What is a subnet?

A subnet, or subnetwork, refers to a segment of a larger network that has been divided to enhance performance and security. It consists of a group of local IP addresses that share a common network prefix, making it easier to manage network traffic and control communication within that segment. By creating subnets, network administrators can isolate segments for better organization, efficient traffic routing, and improved security measures.

In terms of digital audio networking, subnets can help in efficiently managing bandwidth and reducing broadcast traffic within a network comprising multiple devices like audio interfaces and mixers connected through protocols such as Dante. This structured approach allows for resilient network designs and easier troubleshooting by compartmentalizing network issues to specific subnets.

While the other options mention different networking concepts, they do not capture the essence of a subnet's function as it relates to a collection of local IP addresses that can communicate with one another within the same network environment.