Docker Network Overview

Image reference from [1]

When you install Docker, it creates three networks automatically. You can list these networks using the docker network ls command:

$ docker network ls
NETWORK ID          NAME                DRIVER
32b93b141bae        bridge              bridge
c363d9a92877        host                host
88077db743a8        none                null

Reference

[1]	https://blog.docker.com/2015/04/docker-networking-takes-a-step-in-the-right-direction-2/