In which scenario would a unicast address be used?

A unicast address is specifically designed for communication between a single sender and a single recipient. In the context of networking, when data is sent using a unicast address, it means that the information is directed to one specific device on the network, ensuring that only that device receives the data being transmitted.

This is particularly useful in scenarios where individual communication is required, such as when a user is retrieving files from a server or when sending a message between two computers. The point-to-point nature of unicast communication minimizes network congestion, as the data packets are not broadcast to all devices but instead follow a direct path to the intended recipient.

The other options involve communication methods that target multiple devices, either simultaneously or in a range. Broadcasting sends data to all devices on a network, while communicating with a range of devices involves multicast addressing, where data is sent to a specific group of devices rather than an individual. Therefore, the use of a unicast address is distinct and focused solely on one-to-one communication.