Which one of the following uses one-to-one transmission from one point in the network to another?

Unicast is a type of communication where data is sent from one specific source to one specific destination. This means that there is a direct, dedicated connection between the two endpoints, allowing the data to be transmitted solely to the intended receiver. This one-to-one relationship is a fundamental characteristic of unicast communication, making it essential for applications where individual data streams are necessary, such as in video calls or dedicated server-client architectures.

In contrast, broadcast sends data to all possible recipients in a network segment, while multicast targets a group of users, allowing for more efficient data transmission to multiple endpoints without overwhelming the network. Anycast allows data to be sent to the nearest or best destination from a set of potential receivers, typically involving routing protocols that determine the optimal path. Each of these methods addresses different networking needs, but unicast remains uniquely positioned as the method that facilitates direct one-to-one communication. Understanding unicast is crucial as it is extensively utilized in many real-world applications and protocols.