DCA Docker Networking Flashcards

What is the default network driver used when you create a container without specifying a network?

Answer: bridge

Docker uses the bridge network driver by default when no network is specified at container creation.

Which Docker network driver allows containers on different Docker hosts to communicate?

Answer: overlay

The overlay network driver enables communication between containers across multiple Docker hosts in a Swarm cluster.

What command creates a user-defined bridge network named 'my-network'?

Answer: docker network create --driver bridge my-network

The `docker network create --driver bridge my-network` command creates a user-defined bridge network.

Which port publishing flag maps host port 8080 to container port 80?

Answer: -p 8080:80

The `-p 8080:80` flag maps host port 8080 to container port 80 using the host:container format.

What does the `--network host` flag do when running a container?

Answer: Shares the host's network namespace with the container

The `--network host` flag removes network isolation between the container and the Docker host.

Which command displays all Docker networks on a host?

Answer: docker network ls

The `docker network ls` command lists all networks available on the Docker host.