Which of the following best describes a subnet in networking?

A subnet, short for subnetwork, is a logical division of a larger network. This concept allows network administrators to segment a larger network into smaller, manageable parts. Subnetting improves performance and security by isolating different segments within a network, making it easier to manage data flow and apply access controls. By using unique subnet addresses, devices within each subgroup can communicate internally while still being part of the overall larger network.

Each subnet can also have its own set of rules related to IP address assignment, routing, and security policies, which enhances network efficiency and reduces congestion. Hence, describing a subnet as a logical division of a larger network is a precise characterization of its function and purpose in network design and operation.