Which of the following techniques is NOT one of the basic methods used by different layers of protocols to work together?

Segmentation is specifically a process used to divide large packets into smaller units for efficient transmission across a network. While it is a relevant concept in network communication, it is not classified as a basic method for enabling the cooperation of different layers of protocols.

On the other hand, encapsulation is crucial as it allows a higher layer of protocols to wrap its data packets in the format expected by the layer below, enabling seamless communication across the layers. Decapsulation refers to the reverse process, where the data is extracted from the encapsulation by the receiving protocol layer, making it equally essential for protocol interaction. Reassembly is necessary for putting together the smaller packets or segments back into their original form once they reach their destination, ensuring data integrity.

Thus, while segmentation plays a role in the network layers, it does not function as a foundational method for protocols to work together, distinguishing it from the other techniques mentioned.