Which of the following describes a Docker network?

A Docker network is a system that facilitates communication between containers. In the context of Docker, containers are isolated environments that run applications and services, but they often need to communicate with one another to function correctly. Docker networks enable this by allowing containers to discover each other and exchange data seamlessly.

When containers are connected to the same network, they can communicate using their container names, making it easy to set up multi-container applications without needing to hard-code IP addresses or ports. This is particularly useful in microservices architectures where different services (running in separate containers) need to interact with each other.

The other options do not accurately describe the function of a Docker network. Accessing external servers goes beyond just inter-container communication and involves routing through the host machine or the Internet, which is not the primary role of a Docker network. Aggregating log files refers to a different concept entirely, which is related to log management rather than network communication. Lastly, while Docker can use networks to facilitate temporary communication, it does not eliminate the need for persistent storage, as that pertains to data retention rather than networking functionality.