Which type of address signifies one-to-one-of-many communication?

The type of address that signifies one-to-one-of-many communication is anycast. In anycast, a packet is sent from a single source to the nearest member of a group of potential receivers that are identified by the same address. This is particularly useful in applications like content delivery networks and DNS services, where you want a single request to reach the closest server for optimal efficiency.

In contrast, unicast refers to one-to-one communication between a single sender and a single receiver. Multicast is used for one-to-many communication, where one sender sends packets to multiple designated receivers at once. Broadcast sends packets to all devices on a network segment, rather than just to a specific subset. Thus, anycast stands out because it effectively routes data to one of several possible destinations, achieving a balance between unicast and multicast methods.