What is the default network mode for Docker containers?

The default network mode for Docker containers is bridge network mode. In this mode, Docker creates a virtual network bridge on the host machine, which allows containers to communicate with each other through virtualized network interfaces. Each container gets its own IP address on this bridge network, facilitating internal communication and allowing them to connect to the outside world through Network Address Translation (NAT).

Bridge network mode provides an isolation layer between the containers and the host network, which enhances security and avoids port conflicts. By default, when you launch a new container without specifying a network mode, it automatically connects to the bridge network created by Docker. This design choice enables a seamless and manageable networking experience for users deploying containers, particularly when they want to run multiple containers without worrying about their networking configurations and how they will interact with one another.

The other options reflect different networking models that can be used based on specific use cases, but they are not employed by default when creating new containers.