Docker Certified Associate Certification Training Course - Overlay Network

The video tutorial explains the concept of Docker overlay networks, which create distributed networks among multiple Docker hosts. These networks enable secure communication between containers, especially when encryption is enabled. Overlay networks are useful for connecting swarm services and standalone containers across different Docker hosts. The tutorial also covers how to create user-defined overlay networks and discusses configuration concerns. A practical example illustrates the setup of a pets overlay network connecting containers on different hosts.

What is the primary function of the overlay network driver in Docker?

• To create isolated networks for each container

• To manage storage for Docker containers

• To provide a user interface for Docker management

• To enable secure communication between containers across multiple hosts

How can overlay networks facilitate communication in Docker?

• By enabling communication between swarm services and standalone containers across different hosts

• By providing a graphical interface for network management

• By isolating networks to prevent any communication

• By connecting only standalone containers on the same host

What command is used to create a user-defined overlay network in Docker?

• docker network create

• docker container run

• docker service create

• docker network inspect

In the provided diagram, which port is the web container available on?

• Port 3000

• Port 8000

• Port 443

• Port 8080

What is the role of the pets overlay network in the example?

• To manage storage for the DB container

• To isolate the DB container from the web container

• To connect the DB container and web container across different hosts

• To provide a backup for the web container