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data link layer
This term is a technical specification within the OSI model, specifically referring to Layer 2. It operates between the physical layer and the network layer, focusing on the reliable transmission of data frames between two directly connected nodes.
In professional networking contexts, this layer is often discussed in terms of MAC (Media Access Control) and LLC (Logical Link Control) sublayers. It is a highly specialized term used almost exclusively in computer science, telecommunications, and network engineering.