Understanding UNA, which stands for Upstream Neighbor's Address can shed light on how Token Ring networks operate and how they ensure efficient data transmission. In a Token Ring network, data is transmitted in a circular manner, forming a ring structure. Each network node receives and passes on data frames to its adjacent neighbor, creating a continuous flow of information. Now, the Upstream Neighbor's Address, or UNA, plays a crucial role in this process. It refers to the address of the specific node from which a given node receives frames. The UNA is a unique address assigned to each network node within the Token Ring network. It serves as a vital identifier, ensuring that data frames are correctly routed and delivered to the appropriate destination. With the ring structure of the network, it's important to have a clear understanding of the upstream neighbor from which frames are received, as this information helps maintain the integrity and efficiency of data transmiss