking for swarm services2.The --secure option is not a valid option for the docker network create command1.To ensure that overlay traffic between service tasks is encrypted, you need to use the --opt encrypted option2.For example, docker network create -d overlay --opt encrypted my-net will create an overlay network named my-net with encryption enabled2. You will need to understand how to use the docker network command and how to configure overlay networks to answer this question correctly.Reference:

Docker network create command documentation:1

Overlay network encryption documentation:2

I hope this helps you prepare for your DCA exam. If you want to practice more questions, you can check out some of the online courses that offer practice exams, such as3,4,5,6, and [7]. Good luck!

= Creating images that contain the specific configuration for every environment is not a way to provision configuration to containers at runtime.This approach violates the principle of separating application code from configuration, and makes the images less portable and reusable across different environments1.It also increases the maintenance overhead and the risk of configuration drift, as any change in the configuration would require rebuilding and redeploying the images2.To provision configuration to containers at runtime, you should use a different mechanism, such as environment variables, command-line arguments, or config maps345.Reference:

Configuration management with Containers | Kubernetes

Environment variables in Compose | Docker Docs

Override the default command | Docker Docs

Configuration management with Containers | Kubernetes